Studio Lighting shader. Where to find it?

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Hello guys

Was trying to find code for Studio Lighting shader in source code, but get losted.
So, where to find it?

2

it is called workbench_world_light_lib.glsl. It contains all the world lighting options for workbench and is included in other shaders (hence it is called a lib).

prep_specular(
        world_data.lights[0].direction.xyz, I, N, R, spec_NL[0], wrap_NL[0], spec_angle[0]);
    prep_specular(
        world_data.lights[1].direction.xyz, I, N, R, spec_NL[1], wrap_NL[1], spec_angle[1]);
    prep_specular(
        world_data.lights[2].direction.xyz, I, N, R, spec_NL[2], wrap_NL[2], spec_angle[2]);
    prep_specular(
        world_data.lights[3].direction.xyz, I, N, R, spec_NL[3], wrap_NL[3], spec_angle[3]);

Does the studio lighting.

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