x() -> x or getX() or [0]

y() -> y or getY() or [1]
z() -> z or getZ() or [2]
w() -> w or getW() or [3]

make sphere-convex and sphere-compound collision work (still issues remaining)

demo/gpudemo/GpuDemo.h

@@ -38,9 +38,9 @@ public:
                     :useOpenCL(true),
                     preferredOpenCLPlatformIndex(-1),
                     preferredOpenCLDeviceIndex(-1),
-					arraySizeX(25),
-		arraySizeY(23),
-		arraySizeZ(23),
+					arraySizeX(15),
+		arraySizeY(15),
+		arraySizeZ(15),
 		m_useConcaveMesh(false),
 		gapX(14.3),
 		gapY(14.0),