Normal hard weird edges
Posted: Sun Apr 28, 2019 1:52 am
Hard edges in normal map.how can i fix this problem.
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Normal hard weird edges
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Re: Normal hard weird edges
Posted: Sun Apr 28, 2019 7:51 am
Can you post the scene ?
Re: Normal hard weird edges
Posted: Sun Apr 28, 2019 12:16 pm
My wild guess is that normal map doesn't respect Phong normals. So, Phong normal should be calculated first, then normal from map added. But it seems (I didn't read the actual code) that normal map added to surface normal, ignoring Phong interpolation.
Here's my example scene
Here's my example scene
Re: Normal hard weird edges
Posted: Sun Apr 28, 2019 3:59 pm
Use Normal Height value below 3 cm = 0.03.
eg. h = 3cm / without Subdivision, as you can observe artifact starts appearing
eg. h = 3cm / without Subdivision, as you can observe artifact starts appearing
Re: Normal hard weird edges
Posted: Sun Apr 28, 2019 5:56 pm
1.) As far as I know normal "Height" is not in meters, it's 0-100%. At 0 it's no change to initial normal; at 1 it's 100% added map value.
2.) My guess must be wrong, because at 0 Height the surface is smoothed.
No normal map, flat
No normal map, smoothed
Yes normal map, Height = 0
Yes normal map, Height = 1
3.) My another observation: it's the same faces that experience terminator problem are affected by the "normal map problem". Faces affected by terminator problem has sharp edges, but smoothed at the middle. With normal map they look flat.
Normal map
Re: Normal hard weird edges
Posted: Wed May 01, 2019 12:09 pm
Normal map Height = 2.45
~
No bump
~
Normal map Height = 0.3
~
https://github.com/LuxCoreRender/LuxCor ... malmap.cpp
If normal is pointing wrong way it is reversed?
No bump
Normal map Height = 0.3
https://github.com/LuxCoreRender/LuxCor ... malmap.cpp
Code: Select all
// Transform n from tangent to object space
Normal shadeN = Normal(Normalize(hitPoint.GetFrame().ToWorld(n)));
shadeN *= (Dot(oldShadeN, shadeN) < 0.f) ? -1.f : 1.f;
Re: Normal hard weird edges
Posted: Wed May 01, 2019 2:12 pm
Re: Normal hard weird edges
Posted: Wed May 01, 2019 3:57 pm
It's not 3 cm though.
When normal is pointing outward the camera is should be clipped at near perpendicular, not inverted.
Setting so-called "Height" multiplier doesn't solve anything.