Thanks Tom, did you save it with 1.7? - it crashes max on trying to open with 1.6, but opens fine with daily build installed. Anyway, there was no normal map texture with file, so i couldn't test what's wrong with RTT, but the model itself has big problems - first of all it has smoothing groups scattered all over the place and that's more than likely will cause problems with normal maps. What's more starnge, is that Corona RTT throws error message that model contains no triangles and it will not render. I tried all the tricks that i know to fix that, but the only one that helped was exporting model as OBJ and reimporting it back.
My conclusion at the moment is this: Corona RTT works fine, problem is in the model.
This is getting redicilous.
This bug is super obvious and we're now two pages in and you are still telling me that my model / normal is wrong. I appreciate the effort to help, but you need to stop telling me that I am so incompetent that I cannot create a properly baked normal mapped object.
It's disappointing that Corona staff is not commenting. The issue is readily apparent within 5 minutes of: baking a model with a normal map, and doing a RTT (Beauty map). Seams all over the place on the rendered texture.
With regards to your specific concerns:
1) The smoothing groups are scattered because
that is what you do for a normal baked model: you split the model by UV Seams. This is industry standard!!
This causes NO problems in any realtime engine: Unreal Engine 4, Unity, 3ds max with normal mapping shader. Not a single engine has any issues (you just commented on the sketchfab above, which has the exact same smoothing groups)
2) The model containing "no triangles" is because Max RTT tends to default to MatID/UV Set 3 for RTT. Set it to 1 (where the UV is) and it works without issue.
3) The Normal map is included in the previous .rar, where the file was in Max 2017 format. It's in DX Tangentspace (IIRC) - but try flipping green just to make sure (I can't recall off the top of my head)[/list]
