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Can Collision Complexity affect performance?

Hi guys forgive me if this question has been asked a lot. I'm currently creating nature properties like rocks, for all of my rocks, I use UE4 to apply them collision, then I switch the general collision into either "Use complex collision as simple" or "Use simple collision as complex", I found, especially "Use complex collision as simple" can give the rocks very accurate collision, which I like it very much. The question is, will that affect my game performance? If yes, what kind of collision should I use for my rocks then? Convex? or just simplified collision? Assume that all of my rocks are like UE4 mannequin size. Sorry about my bad English. Thank you.

Product Version: UE 4.9
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asked Sep 26 '15 at 05:05 AM in Using UE4

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Hi ALTWang,

Yes, collision Complexity affect performance, I recommend you to watch this collision tutorial, this tutorial explains everything you need to know about collisions : https://www.youtube.com/watch?v=TTsAYpqHU-c.

Best regards,


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answered Sep 26 '15 at 07:20 AM

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avatar image ALTWang Oct 01 '15 at 12:43 AM

Thank you MyroG. I have watched that videos before, now I got a new question: if I compare convex hull collision with "Use complex as simple" collision, which one will affect the game performance more?

avatar image Jacky Oct 01 '15 at 01:04 AM

Depends on the triangle count of your mesh. I believe it would be more costly if the mesh's tri count is more than the generated convex hull.

avatar image ALTWang Oct 01 '15 at 01:06 AM

Does it meanif I have a mesh with 1000 triangle, then I should use convex hull for its collision? So I should use convex hull for collision if the mesh has less tri?

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