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Normal problem when using Morph Target


I'm trying to use morph target, to morph an hexagon into a cube. The problem is the resulting normal. In blender each vertex has 1 normal / face and I exported using Face smoothing group. I want to keep the hard edge, i tried many way to import but it's never the way I supposed it should be.

when importing the mesh: if I import normal from mesh, the normal are ok, the mesh looks not smooth, but when changing the weight, the normal are not updated or in a bad way. And the edge in the middle of the cube is visible.

if I use the unreal normal computation I loose the hard edge, and have some back artifact.

I spent so many hours trying to figure what's going on...

the mesh i'm using: https://github.com/Hekiat/Hekiat.github.io/blob/master/tmp/Tile_Test.fbx

thank you very much for any idea or response :)

alt text alt text alt text

Product Version: UE 4.22
normalpb.gif (1.3 MB)
normalpb2.gif (1.4 MB)
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asked Jul 10 '19 at 05:06 PM in Bug Reports

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answered Jul 12 '19 at 06:18 AM

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