Graph Clipping: Use Frustum Clipping using AABBox -> Mv transformed Cube -> Frustum mapping + GraphUI Support

AABBox clipping naturally couldn't be transformed into 3D Model-View (Mv) Space,
as it is axis aligned and only provided 2 points (min/max).

Therefor we map the Group's AABBox to a 8-point Cube,
perform the Mv-transformation and then produce the 6-plane Frustum.

As before, we cull fully outside shapes within the Group's draw method
and perform fragment clipping with same Frustum planes in the shader.

With clipping enabled, the 3D z-axis getBounds() depth
will be slightly increased for functional Frustum operation.
This is also done for setFixedSize(Vec2f).

The Frustum planes are copied to the Graph shader
via float[4*6] -> uniform vec4  gcu_ClipFrustum[6]; // L, R, B, T, N, F each {n.x, n.y, n.z, d}

+++

Concludes related work of below commits
- 1040bed4ecc6f4598ea459f1073a9240583fc3c3
- 5cca51e32999a882e2a5f00cb45ecafc824ffd86

17 files changed, 158 insertions, 130 deletions

diff --git a/src/jogl/classes/com/jogamp/graph/curve/opengl/RegionRenderer.java b/src/jogl/classes/com/jogamp/graph/curve/opengl/RegionRenderer.java
index 50fae4907..e9c185753 100644
--- a/src/jogl/classes/com/jogamp/graph/curve/opengl/RegionRenderer.java
+++ b/src/jogl/classes/com/jogamp/graph/curve/opengl/RegionRenderer.java
@@ -48,7 +48,7 @@ import com.jogamp.common.os.Platform;
 import com.jogamp.graph.curve.Region;
 import com.jogamp.math.Recti;
 import com.jogamp.math.Vec4f;
-import com.jogamp.math.geom.AABBox;
+import com.jogamp.math.geom.Frustum;
 import com.jogamp.math.util.PMVMatrix4f;
 
 /**
@@ -314,10 +314,10 @@ public final class RegionRenderer {
     /** Returns pass2 AA sample count for Graph Region AA {@link Region#getRenderModes() render-modes}: {@link #VBAA_RENDERING_BIT} or {@link Region#MSAA_RENDERING_BIT}. */
     public final int getSampleCount() { return rs.getSampleCount(); }
 
-    /** Set the optional clipping {@link AABBox}, which shall be pre-multiplied with the Mv-matrix or null to disable. */
-    public final void setClipBBox(final AABBox clipBBox) { rs.setClipBBox(clipBBox); }
-    /** Returns the optional Mv-premultiplied clipping {@link AABBox} or null if unused. */
-    public final AABBox getClipBBox() { return rs.getClipBBox(); }
+    /** Set the optional clipping {@link Frustum}, which shall be pre-multiplied with the Mv-matrix or null to disable. */
+    public final void setClipFrustum(final Frustum clipFrustum) { rs.setClipFrustum(clipFrustum); }
+    /** Returns the optional Mv-premultiplied clipping {@link Frustum} or null if unused. */
+    public final Frustum getClipFrustum() { return rs.getClipFrustum(); }
 
     public final boolean isHintMaskSet(final int mask) { return rs.isHintMaskSet(mask); }
 
@@ -419,7 +419,7 @@ public final class RegionRenderer {
     private static final String GLSL_PARAM_COMMENT_END = "// JogAmp Graph Parameter End\n\n";
     private static final String GLSL_USE_COLOR_CHANNEL = "#define USE_COLOR_CHANNEL 1\n";
     private static final String GLSL_USE_COLOR_TEXTURE = "#define USE_COLOR_TEXTURE 1\n";
-    private static final String GLSL_USE_AABBOX_CLIPPING = "#define USE_AABBOX_CLIPPING 1\n";
+    private static final String GLSL_USE_FRUSTUM_CLIPPING = "#define USE_FRUSTUM_CLIPPING 1\n";
     private static final String GLSL_DEF_SAMPLE_COUNT = "#define SAMPLE_COUNT ";
     private static final String GLSL_CONST_SAMPLE_COUNT = "const float sample_count = ";
     private static final String GLSL_MAIN_BEGIN = "void main (void)\n{\n";
@@ -525,7 +525,7 @@ public final class RegionRenderer {
         final boolean isTwoPass;
         final boolean pass1;
         final ShaderModeSelector1 sms;
-        final boolean hasAABBoxClipping; // pass1 or pass2
+        final boolean hasFrustumClipping; // pass1 or pass2
         final boolean hasColorChannel; // pass1 only
         final boolean hasColorTexture; // pass1 only
         final String colorTexSeqID;
@@ -534,12 +534,12 @@ public final class RegionRenderer {
         final String texLookupFuncName;
         final int hashValue;
 
