I have a datasmith model which is too bid and detail. I want to merge to 1 actor and decimate the model to reduce the triangles. How can I do that?
You have different solutions.
If it is a CAD model you should start by reducing the triangle count by changing the tessellation settings.
To merge meshes:
depending what you want to do you can use merge actor functions Window/Developer tool/Merge Actors. Here you have two solution: one that merge actors while preserving material slots and triangle count. One that creates a proxy lod that will simplify mesh and bake materials.
You can also merge mesh using the modeling tools.
To reduce triangle count you can:
- generate lods on your mesh, and then set that the maximum detail is one of the lod: lod 1 or lod 2 instead of lod 0. Creating and Using LODs | Unreal Engine Documentation
- Since 4.27 there are modeling tools that allow you to do some triangles operation (simplify or remeshing) Unreal Engine 5’s modeling mode takes shape - Unreal Engine <= this is more 5.0 but you have some of those tools available in 4.27 already.