Changeset 2882 for code/trunk/src/bullet/BulletCollision/CollisionShapes/btHeightfieldTerrainShape.h

Timestamp:

Mar 31, 2009, 8:05:51 PM (15 years ago)

Author:

rgrieder

Message:

Update from Bullet 2.73 to 2.74.

File:

• code/trunk/src/bullet/BulletCollision/CollisionShapes/btHeightfieldTerrainShape.h (modified) (2 diffs)

code/trunk/src/bullet/BulletCollision/CollisionShapes/btHeightfieldTerrainShape.h

@@ -30 +30 @@
   center (as determined by width and length and height, with each
   axis multiplied by the localScaling).
+
+  \b NOTE: be careful with coordinates.  If you have a heightfield with a local
+  min height of -100m, and a max height of +500m, you may be tempted to place it
+  at the origin (0,0) and expect the heights in world coordinates to be
+  -100 to +500 meters.
+  Actually, the heights will be -300 to +300m, because bullet will re-center
+  the heightfield based on its AABB (which is determined by the min/max
+  heights).  So keep in mind that once you create a btHeightfieldTerrainShape
+  object, the heights will be adjusted relative to the center of the AABB.  This
+  is different to the behavior of many rendering engines, but is useful for
+  physics engines.
 
   Most (but not all) rendering and heightfield libraries assume upAxis = 1
@@ -89 +100 @@
         btVector3       m_localScaling;
 
-        virtual btScalar        getHeightFieldValue(int x,int y) const;
+        virtual btScalar        getRawHeightFieldValue(int x,int y) const;
         void            quantizeWithClamp(int* out, const btVector3& point,int isMax) const;
         void            getVertex(int x,int y,btVector3& vertex) const;