Lighting darker/brighter on different systems - what is causing this?

Troubleshooting
1

Hi there,
i just ran into an issue and can’t figure out why it’s happening.
I have this simple test scene with some furniture models i found online - models are j3o (from obj), textures are TGA files (pretty big files), also specular and normal maps are TGA files. The scene uses an ambient light and a directional light. That’s basically everything in there - just a test scene. Now when i run the standalone build on my system (Win7), it looks like this:

CORRECT (apparently i am not allowd to put the images directly into my post…)

…which is exactly how it’s supposed to look. But today i tried the exact same build on two other systems (Win7 and MacOS) and on both systems (different machines, no VMs or such) it looks like this:

INCORRECT

There seems to be a lighting issue or it doesn’t apply the specular map, i don’t know. It’s just very dark.
Does anyone happen to have an idea? It confuses me that the scene is displayed differently on different machines…

Thanks a lot!

2

Might be your models don’t have tangents? Right-click the geometry in the SceneExplorer and select Tools->Generate Tangents or use the TangentBinormalGenerator from code.

3

Did you generate the tangents for the models?
If you use normal mapping, you need to have tangents on your model.

TangentBinormalGenerator.generate(geometry);

Without tangents, the result depends on what your cpu will use as default value for an unprovided buffer data.So it depends mostly on the drivers.

EDIT : rhoo ninja normen

4

Thank you guys for the quick help! I can’t test the result right now (as i am using the computer it worked with anyway), but both of you suggesting the same solution gives me a good feeling about this.
I will report back when had the chance to try it…

Thanks again!

5

Apparently the missing tangents were the problem - I generated them the way you suggested and now everything seems to be fine.
Once again, thanks for your help!

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