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@@ -109,6 +109,15 @@ vec3 calculateIndirectIllumination(vec3 wo, vec3 n, vec3 base_color)
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109
109
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// Task 5 - Lookup the irradiance from the irradiance map and calculate
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110
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// the diffuse reflection
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111
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///////////////////////////////////////////////////////////////////////////
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112
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vec3 world_normal = vec3(viewInverse * vec4(n, 0.0));
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113
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float theta = acos(max(-1.0f, min(1.0f, world_normal.y)));
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114
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float phi = atan(world_normal.z, world_normal.x);
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115
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if(phi < 0.0f)
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116
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phi = phi + 2.0f * PI;
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117
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vec2 lookup = vec2(phi / (2.0 * PI), 1 - theta / PI);
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118
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vec3 Li = environment_multiplier * texture(irradianceMap, lookup).rgb;
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119
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vec3 diffuse_term = base_color * (1.0 / PI) * Li;
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120
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indirect_illum = diffuse_term;
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121
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///////////////////////////////////////////////////////////////////////////
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// Task 6 - Look up in the reflection map from the perfect specular
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