Autodesk / Autodesk/arnold-usd

Incorrect geometry light in instances

Open
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bug
Dominant language
Python
Stars
284
Forks
68
Avg merge
2d 19h
Merged PRs (30d)
14

Description

**Describe the bug**
If you make a geometry light in instances, the light still lights the scene but in incorrect position .

**To Reproduce**
Steps to reproduce the behavior:
1. Make a mesh a geometry light.
2. Set instance or not.
3. Render with Solaris viewport.
4. Here's a repro Houdini scene:[meshLight_instance.zip](https://github.com/Autodesk/arnold-usd/files/10683074/meshLight_instance.zip)

**Screenshots**
The only difference between the 2 scenes is that there is instanceable or not .
![Incorrect geometry light](https://user-images.githubusercontent.com/65776638/217464763-d8b0c3de-92d0-4fab-94d1-8230b2477b0e.jpg)
![correct geometry light](https://user-images.githubusercontent.com/65776638/217464778-047c19dd-8437-4953-8998-42ea29ee7234.jpg)

**Used Software Versions**
- HtoA 6.1.4.0

Contributor guide

Open the contributing guide

Research direction

Open meshLight_instance.zip in HtoA 6.1.4.0 and reproduce the comparison in the Solaris viewport with the mesh light instanced and non-instanced. Done means the instanced geometry light illuminates the scene from the correct position, matching the non-instanced result.

Written by the indexing model from the issue text.

Assessment

Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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