HIP-RT renders some instanced objects differently from other BVHs #117567

New Issue

Alaska · 2024-01-27T03:27:34+01:00

Alaska commented

2024-01-27 03:27:34 +01:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: AMD Radeon RX 7800 XT ATI Technologies Inc. 4.6.0 Core Profile Context 24.1.1.240110

Blender Version
Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: 9be62e85b727
Worked: NA

Short description of error
Certain scenes containing instanced objects will render incorrectly with HIP-RT when comparison against other BVH options. And example of such scene is the Secret Deer scene from here (Note: if you are testing the Secret dear scene, make sure you work around these issues first: #117565 and #117566).

BVH2 and most other BVHs	HIP-RT

Exact steps for others to reproduce the error

Download the attached .blend file.
Render the scene in Cycles with HIP-RT.
Render the scene again with a different BVH (E.G. Embree on the CPU).
Notice the difference between the renders.

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: AMD Radeon RX 7800 XT ATI Technologies Inc. 4.6.0 Core Profile Context 24.1.1.240110 **Blender Version** Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: `9be62e85b727` Worked: NA **Short description of error** Certain scenes containing instanced objects will render incorrectly with HIP-RT when comparison against other BVH options. And example of such scene is the Secret Deer scene from [here](https://www.blender.org/download/demo-files/) (Note: if you are testing the Secret dear scene, make sure you work around these issues first: #117565 and #117566). |BVH2 and most other BVHs|HIP-RT| |-|-| |![HIP.jpg](/attachments/32081f76-60e0-46fc-a9a6-726c37561ca0)|![HIP-RT.jpg](/attachments/ab205523-5248-4e68-ad61-4b79762988a5)| **Exact steps for others to reproduce the error** 1. Download the attached .blend file. 2. Render the scene in Cycles with HIP-RT. 3. Render the scene again with a different BVH (E.G. Embree on the CPU). 4. Notice the difference between the renders.

HIP-RT rendering issue.blend

242 KiB

HIP-RT.jpg

63 KiB

HIP.jpg

65 KiB

Alaska added the

labels 2024-01-27 03:27:35 +01:00

Alaska changed title from ~~HIP-RT renders Secret Deer scene extremely differently from other BVHs~~ to HIP-RT renders Secret Deer scene differently from other BVHs

2024-01-27 03:33:24 +01:00

Richard Antalik commented

2024-03-25 21:46:31 +01:00

Can this be demonstrated with simpler file? I only have integrated GPU (Vega8) and it runs out of memory. Alternatively I would say you can confirm these 3 reports, since you are developer...

Alaska commented

2024-03-26 02:25:20 +01:00

I have attached a simplified file to the original report, along with updating the description and images to represent the new file.

Alaska changed title from ~~HIP-RT renders Secret Deer scene differently from other BVHs~~ to HIP-RT renders some instanced objects differently from other BVHs

2024-03-26 02:25:34 +01:00

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HIP-RT renders some instanced objects differently from other BVHs #117567