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/PhysicsServerExample.cpp

@@ -2169,7 +2169,7 @@ void	PhysicsServerExample::updateGraphics()
 															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];