-        ShaderKey(final int renderModes, final boolean pass1_, final int pass2Quality, final int sampleCount, final TextureSequence colorTexSeq, final boolean hasClipBBox) {
+        ShaderKey(final int renderModes, final boolean pass1_, final int pass2Quality, final int sampleCount, final TextureSequence colorTexSeq, final boolean hasClipFrustum) {
             isTwoPass = Region.isTwoPass( renderModes );
             pass1 = pass1_;
             sms = pass1 ? ShaderModeSelector1.selectPass1(renderModes) :
                           ShaderModeSelector1.selectPass2(renderModes, pass2Quality, sampleCount);
-            hasAABBoxClipping = hasClipBBox && ( ( !isTwoPass && pass1 ) || ( isTwoPass && !pass1 ) );
+            hasFrustumClipping = hasClipFrustum && ( ( !isTwoPass && pass1 ) || ( isTwoPass && !pass1 ) );
             hasColorChannel = pass1 && Region.hasColorChannel( renderModes );
             hasColorTexture = pass1 && Region.hasColorTexture( renderModes ) && null != colorTexSeq;
             if( hasColorTexture ) {
@@ -558,7 +558,7 @@ public final class RegionRenderer {
                 // hash = ((hash << 5) - hash) + pass2Quality; // included in sms
                 // hash = ((hash << 5) - hash) + sampleCount; // included in sms
                 hash = ((hash << 5) - hash) + sms.ordinal();
-                hash = ((hash << 5) - hash) + ( hasAABBoxClipping ? 1 : 0 );
+                hash = ((hash << 5) - hash) + ( hasFrustumClipping ? 1 : 0 );
                 hash = ((hash << 5) - hash) + ( hasColorChannel ? 1 : 0 );
                 hash = ((hash << 5) - hash) + ( hasColorTexture ? 1 : 0 );
                 hash = ((hash << 5) - hash) + colorTexSeqHash;
@@ -579,7 +579,7 @@ public final class RegionRenderer {
                    // pass2Quality == o.pass2Quality && // included in sms
                    // sampleCount == o.sampleCount && // included in sms
                    sms.ordinal() == o.sms.ordinal() &&
-                   hasAABBoxClipping == o.hasAABBoxClipping &&
+                   hasFrustumClipping == o.hasFrustumClipping &&
                    hasColorChannel == o.hasColorChannel &&
                    hasColorTexture == o.hasColorTexture &&
                    colorTexSeqID.equals(o.colorTexSeqID);
@@ -587,7 +587,7 @@ public final class RegionRenderer {
         @Override
         public String toString() {
             return "ShaderKey[hash 0x"+Integer.toHexString(hashValue)+", is2Pass "+isTwoPass+", pass1 "+pass1+
-                   ", has[clip "+hasAABBoxClipping+", colChan "+hasColorChannel+", colTex "+hasColorTexture+"], "+sms+"]";
+                   ", has[clip "+hasFrustumClipping+", colChan "+hasColorChannel+", colTex "+hasColorTexture+"], "+sms+"]";
         }
     }
     private final HashMap<ShaderKey, ShaderProgram> shaderPrograms = new HashMap<ShaderKey, ShaderProgram>();
@@ -609,7 +609,7 @@ public final class RegionRenderer {
      * @see RenderState#getShaderProgram()
      */
     public final boolean useShaderProgram(final GL2ES2 gl, final int renderModes, final boolean pass1, final TextureSequence colorTexSeq) {
-        final ShaderKey shaderKey = new ShaderKey(renderModes, pass1, getAAQuality(), getSampleCount(), colorTexSeq, null != getClipBBox());
+        final ShaderKey shaderKey = new ShaderKey(renderModes, pass1, getAAQuality(), getSampleCount(), colorTexSeq, null != getClipFrustum());
 
         /**
         if(DEBUG) {
@@ -686,9 +686,9 @@ public final class RegionRenderer {
             posFp = rsFp.insertShaderSource(0, posFp, GLSL_USE_DISCARD);
         }
 
-        if( shaderKey.hasAABBoxClipping ) {
-            posVp = rsVp.insertShaderSource(0, posVp, GLSL_USE_AABBOX_CLIPPING);
-            posFp = rsFp.insertShaderSource(0, posFp, GLSL_USE_AABBOX_CLIPPING);
+        if( shaderKey.hasFrustumClipping ) {
+            posVp = rsVp.insertShaderSource(0, posVp, GLSL_USE_FRUSTUM_CLIPPING);
+            posFp = rsFp.insertShaderSource(0, posFp, GLSL_USE_FRUSTUM_CLIPPING);
         }
 
         if( shaderKey.hasColorChannel ) {
@@ -708,11 +708,11 @@ public final class RegionRenderer {
         posFp = rsFp.insertShaderSource(0, posFp, GLSL_PARAM_COMMENT_END);
 
         try {
-            if( shaderKey.hasColorTexture || shaderKey.hasAABBoxClipping ) {
-                posFp = rsFp.insertShaderSource(0, posFp, AttributeNames.class, "functions.glsl");
-            }
             posFp = rsFp.insertShaderSource(0, posFp, AttributeNames.class, "uniforms.glsl");
             posFp = rsFp.insertShaderSource(0, posFp, AttributeNames.class, "varyings.glsl");
+            if( shaderKey.hasColorTexture || shaderKey.hasFrustumClipping ) {
+                posFp = rsFp.insertShaderSource(0, posFp, AttributeNames.class, "functions.glsl");
+            }
         } catch (final IOException ioe) {
             throw new RuntimeException("Failed to read: includes", ioe);
         }
diff --git a/src/jogl/classes/com/jogamp/graph/curve/opengl/RenderState.java b/src/jogl/classes/com/jogamp/graph/curve/opengl/RenderState.java
index ed5bcb110..d6be9e07b 100644
--- a/src/jogl/classes/com/jogamp/graph/curve/opengl/RenderState.java
+++ b/src/jogl/classes/com/jogamp/graph/curve/opengl/RenderState.java
@@ -39,7 +39,7 @@ import jogamp.graph.curve.opengl.shader.UniformNames;
 
