Surface deform modifier says that convex polygons are concave in 0.01 unit scale scene #53398

Closed
opened 2017-11-26 20:05:10 +01:00 by Henrik Berglund · 4 comments

System Information
Win 8, GTX1070

Blender Version
Broken: 2.79 3f614cd (probably others too)

Short description of error

Surface deform modifier says that convex polygons are concave in 0.01 unit scale scene. See image: bug_surfacedeform_concavefaces.png
None of the angles are above 180 degrees which I thought was the definition of a concave face. Still, the modifier says that the target contains concave polygons. Note that this only happens in a 0.01 unit scale scene (custom scene scale is for Unreal Engine 4 compatibility).

I guess this means some mesh checking functions don't work in custom unit scale scenes which doesn't seem great.

Exact steps for others to reproduce the error

  1. Set unit scale to 0.01 metric.
  2. Create a plane. Rotate it and add a few subdivisions.
  3. Scale the top vertices out a bit.
  4. Create a cube. Add a surface deform modifier.
  5. Target the plane and bind. You get an error saying that the target contains concave polygons. (attached .blend file ends here)
  6. Set unit scale to 1 metric.
  7. Set the 3d cursor to the origin of the scene, set the pivot point to 3d cursor and scale down everything 100 times. Apply scale.
  8. Try binding the surface deform modifier again. Now it works.
    bug_surfacedeform_concavefaces.blend
**System Information** Win 8, GTX1070 **Blender Version** Broken: 2.79 3f614cd (probably others too) **Short description of error** Surface deform modifier says that convex polygons are concave in 0.01 unit scale scene. See image: ![bug_surfacedeform_concavefaces.png](https://archive.blender.org/developer/F1194021/bug_surfacedeform_concavefaces.png) None of the angles are above 180 degrees which I thought was the definition of a concave face. Still, the modifier says that the target contains concave polygons. Note that this only happens in a 0.01 unit scale scene (custom scene scale is for Unreal Engine 4 compatibility). I guess this means some mesh checking functions don't work in custom unit scale scenes which doesn't seem great. **Exact steps for others to reproduce the error** 1. Set unit scale to 0.01 metric. 2. Create a plane. Rotate it and add a few subdivisions. 3. Scale the top vertices out a bit. 4. Create a cube. Add a surface deform modifier. 5. Target the plane and bind. You get an error saying that the target contains concave polygons. (attached .blend file ends here) 6. Set unit scale to 1 metric. 7. Set the 3d cursor to the origin of the scene, set the pivot point to 3d cursor and scale down everything 100 times. Apply scale. 8. Try binding the surface deform modifier again. Now it works. [bug_surfacedeform_concavefaces.blend](https://archive.blender.org/developer/F1194030/bug_surfacedeform_concavefaces.blend)
Author
Member

Changed status to: 'Open'

Changed status to: 'Open'
Author
Member

Added subscriber: @cyaoeu

Added subscriber: @cyaoeu

This issue was referenced by a41fe949d8

This issue was referenced by a41fe949d8c346b246bdd1bff4ae50aee19ca859

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'
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Reference: blender/blender#53398
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