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ibl_sample_shader_lys
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ibl_sample_shader_lys [2017/05/15 17:13] adavies old revision restored (2017/05/15 17:11) |
ibl_sample_shader_lys [2017/05/23 03:49] (current) |
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| // form as cube maps convolved in Lys are based on RdotL and not NdotH. You can find | // form as cube maps convolved in Lys are based on RdotL and not NdotH. You can find | ||
| // a more detailed description in "Pre-convolved Cube Maps vs Path Tracers" | // a more detailed description in "Pre-convolved Cube Maps vs Path Tracers" | ||
| + | // Despite the difference in distribution of MIPs the lit specular response resulting from | ||
| + | // the “roughness texture” will be identical to existing PBR based game engines and tools. | ||
| float BurleyToMip(float fPerceptualRoughness, int nMips, float NdotR) | float BurleyToMip(float fPerceptualRoughness, int nMips, float NdotR) | ||
| { | { | ||
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| // material properties from texture | // material properties from texture | ||
| - | float smoothness = smoothness_tex.Sample(samLinear, st).x; // not gamma corrected | + | float smoothness = smoothness_tex.Sample(samLinear, st).x; // inverted roughness texture map (1-x) and no gamma correction |
| float perceptualRoughness = 1.0 - smoothness; | float perceptualRoughness = 1.0 - smoothness; | ||
| + | //float perceptualRoughness = roughness_tex.Sample(samLinear, st).x; // For those using roughness texture maps use this line instead to initialize perceptualRoughness. | ||
| float metalness = metalness_tex.Sample(samLinear, st).x; // not gamma corrected | float metalness = metalness_tex.Sample(samLinear, st).x; // not gamma corrected | ||
| float3 texNormal = 2*normal_tex.Sample(samLinear, st).xyz - 1.0; // not gamma corrected | float3 texNormal = 2*normal_tex.Sample(samLinear, st).xyz - 1.0; // not gamma corrected | ||
ibl_sample_shader_lys.1494868438.txt.gz · Last modified: 2017/05/23 03:49 (external edit)
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