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Tweak clearcoat wording & formatting a bit. #1776

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Merged
merged 3 commits into from
Mar 11, 2020
Merged

Tweak clearcoat wording & formatting a bit. #1776

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873ad2d
Tweak wording & formatting a bit.
emackey Mar 3, 2020
53c6fac
Merge remote-tracking branch 'origin/master' into clearcoat-tweak
emackey Mar 11, 2020
9e6bb43
Pulled out a sentence that was causing confusion.
emackey Mar 11, 2020
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5 changes: 3 additions & 2 deletions extensions/2.0/Khronos/KHR_materials_clearcoat/README.md
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Expand Up @@ -62,7 +62,7 @@ All implementations should use the same calculations for the BRDF inputs. Implem
|**clearcoatRoughnessTexture** | [`textureInfo`](/specification/2.0/README.md#reference-textureInfo) | The clearcoat layer roughness texture. | No |
|**clearcoatNormalTexture** | [`normalTextureInfo`](/specification/2.0/README.md#reference-normaltextureinfo) | The clearcoat normal map texture. | No |

The clearcoat formula `f_clearcoat` is computed using the specular term from the glTF 2.0 Metallic-Roughness material, defined in [Appendix B](/specification/2.0/README.md#appendix-b-brdf-implementation). Use F0 equal `0.04`, base color white `1.0, 1.0, 1.0`, metallic value `0.0`, and the clearcoat roughness value defined in this extension as follows:
The clearcoat formula `f_clearcoat` is computed using the specular term from the glTF 2.0 Metallic-Roughness material, defined in [Appendix B](/specification/2.0/README.md#appendix-b-brdf-implementation). Use specular F0 equal `0.04`, base color black `0.0, 0.0, 0.0`, metallic value `0.0`, and the clearcoat roughness value defined in this extension as follows:

```
clearcoatRoughness = clearcoatRoughnessFactor * clearcoatRoughnessTexture.g
Expand All @@ -74,7 +74,8 @@ The following abstract code describes how the base and clearcoat layers should b
clearcoatBlendFactor = clearcoatTexture.r * clearcoatFactor
clearcoatFresnel = fresnel(0.04, NdotV)

color = (f_emissive + f_diffuse + f_specular) * (1.0 - clearcoatBlendFactor * clearcoatFresnel) + f_clearcoat * clearcoatBlendFactor
color = (f_emissive + f_diffuse + f_specular) * (1.0 - clearcoatBlendFactor * clearcoatFresnel) +
f_clearcoat * clearcoatBlendFactor
```

If `clearcoatFactor` (in the extension) is zero, the whole clearcoat layer is disabled.
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