koobas.hobune.stream
ShadeSH9 always zero
I'm trying to write a per-pixel cel shader that uses ambient light. In my ForwardBase pass fragment shader I do
final.rgb += ShadeSH9(half4(UnityObjectToWorldNormal(f.normal), 1));
but whenever I disable all light except ambient in the scene, everything is drawn black. Everything in my scene uses my shader, and the lighting setup is a skybox with a sun directional light, and nothing else. I also tried to multiply instead of add in the line above and the result was black, so the ShadeSH9 call returns zero. The ambient intensity varies in script but is never zero. Any ideas what I could be doing wrong here?
I recommend you fly through the first few chapter of this
https://en.wikibooks.org/wiki/Cg_Program$$anonymous$$g/Unity
it wont take long. By the time you've done that you'll understand how to diagnose your blackness.
Given changes in shaders recently it wouldn't surprise me if you've simple omitted something you needed or not omitted something that was required to go. This is usually within the first few lines of shader setup.
I have the same issue. ShadeSH9 function returns zero if a skybox is selected as ambient source but it works with gradient and solid color as ambience.
did you solve it fafnir?
There is defenetly something fishy about the ShadeSH9, the documentation on it is sparse.
Something I just found out as well: if you haven't got Tags { "LightMode" = "ForwardBase" } at the beginning of your pass (before CGPROGRAM), ShadeSH9 will return zero.
I think I know! the ShadeSH9 can only sample a skybox is it is baked! try baking the scene and see if the ShadeSH9 picks up something
