diff options
Diffstat (limited to 'src/jogl/classes/com/jogamp/opengl/math')
| -rw-r--r-- | src/jogl/classes/com/jogamp/opengl/math/Ray.java | 57 | ||||
| -rw-r--r-- | src/jogl/classes/com/jogamp/opengl/math/VectorUtil.java | 6 | ||||
| -rw-r--r-- | src/jogl/classes/com/jogamp/opengl/math/geom/AABBox.java | 64 |
3 files changed, 123 insertions, 4 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/math/Ray.java b/src/jogl/classes/com/jogamp/opengl/math/Ray.java new file mode 100644 index 000000000..3fe7dd3b1 --- /dev/null +++ b/src/jogl/classes/com/jogamp/opengl/math/Ray.java @@ -0,0 +1,57 @@ +/** + * Copyright 2014 JogAmp Community. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, are + * permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this list of + * conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, this list + * of conditions and the following disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * The views and conclusions contained in the software and documentation are those of the + * authors and should not be interpreted as representing official policies, either expressed + * or implied, of JogAmp Community. + */ +package com.jogamp.opengl.math; + +import com.jogamp.opengl.math.geom.AABBox; + +/** + * Simple compound denoting a ray. + * <p> + * A ray, also known as a half line, consists out of it's <i>origin</i> + * and <i>direction</i>. Hence it is bound to only the <i>origin</i> side, + * where the other end is +infinitive. + * <pre> + * R(t) = R0 + Rd * t with R0 origin, Rd direction and t > 0.0 + * </pre> + * </p> + * <p> + * A {@link Ray} maybe used for <i>picking</i> + * using a {@link AABBox#intersectsRay(Ray, float[]) bounding box}. + * </p> + */ +public class Ray { + /** Origin of Ray, float[3]. */ + public final float[] orig = new float[3]; + + /** Normalized direction vector of ray, float[3]. */ + public final float[] dir = new float[3]; + + public String toString() { + return "Ray[orig["+orig[0]+", "+orig[1]+", "+orig[2]+"], dir["+dir[0]+", "+dir[1]+", "+dir[2]+"]]"; + } +}
\ No newline at end of file diff --git a/src/jogl/classes/com/jogamp/opengl/math/VectorUtil.java b/src/jogl/classes/com/jogamp/opengl/math/VectorUtil.java index 778c17a53..3aaed2032 100644 --- a/src/jogl/classes/com/jogamp/opengl/math/VectorUtil.java +++ b/src/jogl/classes/com/jogamp/opengl/math/VectorUtil.java @@ -601,14 +601,16 @@ public class VectorUtil { return result; } - /** Compute intersection between two segments + /** + * Compute intersection between two segments * @param a vertex 1 of first segment * @param b vertex 2 of first segment * @param c vertex 1 of second segment * @param d vertex 2 of second segment * @return true if the segments intersect, otherwise returns false */ - public static boolean testSeg2SegIntersection(final Vert2fImmutable a, final Vert2fImmutable b, final Vert2fImmutable c, final Vert2fImmutable d) { + public static boolean testSeg2SegIntersection(final Vert2fImmutable a, final Vert2fImmutable b, + final Vert2fImmutable c, final Vert2fImmutable d) { final float[] A = a.getCoord(); final float[] B = b.getCoord(); final float[] C = c.getCoord(); diff --git a/src/jogl/classes/com/jogamp/opengl/math/geom/AABBox.java b/src/jogl/classes/com/jogamp/opengl/math/geom/AABBox.java index 3be8a77f8..8a18ea4c4 100644 --- a/src/jogl/classes/com/jogamp/opengl/math/geom/AABBox.java +++ b/src/jogl/classes/com/jogamp/opengl/math/geom/AABBox.java @@ -30,6 +30,7 @@ package com.jogamp.opengl.math.geom; import jogamp.graph.geom.plane.AffineTransform; import com.jogamp.opengl.math.FloatUtil; +import com.jogamp.opengl.math.Ray; import com.jogamp.opengl.math.VectorUtil; import com.jogamp.opengl.util.PMVMatrix; @@ -38,6 +39,15 @@ import com.jogamp.opengl.util.PMVMatrix; * Axis Aligned Bounding Box. Defined by two 3D coordinates (low and high) * The low being the the lower left corner of the box, and the high being the upper * right corner of the box. + * <p> + * A few references for collision detection, intersections: + * <pre> + * http://www.realtimerendering.com/intersections.html + * http://www.codercorner.com/RayAABB.cpp + * http://www.siggraph.org/education/materials/HyperGraph/raytrace/rtinter0.htm + * http://realtimecollisiondetection.net/files/levine_swept_sat.txt + * </pre> + * </p> * */ public class AABBox implements Cloneable { @@ -294,7 +304,7 @@ public class AABBox implements Cloneable { * @param h hight * @return true if this AABBox might have a common region with this 2D region */ - public final boolean intersects(final float x, final float y, final float w, final float h) { + public final boolean intersects2DRegion(final float x, final float y, final float w, final float h) { if (w <= 0 || h <= 0) { return false; } @@ -313,6 +323,56 @@ public class AABBox implements Cloneable { y < y0 + _h); } + /** + * Check if {@link Ray} intersects this bounding box. + * <p> + * Versions uses the SAT[1], testing 6 axes. + * Original code for OBBs from MAGIC. + * Rewritten for AABBs and reorganized for early exits[2]. + * </p> + * <pre> + * [1] SAT = Separating Axis Theorem + * [2] http://www.codercorner.com/RayAABB.cpp + * </pre> + * @param ray + * @return + */ + public final boolean intersectsRay(final Ray ray) { + // diff[XYZ] -> VectorUtil.subVec3(diff, ray.orig, center); + // ext[XYZ] -> extend VectorUtil.subVec3(ext, high, center); + + final float dirX = ray.dir[0]; + final float diffX = ray.orig[0] - center[0]; + final float extX = high[0] - center[0]; + if( Math.abs(diffX) > extX && diffX*dirX >= 0f ) return false; + + final float dirY = ray.dir[1]; + final float diffY = ray.orig[1] - center[1]; + final float extY = high[1] - center[1]; + if( Math.abs(diffY) > extY && diffY*dirY >= 0f ) return false; + + final float dirZ = ray.dir[2]; + final float diffZ = ray.orig[2] - center[2]; + final float extZ = high[2] - center[2]; + if( Math.abs(diffZ) > extZ && diffZ*dirZ >= 0f ) return false; + + final float absDirY = Math.abs(dirY); + final float absDirZ = Math.abs(dirZ); + + float f = dirY * diffZ - dirZ * diffY; + if( Math.abs(f) > extY*absDirZ + extZ*absDirY ) return false; + + final float absDirX = Math.abs(dirX); + + f = dirZ * diffX - dirX * diffZ; + if( Math.abs(f) > extX*absDirZ + extZ*absDirX ) return false; + + f = dirX * diffY - dirY * diffX; + if( Math.abs(f) > extX*absDirY + extY*absDirX ) return false; + + return true; + } + /** Get the size of the Box where the size is represented by the * length of the vector between low and high. @@ -399,7 +459,7 @@ public class AABBox implements Cloneable { if( null == obj || !(obj instanceof AABBox) ) { return false; } - final AABBox other = (AABBox) obj; + final AABBox other = (AABBox) obj; return VectorUtil.isVec2Equal(low, 0, other.low, 0, FloatUtil.EPSILON) && VectorUtil.isVec3Equal(high, 0, other.high, 0, FloatUtil.EPSILON) ; } |