 import com.jogamp.graph.curve.Region;
 import com.jogamp.math.Vec4f;
-import com.jogamp.math.geom.AABBox;
+import com.jogamp.math.geom.Frustum;
 import com.jogamp.math.util.PMVMatrix4f;
 import com.jogamp.opengl.util.GLArrayDataWrapper;
 import com.jogamp.opengl.util.glsl.ShaderProgram;
@@ -102,8 +102,9 @@ public class RenderState {
     private int aaQuality;
     /** Default pass2 AA sample count {@value} for Graph Region AA {@link Region#getRenderModes() render-modes}: {@link Region#VBAA_RENDERING_BIT} or {@link Region#MSAA_RENDERING_BIT}. */
     private int sampleCount;
-    /** Optional clipping {@link AABBox}, which shall be pre-multiplied with the Mv-matrix. Null if unused. */
-    private AABBox clipBBox;
+    /** Optional clipping {@link Frustum}, which shall be pre-multiplied with the Mv-matrix. Null if unused. */
+    private final Frustum clipFrustum;
+    private boolean useClipFrustum;
     private int hintBitfield;
     private ShaderProgram sp;
 
@@ -205,7 +206,9 @@ public class RenderState {
         this.colorStaticBuffer = FloatBuffer.wrap(colorStatic);
         this.aaQuality = Region.DEFAULT_AA_QUALITY;
         this.sampleCount = Region.DEFAULT_AA_SAMPLE_COUNT;
-        this.clipBBox = null;
+        this.clipFrustum = new Frustum();
+        this.useClipFrustum = false;
+
         this.hintBitfield = 0;
         this.sp = null;
     }
@@ -281,10 +284,17 @@ public class RenderState {
     /** Returns pass2 AA sample count for Graph Region AA {@link Region#getRenderModes() render-modes}: {@link #VBAA_RENDERING_BIT} or {@link Region#MSAA_RENDERING_BIT}. */
     public final int getSampleCount() { return this.sampleCount; }
 
-    /** Set the optional clipping {@link AABBox}, which shall be pre-multiplied with the Mv-matrix or null to disable. */
-    public final void setClipBBox(final AABBox clipBBox) { this.clipBBox = clipBBox; }
-    /** Returns the optional Mv-premultiplied clipping {@link AABBox} or null if unused. */
-    public final AABBox getClipBBox() { return this.clipBBox; }
+    /** Set the optional clipping {@link Frustum}, which shall be pre-multiplied with the Mv-matrix or null to disable. */
+    public final void setClipFrustum(final Frustum clipFrustum) {
+        if( null != clipFrustum ) {
+            this.clipFrustum.set(clipFrustum);
+            this.useClipFrustum=true;
+        } else {
+            this.useClipFrustum=false;
+        }
+    }
+    /** Returns the optional Mv-premultiplied clipping {@link Frustum} or null if unused. */
+    public final Frustum getClipFrustum() { return useClipFrustum ? this.clipFrustum : null; }
 
     /**
      *
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PMSAAES2.java b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PMSAAES2.java
index ae4a734be..a6ba0e810 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PMSAAES2.java
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PMSAAES2.java
@@ -45,6 +45,7 @@ import com.jogamp.graph.curve.opengl.RenderState;
 import com.jogamp.math.Matrix4f;
 import com.jogamp.math.Recti;
 import com.jogamp.math.geom.AABBox;
+import com.jogamp.math.geom.Frustum;
 import com.jogamp.math.util.SyncMatrices4f16;
 import com.jogamp.opengl.FBObject;
 import com.jogamp.opengl.FBObject.Attachment;
@@ -66,8 +67,8 @@ public final class VBORegion2PMSAAES2  extends GLRegion {
     private final GLUniformData gcu_ColorTexUnit;
     private final float[] colorTexBBox; // minX/minY, maxX/maxY, texW/texH
     private final GLUniformData gcu_ColorTexBBox; // vec2 gcu_ColorTexBBox[3] -> boxMin[2], boxMax[2] and texSize[2]
-    private final float[] clipBBox; // minX/minY/minZ, maxX/maxY/maxZ
-    private final GLUniformData gcu_ClipBBox; // uniform vec3  gcu_ClipBBox[2]; // box-min[3], box-max[3]
+    private final float[/* 4*6 */] clipFrustum; // 6 frustum planes, each [n.x, n.y. n.z, d]
+    private final GLUniformData gcu_ClipFrustum; // uniform vec4  gcu_ClipFrustum[6]; // L, R, B, T, N, F
     private ShaderProgram spPass1 = null;
 
     // Pass-2:
@@ -111,8 +112,8 @@ public final class VBORegion2PMSAAES2  extends GLRegion {
             colorTexBBox = null;
             gcu_ColorTexBBox = null;
         }
-        clipBBox = new float[6];
-        gcu_ClipBBox = new GLUniformData(UniformNames.gcu_ClipBBox, 3, FloatBuffer.wrap(clipBBox));
+        clipFrustum = new float[4*6];
+        gcu_ClipFrustum = new GLUniformData(UniformNames.gcu_ClipFrustum, 4, FloatBuffer.wrap(clipFrustum));
         gcu_PMVMatrix02 = new GLUniformData(UniformNames.gcu_PMVMatrix02, 4, 4, new SyncMatrices4f16( new Matrix4f[] { matP, matMv } ));
 
