The new auto-convex collision generated (V-HACD) will not work properly with some meshes to generate accurate collision.
Using a rounded single piece mesh the accuracy setting will not work at all no matter if it's set to 1.0 or 0.0 there will be no change, only a single collision hull will be generated. (This mesh is attached and easily reproducible) Using the SM_Rock (starter content) results in multiple hulls being generated depending on accuracy that is set.
Video attached to demonstrate both.
1. Open UE4
2. Import attached mesh (SM_Rounded)
3. Open in Static Mesh Editor
4. Change to Wireframe mode to easily see generated collision
5. Use the Auto Convex collision tab and set the accuracy to 0 and hit APPLY
6. Now Use the Auto Convex Collision tab and set the accuracy to 1.0 and hit APPLY
Results: Accuracy has no effect with this type of mesh. There will only be a single collision hull generated.
Expected: Using a higher accuracy should result in more collision hulls being generated to represent a more accurate mesh shape.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-17282 in the post.
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Component | UE - Gameplay |
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Affects Versions | 4.8, 4.9 |
Created | Jun 18, 2015 |
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Resolved | Jun 18, 2015 |
Updated | Jul 14, 2021 |