We will be pushing out a large graphics engine update in the next couple of hours. One of main fixes within this update is Material Transparencies. This will result in the ability to build much more efficient content. We have been testing the update across various domains for issues and believe we have caught anything obvious. If you find other issues that get introduced, let us know.
The fixes to transparencies will do the following:
Multi layered trasparent materials
Image of a brain:
After (Note: specularity, maintaining spherical look)
After (Note: correct stacking of the materials)
More details can be found here: https://github.com/highfidelity/hifi/pull/5080