         // Pass 2:
@@ -185,7 +186,7 @@ public final class VBORegion2PMSAAES2  extends GLRegion {
         final boolean hasColorTexture = Region.hasColorTexture( curRenderModes ) && null != colorTexSeq;
 
         final RenderState rs = renderer.getRenderState();
-        final boolean hasAABBoxClipping = null != rs.getClipBBox() && ( ( !isTwoPass && pass1 ) || ( isTwoPass && !pass1 ) );
+        final boolean hasFrustumClipping = null != rs.getClipFrustum() && ( ( !isTwoPass && pass1 ) || ( isTwoPass && !pass1 ) );
 
         final boolean updateLocGlobal = renderer.useShaderProgram(gl, curRenderModes, pass1, colorTexSeq);
         final ShaderProgram sp = renderer.getRenderState().getShaderProgram();
@@ -230,8 +231,8 @@ public final class VBORegion2PMSAAES2  extends GLRegion {
             rsLocal.update(gl, rs, updateLocLocal, curRenderModes, true, false, true);
             rs.updateUniformDataLoc(gl, updateLocLocal, false /* updateData */, gcu_FboTexUnit, true); // FIXME always update if changing tex-unit
         }
-        if( hasAABBoxClipping && updateLocLocal ) {
-            rs.updateUniformLoc(gl, true, gcu_ClipBBox, true);
+        if( hasFrustumClipping && updateLocLocal ) {
+            rs.updateUniformLoc(gl, true, gcu_ClipFrustum, true);
         }
     }
 
@@ -381,11 +382,10 @@ public final class VBORegion2PMSAAES2  extends GLRegion {
         }
 
         {
-            final AABBox cb = rs.getClipBBox();
-            if( null != cb ) {
-                clipBBox[0] = cb.getMinX(); clipBBox[1] = cb.getMinY(); clipBBox[2] = cb.getMinZ();
-                clipBBox[3] = cb.getMaxX(); clipBBox[4] = cb.getMaxY(); clipBBox[5] = cb.getMaxZ();
-                gl.glUniform(gcu_ClipBBox); // Always update, since program maybe used by multiple regions
+            final Frustum f = rs.getClipFrustum();
+            if( null != f ) {
+                f.getPlanes(clipFrustum, 0);
+                gl.glUniform(gcu_ClipFrustum); // Always update, since program maybe used by multiple regions
             }
         }
 
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PVBAAES2.java b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PVBAAES2.java
index bf23f33e9..4585c4cab 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PVBAAES2.java
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegion2PVBAAES2.java
@@ -46,6 +46,7 @@ import com.jogamp.graph.curve.opengl.RenderState;
 import com.jogamp.math.Matrix4f;
 import com.jogamp.math.Recti;
 import com.jogamp.math.geom.AABBox;
+import com.jogamp.math.geom.Frustum;
 import com.jogamp.math.util.SyncMatrices4f16;
 import com.jogamp.opengl.FBObject;
 import com.jogamp.opengl.FBObject.Attachment;
@@ -71,8 +72,8 @@ public final class VBORegion2PVBAAES2  extends GLRegion {
     private final GLUniformData gcu_ColorTexUnit;
     private final float[] colorTexBBox; // minX/minY, maxX/maxY, texW/texH
     private final GLUniformData gcu_ColorTexBBox; // vec2 gcu_ColorTexBBox[3] -> boxMin[2], boxMax[2] and texSize[2]
-    private final float[] clipBBox; // minX/minY/minZ, maxX/maxY/maxZ
-    private final GLUniformData gcu_ClipBBox; // uniform vec3  gcu_ClipBBox[2]; // box-min[3], box-max[3]
+    private final float[/* 4*6 */] clipFrustum; // 6 frustum planes, each [n.x, n.y. n.z, d]
+    private final GLUniformData gcu_ClipFrustum; // uniform vec4  gcu_ClipFrustum[6]; // L, R, B, T, N, F
     private ShaderProgram spPass1 = null;
 
     // Pass-2:
@@ -96,6 +97,50 @@ public final class VBORegion2PVBAAES2  extends GLRegion {
 
     final int[] maxTexSize = new int[] { -1 } ;
 
+    public VBORegion2PVBAAES2(final GLProfile glp, final int renderModes, final TextureSequence colorTexSeq, final int pass2TexUnit,
+                              final int initialVerticesCount, final int initialIndicesCount)
+    {
+        super(glp, renderModes, colorTexSeq);
+
+        rsLocal = new RenderState.ProgramLocal();
+
+        // Pass 1:
+        initBuffer(initialVerticesCount, initialIndicesCount);
+
+        if( hasColorTexture() ) {
+            gcu_ColorTexUnit = new GLUniformData(UniformNames.gcu_ColorTexUnit, colorTexSeq.getTextureUnit());
+            colorTexBBox = new float[6];
+            gcu_ColorTexBBox = new GLUniformData(UniformNames.gcu_ColorTexBBox, 2, FloatBuffer.wrap(colorTexBBox));
+        } else {
+            gcu_ColorTexUnit = null;
+            colorTexBBox = null;
+            gcu_ColorTexBBox = null;
+        }
+        clipFrustum = new float[4*6];
+        gcu_ClipFrustum = new GLUniformData(UniformNames.gcu_ClipFrustum, 4, FloatBuffer.wrap(clipFrustum));
+        gcu_PMVMatrix02 = new GLUniformData(UniformNames.gcu_PMVMatrix02, 4, 4, new SyncMatrices4f16( new Matrix4f[] { matP, matMv } ));
+
+        // Pass 2:
+        gcu_FboTexUnit = new GLUniformData(UniformNames.gcu_FboTexUnit, pass2TexUnit);
+        gcu_FboTexSize = new GLUniformData(UniformNames.gcu_FboTexSize, 2, FloatBuffer.wrap(new float[2]));
+
+        indicesFbo = GLArrayDataServer.createData(3, GL.GL_UNSIGNED_SHORT, 2, GL.GL_STATIC_DRAW, GL.GL_ELEMENT_ARRAY_BUFFER);
+        indicesFbo.puts((short) 0); indicesFbo.puts((short) 1); indicesFbo.puts((short) 3);
+        indicesFbo.puts((short) 1); indicesFbo.puts((short) 2); indicesFbo.puts((short) 3);
+        indicesFbo.seal(true);
+
+        gca_FboTexCoordsAttr = GLArrayDataServer.createGLSL(AttributeNames.FBO_TEXCOORDS_ATTR_NAME, 2, GL.GL_FLOAT,
+                                                           false, 4, GL.GL_STATIC_DRAW);
+        gca_FboTexCoordsAttr.putf(0); gca_FboTexCoordsAttr.putf(0);
+        gca_FboTexCoordsAttr.putf(0); gca_FboTexCoordsAttr.putf(1);
+        gca_FboTexCoordsAttr.putf(1); gca_FboTexCoordsAttr.putf(1);
+        gca_FboTexCoordsAttr.putf(1); gca_FboTexCoordsAttr.putf(0);
+        gca_FboTexCoordsAttr.seal(true);
+
+        gca_FboVerticesAttr = GLArrayDataServer.createGLSL(AttributeNames.FBO_VERTEX_ATTR_NAME, 3, GL.GL_FLOAT,
+                                                           false, 4, GL.GL_STATIC_DRAW);
+    }
+
     /**
      * <p>
      * Since multiple {@link Region}s may share one
@@ -113,7 +158,7 @@ public final class VBORegion2PVBAAES2  extends GLRegion {
         final boolean hasColorTexture = Region.hasColorTexture( curRenderModes ) && null != colorTexSeq;
 
