When an instance in a Hierarchical Instance Static Mesh component is rotated using "Update Instance Transform" it doesn't retain it's material's base color value when the material uses PerInstanceRandom.
NOTE: If the instance is also moved or scaled this repro fails.
WORKAROUND: If a very small number(0.0001f) is added to the transform location being updated then the initialized color is maintained.
Attached is a project that demonstrates this bug.
Found in 4.23 CL#9631420
Reproduced in 4.24 Cl#10570792, 4.25 Main CL#10611905
1. Create X number of instances in a HISM that are cubes.
2. Set the material of the instances to a material that creates a random color using PerInstanceRandom.
3. Create a call-in-editor function that only rotates the instances using the "Update Instance Transform" node.
Result: The instances are all black instead of whatever color they were initialized at.
Expected: The instances retain the colors that they were iniatilized with.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-85569 in the post.
| 12 |
| Component | UE - Graphics Features |
|---|---|
| Affects Versions | 4.23.1, 4.24, 4.25 |
| Created | Dec 9, 2019 |
|---|---|
| Resolved | Aug 27, 2021 |
| Updated | Aug 27, 2021 |
| 6439 - mamoniem |