creo4 config.pro option documentation for: ENABLE_OPENGL_SHADER 
enable_opengl_shader
yes
*
, no
Sets the graphics environment and its capabilities when you use the OpenGL accelerated graphics hardware. When you set this configuration option to yes
, the following advanced capabilities of the OpenGL are enabled:
HDRI lighting
Ambient occlusion effect
Order independent transparency effect
The display of advanced materials such as metal, ceramic, and rubber in the Shading With Reflections
mode