Have been working on compositing shots that are rendered out.
Some tips that I've picked up from video tutorial.
OpenEXR format
4 X 16 (Half): Usually good enough for passes that deals with colors, like the diffuse, specular and reflection.
4 X 32 (Full): Pretty much a must for data passes like Z depth and motion vector. Because you want these datas to be as accurate as possible.
So when rendering in Houdini, to render out un premultiplied images be sure to set the pixel filter to Closest Sampling Filtering (minmax min). Important to set that filtering for data passes!
Multi-layered EXR can slow down compositing softwares such as Nuke.
It might be a good idea to render out those layers as individual sequences.
Eg Nuke: Read in the file > Shuffle out the layers > Write Out
Using Nuke to write out the EXR files can be a good idea as well as Nuke is better at rendering openEXR format and the compression type is ZIP Scanline which is very efficient compared to tiling base compressions.
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