         final RenderState rs = renderer.getRenderState();
-        final boolean hasAABBoxClipping = null != rs.getClipBBox() && ( ( !isTwoPass && pass1 ) || ( isTwoPass && !pass1 ) );
+        final boolean hasFrustumClipping = null != rs.getClipFrustum() && ( ( !isTwoPass && pass1 ) || ( isTwoPass && !pass1 ) );
 
         final boolean updateLocGlobal = renderer.useShaderProgram(gl, curRenderModes, pass1, colorTexSeq);
         final ShaderProgram sp = renderer.getRenderState().getShaderProgram();
@@ -159,55 +204,11 @@ public final class VBORegion2PVBAAES2  extends GLRegion {
             rs.updateUniformDataLoc(gl, updateLocLocal, false /* updateData */, gcu_FboTexUnit, true); // FIXME always update if changing tex-unit
             rs.updateUniformLoc(gl, updateLocLocal, gcu_FboTexSize, rs.getSampleCount() > 1); // maybe optimized away for sampleCount <= 1
         }
-        if( hasAABBoxClipping && updateLocLocal ) {
-            rs.updateUniformLoc(gl, true, gcu_ClipBBox, true);
+        if( hasFrustumClipping && updateLocLocal ) {
+            rs.updateUniformLoc(gl, true, gcu_ClipFrustum, true);
         }
     }
 
-    public VBORegion2PVBAAES2(final GLProfile glp, final int renderModes, final TextureSequence colorTexSeq, final int pass2TexUnit,
-                              final int initialVerticesCount, final int initialIndicesCount)
-    {
-        super(glp, renderModes, colorTexSeq);
-
-        rsLocal = new RenderState.ProgramLocal();
-
-        // Pass 1:
-        initBuffer(initialVerticesCount, initialIndicesCount);
-
-        if( hasColorTexture() ) {
-            gcu_ColorTexUnit = new GLUniformData(UniformNames.gcu_ColorTexUnit, colorTexSeq.getTextureUnit());
-            colorTexBBox = new float[6];
-            gcu_ColorTexBBox = new GLUniformData(UniformNames.gcu_ColorTexBBox, 2, FloatBuffer.wrap(colorTexBBox));
-        } else {
-            gcu_ColorTexUnit = null;
-            colorTexBBox = null;
-            gcu_ColorTexBBox = null;
-        }
-        clipBBox = new float[6];
-        gcu_ClipBBox = new GLUniformData(UniformNames.gcu_ClipBBox, 3, FloatBuffer.wrap(clipBBox));
-        gcu_PMVMatrix02 = new GLUniformData(UniformNames.gcu_PMVMatrix02, 4, 4, new SyncMatrices4f16( new Matrix4f[] { matP, matMv } ));
-
-        // Pass 2:
-        gcu_FboTexUnit = new GLUniformData(UniformNames.gcu_FboTexUnit, pass2TexUnit);
-        gcu_FboTexSize = new GLUniformData(UniformNames.gcu_FboTexSize, 2, FloatBuffer.wrap(new float[2]));
-
-        indicesFbo = GLArrayDataServer.createData(3, GL.GL_UNSIGNED_SHORT, 2, GL.GL_STATIC_DRAW, GL.GL_ELEMENT_ARRAY_BUFFER);
-        indicesFbo.puts((short) 0); indicesFbo.puts((short) 1); indicesFbo.puts((short) 3);
-        indicesFbo.puts((short) 1); indicesFbo.puts((short) 2); indicesFbo.puts((short) 3);
-        indicesFbo.seal(true);
-
-        gca_FboTexCoordsAttr = GLArrayDataServer.createGLSL(AttributeNames.FBO_TEXCOORDS_ATTR_NAME, 2, GL.GL_FLOAT,
-                                                           false, 4, GL.GL_STATIC_DRAW);
-        gca_FboTexCoordsAttr.putf(0); gca_FboTexCoordsAttr.putf(0);
-        gca_FboTexCoordsAttr.putf(0); gca_FboTexCoordsAttr.putf(1);
-        gca_FboTexCoordsAttr.putf(1); gca_FboTexCoordsAttr.putf(1);
-        gca_FboTexCoordsAttr.putf(1); gca_FboTexCoordsAttr.putf(0);
-        gca_FboTexCoordsAttr.seal(true);
-
-        gca_FboVerticesAttr = GLArrayDataServer.createGLSL(AttributeNames.FBO_VERTEX_ATTR_NAME, 3, GL.GL_FLOAT,
-                                                           false, 4, GL.GL_STATIC_DRAW);
-    }
-
     @Override
     public void setTextureUnit(final int pass2TexUnit) {
         gcu_FboTexUnit.setData(pass2TexUnit);
@@ -420,11 +421,10 @@ public final class VBORegion2PVBAAES2  extends GLRegion {
 
