I have been working on this file for a while and only ran into this issue today. I have a pretty large room that I am exporting from Revit to UE5 using Datasmith. In the past I havent had this but now there are multiple materials that are glowing when I don’t want them to. They have now emmissive settings active but shine like it is a light source. It happens with different materials and it happens when I put a similar material that doesn’t glow in instead and it still glows.
In the screenshot the whole door model is glowing but it has the exact same materials as the door on the right. But that one doesn’t glow. The glow on the top is from a window. The mullion material is glowing and its the same material as the windows on either side which arent’t glowing.
This only started this week and I have been working on this project since January of this year. Never ran into an issue like this.
For starters.
Where is the light source?
Can the model be lit by the lightsource?
For example, if you put a tree on a landscape with directional light, then put the light under the landacape as if it were night, the tree will glow since the bottom/inner hole of the mesh is lit.
Could be specific mesh settings, you can always delete it and add it back manually to check…
To avoid any extra light spill I have no light source besides the actual lights I have placed on the ceiling. I have reimported the file, I have re exported the datasmith file and reimported that. What is so weird is that it is only happening on the door and the window mullions. At least in that room. Another part of the model beyond the doors has stairs and the stairs are doing the same thing.
I have even tried a new project, a different computer. Nothing seems to work. And it was fine all of last week.
Are you sure there’s even a door rendered there? If the background is white, and the door is not rendered, that would bleed through.
Try deleting the door temporarily, and see if it works differently.
Other than that, which renderer are you using? Lightmass, Lumen, Ray tracing, … ?
Also:
This literally means that the emissive settings are now active, which in turn means that you should expect them to emit light. I assume that you meant “They have no emissive settings …” but, it’s harder to answer questions based on mind reading …
Yes there is a door there. I can see it there before I build the lighting. As for the renderer, I am using the default settings that are present when I open a new project. Looks like Lightmass. I haven’t messed with any of these settings before and haven’t had an issue.
For the emissive settings. The material is super basic both in parent and instance. The instance material only has a diffuse color active. All other effects and settings are unchecked and turned off. All it has is the color. But even if I change the diffuse color the material still glows that color as if it is active emissive.
Here is a screenshot of the material and all of the settings under the Details Panel.
And here is the window in the center that is glowing and the window to the right that isn’t glowing. As you can see both of them currently have the same material assigned but one glows and the other doesn’t.
I even just finished rebuilding the lighting again today to see if a computer reboot did anything. But this is the main issue I am having. Why is the material glowing on one model but not the other when they are both using the same material with limited settings active, none of which have anything to do with being emessive, and one glows like the sun and the other just acts normal???
You’re baking lights? I had a similar issue and was the uvmaps, for some reasons if are “wrong” sometimes you get a full black material, or most of the time, it glows like crazy.
I had a similar problem with a small apartament, three exatly same windows, duplicated from the same starting model, some glows and other don’t.
Check the uvs, or go dynamics and Lumen so you won’t need to bake lights.
Mind that if you’re looking for realistic images it pays a bit beign realtime, but you can activate pathtracer, and if you’re in 5.2 you can use Lumen hardware reflections that are much better.
You need static images or you’re planning on making videos?
Had the same glitch in 4.27 with microwave model. There were many microwaves in the room, but one of them started glowing after lighting bake. Placing it somewhere else would fix the problem, but it wasn’t an option. In the end I just had to make it movable.
