So I made a material which is just a grey colour but after I built the lighting these wierd patches appeared

Development Programming & Scripting Blueprint
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1

I did delete the directional lighting in the scene and the material is just a const3 running into base colour. there is also an emmisive texture on the same mesh

2

Can you show a pic?

3

image
here

4

Do you have a moveable skylight?

5

yes I do have one

6

Switch it to stationary.

7

Try turning that mesh to ‘movable’ real quick, it looks like you’ve just got a bit of low-res lightmaps going on there. If that does fix it, it means you should up the lightmap resolution and/or up the quality of the bake.
If that doesn’t work, try turning off “casts shadows” on the skylight, it looks like it could also be Distance Field errors.

8

Ok so I did that and after turning on the lightmap and turning on force no precompiled lighting it worked. Thanks for the help really appreciate it, would have taken me along time to figure it out without you.