I want to render composite particles with halo material and meshes using Z buffers. The input files are .exr files. I have enabled Z and Combined in Render Layers. However when I try to composite them it seems that the particles Z buffer is empty. Can someone tell me what is going wrong?
My understanding is that unless your particles are instances of child objects, they will only be the size of a single vertex, even though they look bigger. They therefore don’t show up in the Z buffer.
On what I can see, I suppose you just duplicated the mesh and created the halo on the second one. If yes, it could be that the vertices share the same infos of Z-Depth, then all is wrong.
What if you scale up the halo’s mesh just a bit ?
Also, you can see what’s wrong using Viewer nodes directly connected to a Map Value node linked to Z.