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Make refraction math for environment map more accurate

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This commit is contained in:
Marco Buono 2023-04-16 17:54:13 -03:00
parent 5bfe6bb342
commit fd65d4bcd7
1 changed files with 8 additions and 2 deletions
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10
crates/bevy_pbr/src/render/pbr_functions.wgsl
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@ -341,10 +341,16 @@ fn pbr(
//
// NdotV = 1.0;
// f_ab = vec2<f32>(0.1)
// R = -refract(in.V, -in.N, 1.0 / ior)
// R = T // see definition below
// F0 = vec3<f32>(0.16)
// occlusion = 1.0
let transmitted_environment_light = environment_map_light(perceptual_roughness, roughness, diffuse_transmissive_color, 1.0, vec2<f32>(0.1), -in.N, -refract(in.V, -in.N, 1.0 / ior), vec3<f32>(0.16));
let T = -normalize(
in.V + // start with view vector at entry point
refract(in.V, -in.N, 1.0 / ior) * thickness // add refracted vector scaled by thickness, towards exit point
); // normalize to find exit point view vector
let transmitted_environment_light = environment_map_light(perceptual_roughness, roughness, diffuse_transmissive_color, 1.0, vec2<f32>(0.1), -in.N, T, vec3<f32>(0.16));
transmitted_light += transmitted_environment_light.diffuse;
transmitted_environment_light_specular = transmitted_environment_light.specular;
}