Handle intermixed volumes in OpenGL and OSPRay
Use the Wavelet source, pass it through the calculator to create a second variable - eg. coordX. Now put both in Volume Rendering mode. What you see using OpenGL reflects both. Now enable OSPRay and you see only one. Version 5.5.2.
According to Dave DeMarle: I'm not sure yet what the specific change was that enabled it, but intermixed volumes started "working" under GL in ParaView 5.1. I put quotes around working because I think this is simply doing post individual volume render alpha blending better than it used to. There are cases where that is not sufficient.