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Evaluate specular reflections using specular dominant direction instead of assuming mirror reflections

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clayjohn
2022-06-29 23:36:18 -07:00
parent ce6c4ab86a
commit 93c82ab4b9
4 changed files with 38 additions and 23 deletions
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28
servers/rendering/renderer_rd/shaders/scene_forward_mobile.glsl
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@@ -889,8 +889,10 @@ void main() {
vec3 anisotropic_normal = cross(anisotropic_tangent, anisotropic_direction);
vec3 bent_normal = normalize(mix(normal, anisotropic_normal, abs(anisotropy) * clamp(5.0 * roughness, 0.0, 1.0)));
vec3 ref_vec = reflect(-view, bent_normal);
ref_vec = mix(ref_vec, bent_normal, roughness * roughness);
#else
vec3 ref_vec = reflect(-view, normal);
ref_vec = mix(ref_vec, normal, roughness * roughness);
#endif
float horizon = min(1.0 + dot(ref_vec, normal), 1.0);
ref_vec = scene_data.radiance_inverse_xform * ref_vec;
@@ -940,6 +942,7 @@ void main() {
vec3 n = normalize(normal_interp); // We want to use geometric normal, not normal_map
float NoV = max(dot(n, view), 0.0001);
vec3 ref_vec = reflect(-view, n);
ref_vec = mix(ref_vec, n, clearcoat_roughness * clearcoat_roughness);
// The clear coat layer assumes an IOR of 1.5 (4% reflectance)
float Fc = clearcoat * (0.04 + 0.96 * SchlickFresnel(NoV));
float attenuation = 1.0 - Fc;
@@ -1036,6 +1039,19 @@ void main() {
vec4 ambient_accum = vec4(0.0, 0.0, 0.0, 0.0);
uint reflection_indices = draw_call.reflection_probes.x;
#ifdef LIGHT_ANISOTROPY_USED
// https://google.github.io/filament/Filament.html#lighting/imagebasedlights/anisotropy
vec3 anisotropic_direction = anisotropy >= 0.0 ? binormal : tangent;
vec3 anisotropic_tangent = cross(anisotropic_direction, view);
vec3 anisotropic_normal = cross(anisotropic_tangent, anisotropic_direction);
vec3 bent_normal = normalize(mix(normal, anisotropic_normal, abs(anisotropy) * clamp(5.0 * roughness, 0.0, 1.0)));
#else
vec3 bent_normal = normal;
#endif
vec3 ref_vec = normalize(reflect(-view, bent_normal));
ref_vec = mix(ref_vec, bent_normal, roughness * roughness);
for (uint i = 0; i < 8; i++) {
uint reflection_index = reflection_indices & 0xFF;
if (i == 4) {
@@ -1047,16 +1063,8 @@ void main() {
if (reflection_index == 0xFF) {
break;
}
#ifdef LIGHT_ANISOTROPY_USED
// https://google.github.io/filament/Filament.html#lighting/imagebasedlights/anisotropy
vec3 anisotropic_direction = anisotropy >= 0.0 ? binormal : tangent;
vec3 anisotropic_tangent = cross(anisotropic_direction, view);
vec3 anisotropic_normal = cross(anisotropic_tangent, anisotropic_direction);
vec3 bent_normal = normalize(mix(normal, anisotropic_normal, abs(anisotropy) * clamp(5.0 * roughness, 0.0, 1.0)));
#else
vec3 bent_normal = normal;
#endif
reflection_process(reflection_index, view, vertex, bent_normal, roughness, ambient_light, specular_light, ambient_accum, reflection_accum);
reflection_process(reflection_index, vertex, ref_vec, bent_normal, roughness, ambient_light, specular_light, ambient_accum, reflection_accum);
}
if (reflection_accum.a > 0.0) {