How to Merge Meshes in Unreal Engine 5

Merging can reduce draw calls and help with project optimization. There are 5 ways to do it. In this video, I demonstrate how to merge actors and static meshes.
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[@FeedingWolves]

This is great! Thank you!

[@HojDee]

Glad you liked it :)

[@luckycogstudios]

How does this help reduce draw calls?

[@HojDee]

Every meah is counted as 1 draw call. When you have 10 meshes that's 10 draw calls there. merging them (if it's possible) will make it 1 draw call. It especially usefull for distant meshes

[@PolySphere3D]

@@HojDee Unfortunately, this is not right. One mesh having 4 materials it will render 4 draw calls. 10 meshes of 4 materials it will render 40 draw calls. In this video, the group of meshes have 4 draw calls, after merging, they will have still 4 draw calls because they have 4 different materials. Only if they has the same material, the merging will reduce the draw calls to 1.

[@HojDee]

@@PolySphere3D from what I know and have read in different websites, a “basic” static mesh actor's total Draw Call is one for the mesh itself and 1 for each material slot. But I'd be happy if you provide a link that says otherwise.

[@PolySphere3D]

​@@HojDee I'm unable to provide direct links as it seems they might get deleted. However, you can verify this by conducting a test within the engine. Create multiple objects in an empty scene, each with distinct materials. Then, try merging them and observe that the draw calls won't see any improvement. You can monitor this by using 'stat RHI' or 'stat sceneRendering' commands." Then you can test it the case when the meshes shares the same material to see the improvment. 😁

[@HojDee]

@@PolySphere3D I'll try it and let you know about the result. But thanks anyways :)