The following took place in zbrush 4r4 p2:
I was working on a project where I was trying to match a 2d concept in 3d as pixel perfect as I could. I am aware of the mesh opacity options under the Texture> Image Plane> Reference views, but somehow on my last project, I was able to super impose my concept on the background with a grid and best of all, when I hit the trasnp button, my main subtool became transparent. I was then able to make it more transparent under the preferences> draw menu. This allowed me to match the concept much easier, quicker, and clearer than using the mesh opacity. I’ve been told that this is a bug, and have been unsuccessful in trying to duplicate the effect on my other projects, but this would be an extremely useful feature.
If this isn’t a bug and you do know a way I can replicate this effect please share with me! Here is my zpr if you would like to see exactly what I was able to do. Concept is by Yu Cheng Hong.
http://dl.dropbox.com/u/48082690/TransparencyBug.zip