         gl.glUniform(gcu_FboTexSize);
         {
-            final AABBox cb = rs.getClipBBox();
-            if( null != cb ) {
-                clipBBox[0] = cb.getMinX(); clipBBox[1] = cb.getMinY(); clipBBox[2] = cb.getMinZ();
-                clipBBox[3] = cb.getMaxX(); clipBBox[4] = cb.getMaxY(); clipBBox[5] = cb.getMaxZ();
-                gl.glUniform(gcu_ClipBBox); // Always update, since program maybe used by multiple regions
+            final Frustum f = rs.getClipFrustum();
+            if( null != f ) {
+                f.getPlanes(clipFrustum, 0);
+                gl.glUniform(gcu_ClipFrustum); // Always update, since program maybe used by multiple regions
             }
         }
 
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegionSPES2.java b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegionSPES2.java
index 3a568758c..c4e842791 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/VBORegionSPES2.java
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/VBORegionSPES2.java
@@ -40,7 +40,7 @@ import com.jogamp.graph.curve.Region;
 import com.jogamp.graph.curve.opengl.GLRegion;
 import com.jogamp.graph.curve.opengl.RegionRenderer;
 import com.jogamp.graph.curve.opengl.RenderState;
-import com.jogamp.math.geom.AABBox;
+import com.jogamp.math.geom.Frustum;
 import com.jogamp.opengl.util.glsl.ShaderProgram;
 import com.jogamp.opengl.util.texture.Texture;
 import com.jogamp.opengl.util.texture.TextureSequence;
@@ -52,8 +52,8 @@ public final class VBORegionSPES2 extends GLRegion {
     private final GLUniformData gcu_ColorTexUnit;
     private final float[] colorTexBBox; // minX/minY, maxX/maxY, texW/texH
     private final GLUniformData gcu_ColorTexBBox; // vec2 gcu_ColorTexBBox[3] -> boxMin[2], boxMax[2] and texSize[2]
-    private final float[] clipBBox; // minX/minY/minZ, maxX/maxY/maxZ
-    private final GLUniformData gcu_ClipBBox; // uniform vec3  gcu_ClipBBox[2]; // box-min[3], box-max[3]
+    private final float[/* 4*6 */] clipFrustum; // 6 frustum planes, each [n.x, n.y. n.z, d]
+    private final GLUniformData gcu_ClipFrustum; // uniform vec4  gcu_ClipFrustum[6]; // L, R, B, T, N, F
     private ShaderProgram spPass1 = null;
 
     public VBORegionSPES2(final GLProfile glp, final int renderModes, final TextureSequence colorTexSeq,
@@ -74,8 +74,8 @@ public final class VBORegionSPES2 extends GLRegion {
             colorTexBBox = null;
             gcu_ColorTexBBox = null;
         }
-        clipBBox = new float[6];
-        gcu_ClipBBox = new GLUniformData(UniformNames.gcu_ClipBBox, 3, FloatBuffer.wrap(clipBBox));
+        clipFrustum = new float[4*6];
+        gcu_ClipFrustum = new GLUniformData(UniformNames.gcu_ClipFrustum, 4, FloatBuffer.wrap(clipFrustum));
     }
 
     @Override
@@ -122,7 +122,7 @@ public final class VBORegionSPES2 extends GLRegion {
         final boolean hasColorTexture = Region.hasColorTexture( curRenderModes ) && null != colorTexSeq;
 
         final RenderState rs = renderer.getRenderState();
-        final boolean hasAABBoxClipping = null != rs.getClipBBox();
+        final boolean hasFrustumClipping = null != rs.getClipFrustum();
 
         final boolean updateLocGlobal = renderer.useShaderProgram(gl, curRenderModes, true, colorTexSeq);
         final ShaderProgram sp = renderer.getRenderState().getShaderProgram();
@@ -139,8 +139,8 @@ public final class VBORegionSPES2 extends GLRegion {
             if( hasColorChannel && null != gca_ColorsAttr ) {
                 rs.updateAttributeLoc(gl, true, gca_ColorsAttr, throwOnError);
             }
-            if( hasAABBoxClipping ) {
-                rs.updateUniformLoc(gl, true, gcu_ClipBBox, throwOnError);
+            if( hasFrustumClipping ) {
+                rs.updateUniformLoc(gl, true, gcu_ClipFrustum, throwOnError);
             }
         }
         rsLocal.update(gl, rs, updateLocLocal, curRenderModes, true, true, throwOnError);
@@ -158,11 +158,10 @@ public final class VBORegionSPES2 extends GLRegion {
 
         useShaderProgram(gl, renderer, curRenderModes);
         {
-            final AABBox cb = renderer.getClipBBox();
-            if( null != cb ) {
-                clipBBox[0] = cb.getMinX(); clipBBox[1] = cb.getMinY(); clipBBox[2] = cb.getMinZ();
-                clipBBox[3] = cb.getMaxX(); clipBBox[4] = cb.getMaxY(); clipBBox[5] = cb.getMaxZ();
-                gl.glUniform(gcu_ClipBBox); // Always update, since program maybe used by multiple regions
+            final Frustum f = renderer.getClipFrustum();
+            if( null != f ) {
+                f.getPlanes(clipFrustum, 0);
+                gl.glUniform(gcu_ClipFrustum); // Always update, since program maybe used by multiple regions
             }
         }
 
