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How do I ignore subtractive collision?

I convert a brush group into static mesh. But when I put collision on the object, I can still collide with subtractive brush.(colliding with air).alt text

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asked Mar 29 '14 at 01:11 AM in Using UE4

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rleiker13
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Hey rleiker13,

When you create your Mesh from a brush, are you then adding collision as Simplified Collision? If so, you're creating a collision box around your entire Mesh.

If you open your Mesh in the editor and set the Collision Complexity to Use Complex Collision As Simple, this will create collision based on the Mesh's faces, and won't place any collision around the hole in your Mesh. You need to be cautious with this, however, as a Mesh with many faces with Complex Collision on it will require much more calculation and may result in collision check fails. For something as simple as what you're showing, however, this should work fine.

An alternative would be to create the shape you're looking for from multiple Meshes, or to create individual blocking Volumes around your hole and use that for collision detection.

Hope that helps!

Ben Halliday

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answered Mar 29 '14 at 07:42 PM

avatar image rleiker13 Mar 30 '14 at 01:15 AM

Thx! i appreciate your help!

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