Hi @loyang ,
could you provide , please, an example where you have an issue with the back facing polygons According a definition in
https://www.khronos.org/opengl/wiki/Face_Culling
Triangle primitives after all transformation steps have a particular facing. This is defined by the order of the three vertices that make up the triangle, as well as their apparent order on-screen. Triangles can be discarded based on their apparent facing, a process known as Face Culling.
... further ...
Face culling allows non-visible triangles of closed surfaces to be removed before expensive Rasterization and Fragment Shader operations.
To activate face culling, GL_CULL_FACE must first be enabled with glEnable. By default, face culling is disabled....
currently there is no supported way to have direct change of the OpenGL setting , so that this is valid change for preview mode but also for the mobile devices. The option what we have to use GLSL for preview and mobile or HLSL for the HoloLens device is to use vertex and fragment shaders. When we use a GLSL no all openGL variable are passed to the shader. Also the outputsof the shaders will effect only few openGL variables like gl_Position (past to the fragment shader) and gl_FragColor (result of the display) variable are passed to the shaders and also few variable could be changed by the shaders
We can apply shaders to any widget to change the display of them. Or try to optimize the display (the current shader is already a good optimization so far) or to change the display showing some feature like medium flow, gradients etc. Also default widget shaders used in Studio ,so far I know will not display any tessellated surfaces , therefore in the normal case we do not have the requirement to perform extra face culling
Therefore it will be interesting to know why do you need extra setting of back facing culling, or with other words where do you have an issue where this causes Problems with the display? Thanks
