diff options
author | Sven Gothel <[email protected]> | 2012-11-12 07:30:54 +0100 |
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committer | Sven Gothel <[email protected]> | 2012-11-12 07:30:54 +0100 |
commit | d621fcf6f2c6096ea71bf2ebb767c48f8eb3a5e1 (patch) | |
tree | 621852d76cf20ef7e9284a8ac7a7b212f63ae10e /src/jogl/classes/com/jogamp/opengl/math/geom/Frustum.java | |
parent | 92406ae9a2153c1b6a74c29d9939a021d898dcf1 (diff) |
Frustum: Add doc. about Frustum's Plane's normal orientation
Diffstat (limited to 'src/jogl/classes/com/jogamp/opengl/math/geom/Frustum.java')
-rw-r--r-- | src/jogl/classes/com/jogamp/opengl/math/geom/Frustum.java | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/math/geom/Frustum.java b/src/jogl/classes/com/jogamp/opengl/math/geom/Frustum.java index c18740b66..800df45bb 100644 --- a/src/jogl/classes/com/jogamp/opengl/math/geom/Frustum.java +++ b/src/jogl/classes/com/jogamp/opengl/math/geom/Frustum.java @@ -69,7 +69,13 @@ public class Frustum { } } - /** Plane equation := dot(n, x - p) = 0 -> ax + bc + cx + d == 0 */ + /** + * Plane equation := dot(n, x - p) = 0 -> ax + bc + cx + d == 0 + * <p> + * In order to work w/ {@link Frustum#isOutside(AABBox) isOutside(..)} methods, + * the normals have to point to the inside of the frustum. + * </p> + */ public static class Plane { /** Normal of the plane */ public final float[] n = new float[3]; @@ -121,7 +127,7 @@ public class Frustum { public static final int FAR = 5; /** - * Planes are ordered in the returned array as follows: + * {@link Plane}s are ordered in the returned array as follows: * <ul> * <li>{@link #LEFT}</li> * <li>{@link #RIGHT}</li> @@ -130,6 +136,10 @@ public class Frustum { * <li>{@link #NEAR}</li> * <li>{@link #FAR}</li> * </ul> + * <p> + * {@link Plane}'s normals are pointing to the inside of the frustum + * in order to work w/ {@link #isOutside(AABBox) isOutside(..)} methods. + * </p> * * @return array of normalized {@link Plane}s, order see above. */ @@ -155,6 +165,10 @@ public class Frustum { /** * Calculate the frustum planes in world coordinates * using the passed float[16] as premultiplied P*MV (column major order). + * <p> + * Frustum plane's normals will point to the inside of the viewing frustum, + * as required by this class. + * </p> */ public void update(float[] pmv, int pmv_off) { // Left: a = m41 + m11, b = m42 + m12, c = m43 + m13, d = m44 + m14 - [1..4] row-major |