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The Options menu of the Surfaces tab provide options for using baked textures.
Use Baked Textures: When selected, will use baked textures if they are available. Deselect this option if you do not want to use baked textures. Deselecting this option will disable the next two options.
Auto Bake Textures: When selected, shaders will be automatically baked in the background as you work.
Refresh Baked Textures: When selected, will update the baked textures in the OpenGL viewport based on changes made to the shaders, lighting, and other options. This option must be selected each time you want to refresh the baked textures.