Manual:Material Editor Custom Preview Scene

You can chose the object to be used in the texture preview thumbnail from a list of pre-defined objects or you can provide your own scene by choosing 'user defined' object. When you select 'user defined' preview, Bishop3D will export the texture or material selected for preview to the file custom_thumbnail_preview.inc, and tells POV-Ray to render the file custom_thumbnail_preview.pov, both in the temp folder under bishop3d installation directory. The file custom_thumbnail_preview.inc contains only the texture or material code. In the file custom_thumbnail_preview.pov you must provide the scene objects and lights and simply add the directive

where you want the exported texture or material definition to be. See the example below.