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Importing Collision from Blender (UCX method)

Hey guys/girls, I have run into a petty problem...

I am having real trouble importing custom Collision from Blender.. alt text

This is the object which I want to import in UE4 with collision. I duplicated the original mesh and named it as UCX_Tree.

alt text

Using these settings , I exported it from Blender. alt text

Using these settings I imported into UE4alt text

BUT the imported collision is like this.. Any ideas on how to get this rolling ?

P.S : I have also tried renaming it to UCS_Tree and MCDCX_Tree..

This has me stopped from progressing.. Thanks in advance for the help.

Product Version: UE 4.14
capture.png (28.5 kB)
captur2e.png (22.1 kB)
import.png (60.5 kB)
impcoll.png (137.0 kB)
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asked Jan 31 '17 at 08:14 PM in Using UE4

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Alrighty amigo, here's the issue and a fix!

The difference between your collision mesh in Blender and in UE4 is happening because all UE4 collision meshes must be entirely convex. See this article under the Collision section for more detail: UE4 FBX static mesh pipeline. When you import your collision into UE4 it is converting your mesh into an entirely convex one.

The way to make this work is to split your collision mesh in Blender (UCX_Tree) into multiple convex meshes. For instance, separate each bunch of leaves, the two branches and the trunk into individual meshes. For naming, you can add _# to each mesh (i.e. UCX_Tree_1, UCX_Tree_2, etc.). You can do some different naming conventions too, but Blender's standard .### for duplicates doesn't seem to work (unless you put an underscore first).

Let us know if that helps and works for you.

Nice tree by the way. Very fun.

Cheers and have a rootin' tootin' awesome day, -Noah

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answered Feb 02 '17 at 09:16 PM

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avatar image rovert821 Nov 17 '17 at 06:21 PM

This actually worked, but why cant unreal do this simple task automatically.

avatar image CorsairOfLight Jul 10 '18 at 06:15 PM

I absolutely agree.

avatar image Default816 Feb 17 '19 at 10:12 AM

@rovert821 because it is actually not such a "simple task" and it would be prone to errors, or at least i think that is their logic also. Take an object like an office chair, the algorithm would have to split up the collision into many boxes correctly placed. I would rather do that myself in 3 minutes than hope the auto collision would have the same precision

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