b3Solver -> pass pointer to source instead of 0 (was left over from a debugging session), thanks to David for the report

Break up clipHullHullConcaveConvexKernel into multiple stages, so it might 'fit' in Apple's OpenCL implementation
Implemented bvhTraversalKernel and findConcaveSeparatingAxis on CPU (debugging, possible future CPU version)

Demos3/GpuDemos/main_opengl3core.cpp

@@ -101,7 +101,7 @@ enum
 };
 
 b3AlignedObjectArray<const char*> demoNames;
-int selectedDemo = 1;
+int selectedDemo = 0;
 GpuDemo::CreateFunc* allDemos[]=
 {
 		//ConcaveCompound2Scene::MyCreateFunc,
@@ -247,9 +247,21 @@ static void MyMouseButtonCallback(int button, int state, float x, float y)
 }
 
 extern bool useShadowMap;
-
+static bool wireframe=false;
 void MyKeyboardCallback(int key, int state)
 {
+	if (key=='w' && state)
+	{
+		wireframe=!wireframe;
+		if (wireframe)
+		{
+			glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
+		} else
+		{
+			glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
+		}
+	}
+
 	if (key=='s' && state)
 	{
 		useShadowMap=!useShadowMap;