Hi everyone,
I purchased a house asset from the Marketplace. Each house is a single Static Mesh, but it has more than 10 material slots (some of them have around 20 material slots).
Since I was worried about the high number of draw calls, I tried using Merge Actors → Merge Materials to create a new mesh with a single material.
However, after merging, the house looks much worse than the original. The textures become blurry and the overall quality drops significantly (see attached image).
I used a 2048 texture size for the merged material because I don’t want to increase the texture resolution too much and use more memory.
My questions are:
- What is causing this quality loss after Material Merge?
- Is there a way to keep the visual quality while reducing draw calls?
- For a project with around 20 different houses, each having many material slots, should I even be worried about performance?
- Would it be better to reduce the material slots manually (for example from 20 to 4–5) instead of merging everything into a single material?
I’m using Unreal Engine 5.
Any advice would be appreciated. Thanks!


