implement motion controllers and vr drawing with brush preview

src/app.cpp

@@ -116,6 +116,7 @@ void App::initAssets()
     sampler_stencil.create(GL_LINEAR, GL_REPEAT);
     sampler_linear.create(GL_LINEAR);
     m_face_plane.create<1>(2, 2);
+    //sphere.create<8, 8>(1);
     LOG("initializing assets load uvs texture");
     LOG("initializing assets completed");
 }