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/UniformNames.java b/src/jogl/classes/jogamp/graph/curve/opengl/shader/UniformNames.java
index 4a66295f2..7a20fc2da 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/UniformNames.java
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/UniformNames.java
@@ -6,7 +6,7 @@ public class UniformNames {
     public static final String gcu_Weight = "gcu_Weight";
     public static final String gcu_ColorTexUnit = "gcu_ColorTexUnit";
     public static final String gcu_ColorTexBBox = "gcu_ColorTexBBox";
-    public static final String gcu_ClipBBox = "gcu_ClipBBox";
+    public static final String gcu_ClipFrustum = "gcu_ClipFrustum";
 
     public static final String gcu_PMVMatrix02 = "gcu_PMVMatrix02"; // gcu_PMVMatrix[3]; // P, Mv, and Mvi
     public static final String gcu_FboTexUnit = "gcu_FboTexUnit";
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve_simple.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve_simple.glsl
index c5850f5fa..edb3b553b 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve_simple.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve_simple.glsl
@@ -1,7 +1,7 @@
 // Copyright 2010-2024 JogAmp Community. All rights reserved.
     
-#ifdef USE_AABBOX_CLIPPING
-    if( is_inside(gcv_ClipBBoxCoord, gcu_ClipBBox[0], gcu_ClipBBox[1]) < 0.5 ) {
+#ifdef USE_FRUSTUM_CLIPPING
+    if( isOutsideMvFrustum(gcv_ClipCoord) ) {
         #if USE_DISCARD
             discard; // discard freezes NV tegra2 compiler
         #else
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve_weight.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve_weight.glsl
index e7172d834..9c8b6a4a5 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve_weight.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve_weight.glsl
@@ -1,7 +1,7 @@
 // Copyright 2010-2024 JogAmp Community. All rights reserved.
 
-#ifdef USE_AABBOX_CLIPPING
-    if( is_inside(gcv_ClipBBoxCoord, gcu_ClipBBox[0], gcu_ClipBBox[1]) < 0.5 ) {
+#ifdef USE_FRUSTUM_CLIPPING
+    if( isOutsideMvFrustum(gcv_ClipCoord) ) {
         #if USE_DISCARD
             discard; // discard freezes NV tegra2 compiler
         #else
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-msaa.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-msaa.glsl
index 3d4cdc887..3b7291446 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-msaa.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-msaa.glsl
@@ -1,6 +1,7 @@
     // Pass-2: Dump Texture
-#ifdef USE_AABBOX_CLIPPING
-    if( is_inside(gcv_ClipBBoxCoord, gcu_ClipBBox[0], gcu_ClipBBox[1]) < 0.5 ) {
+    
+#ifdef USE_FRUSTUM_CLIPPING
+    if( isOutsideMvFrustum(gcv_ClipCoord) ) {
         #if USE_DISCARD
             discard; // discard freezes NV tegra2 compiler
         #else
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_bforce_even.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_bforce_even.glsl
index 5e14a1a23..c71267be4 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_bforce_even.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_bforce_even.glsl
@@ -1,10 +1,10 @@
     // Pass-2: AA on Texture
     // Note: gcv_FboTexCoord is in center of sample pixels.
 
-#ifdef USE_AABBOX_CLIPPING
-    if( is_inside(gcv_ClipBBoxCoord, gcu_ClipBBox[0], gcu_ClipBBox[1]) < 0.5 ) {
+#ifdef USE_FRUSTUM_CLIPPING
+    if( isOutsideMvFrustum(gcv_ClipCoord) ) {
         #if USE_DISCARD
-            discard; // discard freezes NV tegra2 compiler
+            discard; // discard freezes NV tegra2 compiler            
         #else
             mgl_FragColor = vec4(0);
         #endif
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_bforce_odd.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_bforce_odd.glsl
index b7d2e0e4e..4fa3c601e 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_bforce_odd.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_bforce_odd.glsl
@@ -1,8 +1,8 @@
     // Pass-2: AA on Texture
     // Note: gcv_FboTexCoord is in center of sample pixels.
 
