Unknow visual issue with Baked normal!

[samueld28]

Hi, ill try to as clear as possible.

I am working on a kitchen island and have created a baked normal map from a high poly. I baked it in substance painter (See image from substance). Everything looks perfect back in substance but when i import the normal in 3ds max and try using it with corona it doesnt work! It messes up the shading and give those those weird artefact you see on the attach image. I tried flipping the green channel, made sure to override the gamma to 1.0, doesnt work. Its a tangent space normal map. (see attach image). My guess is that it has something to do with smoothing group of the low-poly. Before baking the normal i did a smoothing group based on UV shell, wich gives weird shading but remove any artefact in the baked. Those weird shading seems to the same as the artefact coming from the normal map. I  managed to get the same result from substance by not using the corona normal node. Why is that? I am completely in th dark here. If anybody encoutered this issue and could enlight me that would be great. I have included the 3ds maxfile and fbx file for better understanding.

Thanks!
-Sam

[romullus]

From the attached normal map, it looks like you've baked on the low-poly with single smoothing group (not the best idea for hard surface model). Remember that you can't alter smoothing groups after bake.

The reason, why it render "good" without CoronaNormal node, is because renderer treats your normal map as bump map that way, so you get shading from smoothing groups and some bump map on top. That is completely wrong usage, but if it works for you... :]

EDIT: i can't open your max files, but i've looked at your low-poly and high-poly objects and i got confused. What exactly do you try to bake here? Your high-poly isn't much more detailed than low-poly one. Besides smoothing on both models is mess - when you try to bake mess on mess, you get... mess? :]

[marobaro]

smoothing groups problem.

[samueld28]

Thansk for the answer gentleman, i will look further into that and comeback with the results!