Don't add the specular alpha in the model fragment shaders.
Merge branch 'master' of https://github.com/highfidelity/hifi
Check for texture translucency, render translucent mesh parts after opaque
ones, without alpha testing, and with back face culling enabled.
Didn't need to disable depth writes after all (for now).
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge pull request #1723 from ey6es/master

Fixes for translucent textures (such as that used in jellyhead.fbx).
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels