Foliage: Speed tree wind is reset for every add/remove/update on instances
What is happening:
When adding new HISM instances, actors using SpeedTree -> WorldPositionOffset material are reset.
4.19 Repro project provided by user. I was unable to get WPO wind working in 4.18, I did noticed there was a change in the SpeedTree Material node from 4.18 to 4.19 (Inputs are exposed)
4.19, CL 4033788
4.20 Preview 5, CL 4173640
4.21 (UE4/Main), CL 4179794
4.19 Repro project attached.
1. Setup an actor with speedtree WPO material (wind)
2. Place WindDirectionalSource actor in level
3. Create a BP to add instances of wind-affected actor to level at a fixed interval.
Result: WPO (driven by wind) is reset when a new instance is added.
Expected: Individual instances WPO data is not reset.
Head over to the existingAnswerHub thread and let us know what's up.