I am playing around with the glTF2.0 materials in Shapediver. It appears we can now only use a MetallicRoughness Texture, which according to here: Metalness / Roughness
The metalness and roughness maps can be combined into a metalness-roughness map to use less textures. The blue channel is used for metalness, the green channel for roughness.
Can I ask why this complication? How can I create this map? Now I need to open Photoshop or some other tool to combine the 2 maps and even if I just want to use the roughness map I can’t just use a black and white image?
And all that to save one texture? I don’t understand the reasoning behind making it so difficult to experiment. If saving on textures is a concern, then why only combine those, but not others?
Is there no way in Grasshopper to use greyscale metalness and roughness maps like literally everybody else?