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@@ -123,6 +123,24 @@ vec3 calculateIndirectIllumination(vec3 wo, vec3 n, vec3 base_color)
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123
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// Task 6 - Look up in the reflection map from the perfect specular
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// direction and calculate the dielectric and metal terms.
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///////////////////////////////////////////////////////////////////////////
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126
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+
vec3 wi = normalize(reflect(-wo, n));
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127
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vec3 wr = normalize(vec3(viewInverse * vec4(wi, 0.0)));
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128
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theta = acos(max(-1.0f, min(1.0f, wr.y)));
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129
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phi = atan(wr.z, wr.x);
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130
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if(phi < 0.0f)
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131
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phi = phi + 2.0f * PI;
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132
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lookup = vec2(phi / (2.0 * PI), 1 - theta / PI);
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133
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float roughness = sqrt(sqrt(2.0 / (material_shininess + 2.0)));
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134
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Li = environment_multiplier * textureLod(reflectionMap, lookup, roughness * 7.0).rgb;
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135
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vec3 wh = normalize(wi + wo);
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136
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float wodotwh = max(0.0, dot(wo, wh));
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137
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float F = material_fresnel + (1.0 - material_fresnel) * pow(1.0 - wodotwh, 5.0);
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138
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vec3 dielectric_term = F * Li + (1.0 - F) * diffuse_term;
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139
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vec3 metal_term = F * base_color * Li;
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140
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+
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141
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vec3 microfacet_term = material_metalness * metal_term + (1.0 - material_metalness) * dielectric_term;
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142
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+
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143
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indirect_illum = microfacet_term;
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return indirect_illum;
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}
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