USD Hydra Render Engine #110765
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This tasks lists remaining work for the Hydra render engine, as a follow up to #100892 and #104712.
High priority:
Missing features:
Discrepancies between USD and Hydra (as seen in automated render tests):
Bugs:
PyC_UnicodeFromBytes
should be used instead ofPyUnicode_FromString
for file paths.Code cleanup (which should fix issues too):
BKE_camera_params
API to simplify camera code and share more with rest of Blender (#114370)_bpy_hydra
implementation topython/
folder to avoid accessing private functions of that module?Is there a plan for sharing geometry export code between Hydra and USD export? I'm noticing some differences right now-- for example that we use the mesh triangulation for Hydra but N-sided faces for the USD exporter. I imagine some of those differences might persist, but a lot of the code would be the same.
@HooglyBoogly that's what I asked for when reviewing this, but it seems difficult. See various comments in the code review.
Both the API and data are different. For example Hydra expects the mesh to be split into submeshes by material, and has an API that queries various attributes on demand rather than exporting everything. I think Hydra does not handle n-gons, except when using subdivision surfaces which is not implemented yet.
I think for geometry export specifically, the best we can probably do is to refactor the code to make its structure, names and behavior more consistent. There might be a bit of code that can be factored out and shared, but not much I think.
@brecht please add this to the list #110915
@DagerD I added it now, and also gave you the permission required to edit the issue description yourself for future things.
Hey hey, I am new to the blender dev space, sorry if this is the wrong place to put my question.
Is there currently support for color attributes such as
displayColor
being translated to primvars or is that something this issue aims to cover? I imported Pixar's "Kitchen Set" scene into blender, and I noticed that thedisplayColor
is being set as a vertex attribute; however, when using theHydra Storm
renderer, I don't see the colors set bydisplayColor
when rendering (this is the same when using a custom render delegate).@Elijah-Nicol that's "Per-vertex color attributes" in the list of missing features. I'm not sure if some other changes will be needed to make Storm use those colors or if it being named
displayColor
will be enough.@brecht I thought that was the case, just wanted to check! Do you know when the task of implementing "Per-vertex color attributes" will commence?
I don't have a timeline, that one will be hopefully be solved before 4.0 is out.