Hi! I'm pretty new to chai3d and I was trying to use the GEL module. In particular, I wanted to integrate rigid objects (cMultiMesh) and deformable ones (from the GEL module). The main problem is that when I try to touch the rigid portion on the body with the haptic device a strange vibration effect is generated...so it's like the forces computed for the deformable membrane and the effects established for the rigid body are superimposed. DO you think there is a way to solve this problem? Thanks in advance for your help.