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.

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 : Unreal Engine 4 Tutorial: Collision (english) - YouTube.

Best regards,

Thank you . 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?

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.

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?