Cycles HIPRT device #104110
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Reference: blender/blender#104110
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Known Issues
Background
HIPRT enables hardware ray tracing on AMD cards utilizing HIPRT SDK.
HIPRT SDK allows the developer to build the bvh on the GPU with different methods and trade-offs. It also allows for user defined primitives and intersection. The device side of the SDK provides traversal functions. In order to compile the kernels using traversal, the kernels must be compiled through the runtime compiler function that HIPRT SDK supplies.
HIPRTDevice and HIPRTDeviceQueue, derived from HIP, implement new functions or override existing functions to enable HIP ray tracing on the host. side.
Known issues and To-Dos:
The BVH builder doesn't efficiently handle degenerate triangles. For certain contents this might lead to performance slowdown or crash. We currently have a fix in HIP RT SDK to handle the crash, but the change is not yet part of our driver distribution.
Soft shadow on hair doesn't look right in certain cases. This seems to be a regression. Images from previous test results of the same scenes look correct. We are working to find the regression point.
Objects with motion blur are not rendered correctly. This is also a regression, and we have a rough idea of the change that broke motion blur.
Do you mean HIP-RT has no Linux support or Cycles' HIP renderer has no Linux support?
cause :
Queue up support one by one, c++ is not python
@salipour @BrianSavery is there any update on fixing the remaining issues? Besides Linux support which I understand will be for 4.0.
We still have 2 weeks for 3.6 bugfixes, and then 1 more week for fixes that are critical and relatively low risk.
I submitted changes for motion blur issue and some other minor bugs.
Differences with Hair and the other one with degenerate triangles are still in progress. I doubt for 3.6.
Thanks for the info.
@salipour can you submit that as a pull request targetting the
blender-v3.6-releasebranch?Any update? Shall I just merge these changes myself?
I'd leave out
-parallel-jobs=15, that kind of thing can make the buildbot run out of memory.oh! I thought I rebased. Is this pull request targeted properly to 3.6 bracnh?
Yes, it's targetted properly. Can you leave out the
-parallel-jobs=15part, update the title and add a description of the changes?Alright! I just pushed it.
Hi guys, any update on linux support for the HIP-RT?
Not much else, just a question: the BVH generator does not handle degenerate triangles efficiently. For some content, this may cause performance degradation or crashes. We have now fixed the crashing issue in the HIP RT SDK, but the change has not yet been incorporated into our driver distribution.
When will this entry be checked off in the task list?