If you use the layering materials, you can then use a simpler mechanism to set up passes.
- Select
OpenEXR image format from the
Render Settings window,
Common tab,
Image format drop-down list.
- Ensure that
RGBA (half)
Data Type is selected for the
Primary Framebuffer in the
Cameras section of the
Scene tab in the
Render Settings window.
- Expand the
Passes section in the
Primary Framebuffer section.
- Select each pass that you want to include; typically: Direct and Indirect Diffuse, Direct and Indirect Glossy/Specular which refers to reflection.
- After rendering, select
File > Load Render Pass in the
Render View window to open an alternate viewing window to see the passes. It only needs to be displayed once, if you want to reduce window clutter. Then use the
Layer menu in the
imf_disp window to select passes.
Additive Passes
These passes all add up to re-create the beauty pass. No multiplication is involved. They represent light hitting the eye from various light paths. If all potential light paths are represented, then the passes should add up to the final result.