# Lightmap density issue on Floor blueprint **URL:** \ **Category:** Rendering\ **Tags:** baking, unreal-engine, Lightmap, Lighting, Blueprint, question\ **Created:** [October 14, 2020, 10:55pm UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940 "2020-10-14T22:55:54Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![AnP\_design](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AnP\_design](https://forums.unrealengine.com/u/AnP_design)\ **Post date:** [October 14, 2020, 10:55pm UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/1 "2020-10-14T22:55:54Z")
Hey Guys, I`m new here. There is some issue with lightmap density on the floor since I made it inside blueprint for realtime changeble materials. On the screenshot you can see the lightmap density is shows purple and it looks like dont have enoght sqares to catch lighting. So after baking lights there is so poor quality, cant see anything. Only the sun which is moveble. How could fix it inside bueprint? ![318747-2020-10-15-01-03-13.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/6/8/f68b6b6590683dc0cad2d7580209fab916291db5.png) ][2] ![318748-2020-10-15-01-32-52.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/d/1/dd171ab9b3fd54887ecab0eb9eebeafe193db1f3.png) ![318751-2020-10-15-00-52-08.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/c/7/cc79935b8e30442e1e2347fd4d04d00fb8f370ac.png) ---
**Author:** ![AnP\_design](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AnP\_design](https://forums.unrealengine.com/u/AnP_design)\ **Post date:** [October 14, 2020, 11:03pm UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/2 "2020-10-14T23:03:11Z")
![318719-2020-10-15-01-46-08.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/d/0/3d02fb0d19bf2711f2ea5331f9bf31acdc15ad65.png) here is floor blueprint itself if might be helphul ---
**Author:** ![Detach789](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Detach789](https://forums.unrealengine.com/u/Detach789)\ **Post date:** [October 14, 2020, 11:19pm UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/3 "2020-10-14T23:19:01Z")
This is kind of out of my knowledge, but are you sure you can bake lighting for materials that you are planning to change at runtime? Anyone know? ---
**Author:** ![ClockworkOcean](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/clockworkocean/32/1169999_2.png) [@ClockworkOcean](https://forums.unrealengine.com/u/ClockworkOcean)\ **Post date:** [October 15, 2020, 8:49am UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/4 "2020-10-15T08:49:03Z")
If it’s inside a BP, by definition it’s only getting dynamic lighting ( i think ). ---
**Author:** ![JorjiCostava](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JorjiCostava](https://forums.unrealengine.com/u/JorjiCostava)\ **Post date:** [October 15, 2020, 3:44pm UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/5 "2020-10-15T15:44:31Z")
Hey there! In your blueprint, select your floor static mesh component and on the right, in the Details panel, under Transform, set the Mobility to Static. That will allow static lighting to be built for floor. Additionally in that tab you can search for the Lightmap Density option if you want to override it. Hope that solves it! ---
**Author:** ![JorjiCostava](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JorjiCostava](https://forums.unrealengine.com/u/JorjiCostava)\ **Post date:** [October 15, 2020, 3:46pm UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/6 "2020-10-15T15:46:30Z")
Forgot to mention that you can set the Mobility for the entire blueprint to Static by selecting the different components and marking them Static. ---
**Author:** ![AnP\_design](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AnP\_design](https://forums.unrealengine.com/u/AnP_design)\ **Post date:** [October 16, 2020, 10:59am UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/7 "2020-10-16T10:59:45Z")
Thanks a lot! I will check this out! ---
**Author:** ![AnP\_design](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AnP\_design](https://forums.unrealengine.com/u/AnP_design)\ **Post date:** [October 19, 2020, 10:36am UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/8 "2020-10-19T10:36:45Z")
Thanks for your help! Got it ---
**Author:** ![MichaelMHD96](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@MichaelMHD96](https://forums.unrealengine.com/u/MichaelMHD96)\ **Post date:** [September 27, 2022, 8:51am UTC](https://forums.unrealengine.com/t/lightmap-density-issue-on-floor-blueprint/472940/9 "2022-09-27T08:51:16Z")
Oh man, I love you. Super super useful