add segmask_linkindex.py example using p.getCameraImage(320,200,flags=p.ER_SEGMENTATION_MASK_OBJECT_AND_LINKINDEX)

to extract object unique id and link index from segmentation mask in getCameraImage

examples/SharedMemory/PhysicsClientExample.cpp

@@ -940,7 +940,7 @@ void	PhysicsClientExample::stepSimulation(float deltaTime)
                                                         btVector4(32,255,255,255)};
                                 if (segmentationMask>=0)
                                 {
-									int obIndex = segmentationMask&(0x1e24-1);
+									int obIndex = segmentationMask&((1<<24)-1);
 									int linkIndex = (segmentationMask>>24)-1;
 									
 									btVector4 rgb = palette[(obIndex+linkIndex)&3];