Deforming motion blurred point clouds do not render in Cycles HIP-RT when BVH timesteps != 0 #127131

New Issue

Alaska · 2024-09-04T08:34:23+02:00

Alaska commented

2024-09-04 08:34:23 +02:00

System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: AMD Radeon RX 7800 XT ATI Technologies Inc. 4.6.0 Core Profile Context 24.7.1.240711

Blender Version
Broken version: 4.3.0 Alpha, branch: main, commit date: 2024-09-03 20:56, hash: 0ef35bc47598
Worked: 4.2 as point clouds always crashed Blender with HIP-RT until 8cf4d47fe2

Short description of error
In 8cf4d47fe2 I noted that deformable motion blurred point cloud objects do not render when the BVH timesteps != 0. I am creating this report just so that issue can be tracked. Here are some images to demonstrate the issue

CPU	HIP BVH2	HIP-RT

Exact steps for others to reproduce the error

Change the render engine to Cycles and enable Motion blur.
Create a scene with a deforming point cloud object.
In Render Properties -> Performance -> Acceleration Structure increase BVH Time steps to something higher than 0.
Render the scene with HIP-RT and compare the results to other backends/BVHs.

Here is a file with steps 1-3 done for you. HIP-RT Motion blurred points.blend

**System Information** Operating system: Windows-10-10.0.22631-SP0 64 Bits Graphics card: AMD Radeon RX 7800 XT ATI Technologies Inc. 4.6.0 Core Profile Context 24.7.1.240711 **Blender Version** Broken version: 4.3.0 Alpha, branch: main, commit date: 2024-09-03 20:56, hash: `0ef35bc47598` Worked: 4.2 as point clouds always crashed Blender with HIP-RT until 8cf4d47fe2d1e2449cfd129ef9cbe619cf7a901d **Short description of error** In 8cf4d47fe2d1e2449cfd129ef9cbe619cf7a901d I noted that deformable motion blurred point cloud objects do not render when the BVH timesteps != 0. I am creating this report just so that issue can be tracked. Here are some images to demonstrate the issue |CPU|HIP BVH2|HIP-RT| |-|-|-| |![CPU.jpg](/attachments/a4e50a95-41e3-493e-974d-eab074c623ca)|![HIP.jpg](/attachments/ad177ed0-3701-4c35-a817-ff42c45011da)|![HIP-RT.jpg](/attachments/a9d79219-8519-49e5-a465-f871b3e976be)| **Exact steps for others to reproduce the error** 1. Change the render engine to Cycles and enable Motion blur. 2. Create a scene with a deforming point cloud object. 3. In `Render Properties -> Performance -> Acceleration Structure` increase `BVH Time steps` to something higher than 0. 4. Render the scene with HIP-RT and compare the results to other backends/BVHs. Here is a file with steps 1-3 done for you. [HIP-RT Motion blurred points.blend](/attachments/1c6c1318-2af6-4491-b498-c197aa6bb7bf)

HIP-RT.jpg

6.0 KiB

CPU.jpg

28 KiB

HIP-RT Motion blurred points.blend

902 KiB

HIP.jpg

28 KiB

Alaska added the

labels 2024-09-04 08:34:24 +02:00

~~Alaska referenced this issue 2024-09-04 08:35:02 +02:00~~

Cycles render test: Failing HIP-RT tests #125086

Alaska commented

2024-09-04 08:52:23 +02:00

Just for the record, curves seem to have the same issue, but that is currently being tracked in #125086.

I believe they might be the same issue, but haven't verified it, so I'm keeping them seperate for now.

Just for the record, curves seem to have the same issue, but that is currently being tracked in #125086. I believe they might be the same issue, but haven't verified it, so I'm keeping them seperate for now.

Pratik Borhade commented

2024-09-04 10:30:32 +02:00

cc @salipour

Pratik Borhade added

and removed

labels 2024-09-04 10:30:46 +02:00