-#ifdef USE_AABBOX_CLIPPING
-    if( is_inside(gcv_ClipBBoxCoord, gcu_ClipBBox[0], gcu_ClipBBox[1]) < 0.5 ) {
+#ifdef USE_FRUSTUM_CLIPPING
+    if( isOutsideMvFrustum(gcv_ClipCoord) ) {
         #if USE_DISCARD
             discard; // discard freezes NV tegra2 compiler
         #else
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_flipquad3.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_flipquad3.glsl
index da0306425..76b064420 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_flipquad3.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-vbaa_flipquad3.glsl
@@ -4,8 +4,8 @@
         // 
         // Same as flipquad - but w/ rgss coordinates
 
-#ifdef USE_AABBOX_CLIPPING
-    if( is_inside(gcv_ClipBBoxCoord, gcu_ClipBBox[0], gcu_ClipBBox[1]) < 0.5 ) {
+#ifdef USE_FRUSTUM_CLIPPING
+    if( isOutsideMvFrustum(gcv_ClipCoord) ) {
         #if USE_DISCARD
             discard; // discard freezes NV tegra2 compiler
         #else
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2.vp b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2.vp
index dce78b9c8..5ee5fcb46 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2.vp
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass2.vp
@@ -14,8 +14,8 @@ void main(void)
     // gl_Position = gcu_PMVMatrix01[0] * gcu_PMVMatrix01[1] * vec4(gca_FboVertices, 1);
     gl_Position = gcu_PMVMatrix01[0] * gcu_PMVMatrix01[1] * gca_FboVertices;
     
-#ifdef USE_AABBOX_CLIPPING
-    gcv_ClipBBoxCoord = (gcu_PMVMatrix01[1] * gca_FboVertices).xyz; // Mv
+#ifdef USE_FRUSTUM_CLIPPING
+    gcv_ClipCoord = (gcu_PMVMatrix01[1] * gca_FboVertices).xyz; // Mv
 #endif    
     
     gcv_FboTexCoord = gca_FboTexCoords;
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-single.vp b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-single.vp
index 2f07ad7d0..bda10c432 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-single.vp
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-single.vp
@@ -24,8 +24,8 @@ void main(void)
     }
 #endif
 
-#ifdef USE_AABBOX_CLIPPING
-    gcv_ClipBBoxCoord = (gcu_PMVMatrix01[1] * gca_Vertices).xyz; // Mv
+#ifdef USE_FRUSTUM_CLIPPING
+    gcv_ClipCoord = (gcu_PMVMatrix01[1] * gca_Vertices).xyz; // Mv
 #endif    
     
 #ifdef USE_COLOR_TEXTURE
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/functions.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/functions.glsl
index 41e65178e..3b36b021a 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/functions.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/functions.glsl
@@ -75,12 +75,30 @@ vec4 clip_coord(vec4 col_in, vec4 col_ex, vec3 coord, vec3 low, vec3 high) {
  * </p>
  */
 float is_inside(vec2 coord, vec2 low, vec2 high) {
-    return v_mul( step(low, coord) ) * ( 1 - v_or( step(high+EPSILON, coord) ) );    
+    return v_mul( step(low-EPSILON, coord) ) * ( 1 - v_or( step(high+EPSILON, coord) ) );    
 }
 /** Branch-less clipping test using vec3 coordinates and low/high clipping. */
 float is_inside(vec3 coord, vec3 low, vec3 high) {
-    return v_mul( step(low, coord) ) * ( 1 - v_or( step(high+EPSILON, coord) ) );    
+    return v_mul( step(low-EPSILON, coord) ) * ( 1 - v_or( step(high+EPSILON, coord) ) );
 }
 
+/** Return distance of plane {n, d} to given point p. */
+float planeDistance(vec3 n, float d, vec3 p) {
+    return dot(n, p) + d;
+}
+
+#ifdef USE_FRUSTUM_CLIPPING
+
+bool isOutsideMvFrustum(vec3 p) { 
+    return planeDistance(gcu_ClipFrustum[0].xyz, gcu_ClipFrustum[0].w, p) < 0 ||
+           planeDistance(gcu_ClipFrustum[1].xyz, gcu_ClipFrustum[1].w, p) < 0 ||
+           planeDistance(gcu_ClipFrustum[2].xyz, gcu_ClipFrustum[2].w, p) < 0 ||
+           planeDistance(gcu_ClipFrustum[3].xyz, gcu_ClipFrustum[3].w, p) < 0 ||
+           planeDistance(gcu_ClipFrustum[4].xyz, gcu_ClipFrustum[4].w, p) < 0 ||
+           planeDistance(gcu_ClipFrustum[5].xyz, gcu_ClipFrustum[5].w, p) < 0;    
+}
+
+#endif // USE_FRUSTUM_CLIPPING
+
 #endif // functions_glsl
 
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/uniforms.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/uniforms.glsl
index a9554528c..18c563fbb 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/uniforms.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/uniforms.glsl
@@ -10,8 +10,8 @@ uniform float   gcu_Weight;
 #ifdef USE_COLOR_TEXTURE
     uniform vec2  gcu_ColorTexBBox[3]; // box-min[2], box-max[2] and tex-size[2] 
 #endif
-#ifdef USE_AABBOX_CLIPPING
-    uniform vec3  gcu_ClipBBox[2]; // box-min[3], box-max[3]
+#ifdef USE_FRUSTUM_CLIPPING
+    uniform vec4  gcu_ClipFrustum[6]; // L, R, B, T, N, F each {n.x, n.y, n.z, d} 
 #endif    
 
 uniform mat4    gcu_PMVMatrix02[3]; // P, Mv, and Mvi
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/varyings.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/varyings.glsl
index 0e8d5b843..6139c9d8f 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/varyings.glsl
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/varyings.glsl
@@ -10,8 +10,8 @@ varying vec2  gcv_FboTexCoord;
 #ifdef USE_COLOR_TEXTURE
     varying vec2  gcv_ColorTexCoord;
 #endif
-#ifdef USE_AABBOX_CLIPPING
-    varying vec3  gcv_ClipBBoxCoord;
+#ifdef USE_FRUSTUM_CLIPPING
+    varying vec3  gcv_ClipCoord;
 #endif    
 
 #ifdef USE_COLOR_CHANNEL