# Material Merge makes my house mesh look very low quality. What am I doing wrong? **URL:** \ **Category:** Blueprint\ **Tags:** Optimization, unreal-engine, Blueprint, question\ **Created:** [June 21, 2026, 2:33pm UTC](https://forums.unrealengine.com/t/material-merge-makes-my-house-mesh-look-very-low-quality-what-am-i-doing-wrong/2730306 "2026-06-21T14:33:51Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![e7de84f7c71249dc8a21a7d1f05899f3](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/e7de84f7c71249dc8a21a7d1f05899f3/32/1063469_2.png) [@e7de84f7c71249dc8a21a7d1f05899f3](https://forums.unrealengine.com/u/e7de84f7c71249dc8a21a7d1f05899f3)\ **Post date:** [June 21, 2026, 2:33pm UTC](https://forums.unrealengine.com/t/material-merge-makes-my-house-mesh-look-very-low-quality-what-am-i-doing-wrong/2730306/1 "2026-06-21T14:33:51Z")
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). ![スクリーンショット 2026-06-21 232410](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/7/6/4762b19dad9344a8933f8258fa8be85f10d8105c.jpeg) 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. ![スクリーンショット 2026-06-21 232535](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/7/3/473bb9f4757f656ac17ef7066e3da919bc960abd.png) However, after merging, the house looks much worse than the original. The textures become blurry and the overall quality drops significantly (see attached image). ![スクリーンショット 2026-06-21 232817](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/1/1/61115efaa8d7c72f5876fa9192c86a5461cf65ab.jpeg) 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: 1. What is causing this quality loss after Material Merge? 2. Is there a way to keep the visual quality while reducing draw calls? 3. For a project with around 20 different houses, each having many material slots, should I even be worried about performance? 4. 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! ---
**Author:** ![XxpiingyxX](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@XxpiingyxX](https://forums.unrealengine.com/u/XxpiingyxX)\ **Post date:** [June 26, 2026, 12:10pm UTC](https://forums.unrealengine.com/t/material-merge-makes-my-house-mesh-look-very-low-quality-what-am-i-doing-wrong/2730306/2 "2026-06-26T12:10:39Z")
What happens if you try to set the resolution to 4k when you merge? I would say that 10-20 materials are way to much for one mesh. Performance gets affected by everything, and this will hurt especially i they do not use the same parent material. 20 materials/textures are a lot for an automatic process to merge, so it might be better to do it manually and make a new UV map.