I have a set of Diffuse Irradiance Map encoded as Third Order Spherical Harmonics Coefficients. I am trying to use it as ambient diffuse light for my entire scene.
I am not sure if its possible to accomplish this goal with the built-in Sky Light or the Ambient Cubemap in a Post Process Volume.
I`ve also tried to create a material that computes the resulting pixel color for a given Set of Coefficients, but I was not able to use it effectively.
I would appreciate any tips or information that help me to accomplish this task.