depth peeling shader code compile error
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
In VTK\Rendering\vtkOpenGLRenderer_PeelingFS.glsl, the targeted compiler version is 1.10, however it references sampler2DRectShadow which is a reserved word prior to version 1.40. But it also references global variables gl_TexCoord and gl_Color which are deprecated features as of compiler version 1.30. I think you need to target version 1.40, and you also need to enable compatibility mode in order to use the deprecated variables:
change "#version 110" to " #version 140" add " #extension GL_ARB_compatibility: enable"
When I try to use depth peeling, the shader compilation in VTK\Rendering\vtkOpenGLRenderer.cxx (near line 457) fails and so disables depth peeling unless I make the above changes.