Normal map wrong lighting

Maximum-Dev · July 29, 2016, 2:51pm

hello,

I have this 3Planar function which uses world space tiling:

This is how the function is used on this cube:

As you see the directional light is casting light from front and the normal map shading is correct:

But when the cube is in this instance 180 degree rotated the normal map behavior doesn’t stay correct and shading is also (180 degree rotated?)

Where is the problem?
Thanks in advance!

Chosker · July 29, 2016, 3:43pm

the function is wrong

IIRC it’s also not doing proper math to determine proper shading on the sides (rotating a normalmap is not a trivial issue)

RyanB · July 29, 2016, 4:02pm

For the top face, most likely you just need to uncheck bTangentSpaceNormal. If you are using world coords it should not matter how the mesh is oriented if your normal is set to world space.

anonymous_user_c94f194d · July 29, 2016, 4:12pm

I recently made this material function to optimize performance and quality of triplanar mapping. Normal maps need to be transformed to common space(world) before blending. After that it can be transformed back to tangent space if needed.



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Maximum-Dev · July 29, 2016, 5:01pm

The problem with default one is each projected side receives light distinctly different from the other.

This is how the default function looks like:

This is also present in the custom setup [MENTION=37019]Jenny Gore[/MENTION] but it’s reduced.

A view from side (The triangle in the middle, half the sphere, should be lit but it’s not):

RyanB · July 29, 2016, 5:37pm

You guys should just use WorldAlignedTextures_Complex, it handles all that.

Yes the problem with the default one is that it is just doing swizzles instead of full transforms to make it cheaper, but it basically is like projecting the normals from a box onto the sphere. The _Complex node does a better method that looks smooth on spheres.

The regular normals one has a _HQ option but last time I tried it out it wasn’t working like the _complex one.

Maximum-Dev · July 29, 2016, 5:57pm

That has it’s own problem, reflections appear on wrong places

RyanB · July 29, 2016, 5:59pm

There must be something else going on since I just got done looking at materials for the automotive stuff and upgrading them to use this node and we carefully checked in many lighting conditions. It was working correctly.

Looks like your entire normals are rotated 90 degrees or worse there due to the lack of backface attenuation matching the shadow line.

I don’t think you ever replied on my comment about unchecking bTangentSpaceNormal. Did you look at that?

Maximum-Dev · July 29, 2016, 6:29pm

I apologize I missed that. Tangent normals unchecked along with _Complex node produces the results I was after.

Thanks.

anonymous_user_c94f194d · July 29, 2016, 9:41pm

My function is 100% correct. When using that you need to choose either worldspace normal output and uncheck the tangent space toggle(cheaper) or you can take tangent space output and leave the checkbox to default. Could you post image of gbuffer normal visualization?