I have two question:
1) when I go to the materials lab and create a material for channel A, how to copy that to channels B, C and D?
Enter the Mat Lab and press ‘control’ whilst creating a blob in channel A then drag across so the blob also fills in channel B and C (first picture below outlined in red marked A)
Three mini previews are now available in the right hand section.
Click ‘Shift’ whilst clicking on the title at the top of the mini preview (first picture below outlined in red marked B)
This will open up your basic material library.
Choose the material you wish to work with (second picture outlined in red marked C) then hit the tick to confirm.
Repeat with channel B and C
You now have all three channels containing the same material (though why you’d want to do that is beyond me).
If the material you are wanting to use isn’t in this library, simply select an object that has the correct material and go to the Mat Lab, then do basically the same thing by clicking on the mini preview title bar while holding the ‘shift’ key down and in the library window, click ‘add’ (second picture outlined in red marked D) as you would to add anything to any of the libraries. It will now be there for you to use at any time in the future.
2) I watched a video made by David B. and it seems, when he makes textures, he likes to use the Channel C for that. Why not A, B or D?
Sorry, I’m not really following what you’re saying here… I only hope Rashad has nailed it for you.
Click thumbnail to see full-size image