Merge pull request #1776 from KhronosGroup/clearcoat-tweak

Tweak clearcoat wording & formatting a bit.

Author: emackey

extensions/2.0/Khronos/KHR_materials_clearcoat/README.md

@@ -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
@@ -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.