Object Space Triplanar

[jjejj87]

So…I got to this and got Diffuse, and Mask map working. But no matter what I do, I can’t seem to get the normal to work properly. Can someone kindly advise what I am doing wrong?

[bgolus]

You’re not doing anything wrong. Unity’s included Triplanar node when set to Type Normal only works when using world space. It’s totally broken if using object space and the object is rotated.

I posted a subgraph that implements the built in triplanar node in all ways, except that it assumes you’re using object space inputs. (A zip file with the graph is attached to the post in this link.)

Shadergraph triplanar object space normal mapping help

Because the bug is actually producing a NaN someplace, and Shader Graph's "Branch" node isn't actually doing a branch so NaNs can leak through it. A NaN is short for "Not a Number", and is what happens when the shader does some math that has no real number answer (divide by zero, square root of -1, etc). The ugly thing with a NaN is any math operations that includes a NaN results in a NaN, so since the "Branch" node is actually a lerp, if there's a NaN in one input the output is guaranteed to …

With Shader Graph 10+ you could take that sub graph and remove the last matrix multiply and normalize nodes and then change the Shader Graph’s Master Stack to expect object space normals instead of tangent space normals and make your shader a bit cheaper, not to mention have fewer interpolation artifacts.

Unity’s built in triplanar node really needs some extra options to define in what space it should assume the input values are in, and what space it should be outputting. As there’s no reason to always output tangent space normals now that the Master Stack can accept object or world space normals.

[jjejj87]

@bgolus

You’re not doing anything wrong. Unity’s included Triplanar node when set to Type Normal only works when using world space. It’s totally broken if using object space and the object is rotated.

I posted a subgraph that implements the built in triplanar node in all ways, except that it assumes you’re using object space inputs. (A zip file with the graph is attached to the post in this link.)
https://discussions.unity.com/t/712256/22

With Shader Graph 10+ you could take that sub graph and remove the last matrix multiply and normalize nodes and then change the Shader Graph’s Master Stack to expect object space normals instead of tangent space normals and make your shader a bit cheaper, not to mention have fewer interpolation artifacts.

Unity’s built in triplanar node really needs some extra options to define in what space it should assume the input values are in, and what space it should be outputting. As there’s no reason to always output tangent space normals now that the Master Stack can accept object or world space normals.

Thanks for the detailed reply! You are a true hero mate.

[koirat]

Hi, do we still need to create our own shader for triplanar object spaced mapping, or something moved forward ?
I’m asking since this sounds like such an obvious basic feature that should be build in already.