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Is it possible to create a cavity in a mesh collision?

i made a big static mesh, Its supposed to be a floating rock with a cave inside. I made a simplified version of it for collision and named it UCX_bigrock. In the world its floating so i couldn't have just made it out of terrain. The issue is UE4 deletes the cave part. it keeps the custom collision i made, but it just stitched up the opening for the cave and now its a flat surface. There are no holes in the mesh, its like if you took a play dough cube and pushed your finger in it, its still intact, theres just a cavity in it. i could understand why you wouldnt want this if you were say making a vase or an open box but this mesh is big enough for me to walk around on. i can see the entrance and everything but its closed up. if at all possible, how can i make ue4 keep the collision mesh i made, as is?

Product Version: UE 4.9
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asked Sep 07 '15 at 04:50 AM in Using UE4

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  1. make sure that you have disable "one convex hull per..." and "auto generate collision" in your import settings

  2. just use a per poly collision -> in the static mesh editor in the details panel set the collision mode to "use complex as simple" :)

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answered Sep 07 '15 at 04:19 PM

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avatar image PeteX Sep 07 '15 at 04:29 PM

Oh that's what use complex as simple means! I'd been wondering about that. :-)

avatar image Omninaut Sep 09 '15 at 09:07 PM

Thank You! Works perfectly

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