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In the native Rhino Material editor Enscape only supports the basic materials in Rhino 5 and the custom materials in Rhino 6, with no blend or composite materials being supported there.
Rhino’s Material Editor in full can be found in the Rhino Knowledgebase.
This video will demonstrate how to use Enscape’s own Material Editor (currently SketchUp and Rhino 6 only), in addition to the native Rhino Material Editor, extends the range of what is possible in terms of materials and textures.
The video below demonstrates the general settings for material setup.
The video below shows you how to edite material inside Enscape.
huge database of textures, hdris, 3dscans
https://www.textures.com/
high quality ready to use textures
https://www.poliigon.com/
big collection of models, textures, cutouts
https://vwartclub.com/?section=xfree3d&category=3d+models
a library of 100 downloadable photoshop textures
https://www.archdaily.com/900268/a-library-of-100-downloadable-photoshop-textures