add demo to test soft body friction

examples/ExampleBrowser/CMakeLists.txt

@@ -359,6 +359,8 @@ SET(BulletExampleBrowser_SRCS
   ../DeformableDemo/GraspDeformable.h
   ../DeformableDemo/Pinch.cpp
   ../DeformableDemo/Pinch.h
+  ../DeformableDemo/PinchFriction.cpp
+  ../DeformableDemo/PinchFriction.h
   ../DeformableDemo/DeformableMultibody.cpp
   ../DeformableDemo/DeformableMultibody.h
   ../DeformableDemo/DeformableRigid.cpp

examples/ExampleBrowser/ExampleEntries.cpp

@@ -46,6 +46,7 @@
 #include "../RollingFrictionDemo/RollingFrictionDemo.h"
 #include "../DeformableDemo/DeformableRigid.h"
 #include "../DeformableDemo/Pinch.h"
+#include "../DeformableDemo/PinchFriction.h"
 #include "../DeformableDemo/DeformableMultibody.h"
 #include "../DeformableDemo/VolumetricDeformable.h"
 #include "../DeformableDemo/GraspDeformable.h"
@@ -188,6 +189,7 @@ static ExampleEntry gDefaultExamples[] =
 
         ExampleEntry(0, "Deformabe Body"),
         ExampleEntry(1, "Deformable-Deformable Contact", "Deformable contact", DeformableContactCreateFunc),
+        ExampleEntry(1, "Deformable-Deformable Friction Contact", "Deformable friction contact", PinchFrictionCreateFunc),
         ExampleEntry(1, "Deformable-RigidBody Contact", "Deformable test", DeformableRigidCreateFunc),
         ExampleEntry(1, "Grasp Deformable Cube", "Grasping test", PinchCreateFunc),
         ExampleEntry(1, "Grasp Deformable with Motor", "Grasping test", GraspDeformableCreateFunc),