Guys ,
I know this question has been asked thousand time but damnn , I’m stuck with this huge problem of mine which must be the tiny for many but really really I feel so stupid to ask but I have to ask again.
I just bring a normal FBX file from blender which has a simple cube with red color as its material. When i import it into UE4 it shows perfect in the environment but as soon as I click the magic button “BUILD LIGHT” it becomes black mostly or in one try it became dull red.
I mean how in the hell this small issue has to be solved, I kept banging my head on like gazillioons of tutorials but this black point in my life for now is just not going at all.
What to do please help , SOS , anybody out there.
Looks like your like lightmap UVs need to be adjusted, check the UVs in the mesh editor window to see what they look like on channel 0 and 1.
For me in both channels it looks like a clear box outline there is nothing like what its looks in your image. Is that normal or abnormal?
That means you don’t have your UVs or lightmap UVs setup, you should create a set of unwrapped UVs like the ones above in blender. That will cure your issues, basically what is happening is the engine is putting a shadow on part of your mesh but without proper UV coordinates setup the mesh is completely covered by the shadow.
I checked someone mentioning to change the mobility value under transform section of the mesh to “movable” from “static”. Once i did this , all is working as it supposed to be. It solves the issue but I’m really thinking that even for a simple cube mesh which has just one color as material in blender, even for such mesh I need to create unwrapped UVs?
Yep that’s how UVs and lighting work…the engine needs that info in order to create and apply shadows correctly on the mesh
