Rohan Dalvi Covers the Advantages of Using a Metalness-Roughness Approach to shader building Over Specular Glossiness.
I guess you can break down shading and rendering workflows into two basic camps. One is the specular and glossiness camp, with the other being the metalness-roughness approach. Both have their positive attributes, and one might even be considered more modern than the other. There are some reasons why you would want to use metalness-roughness over specular-gloss methods.
Houdini artist and trainer Rohan Davli offers a look into general shader building in SideFX Houdini, with a dive into how the metalness-roughness approach to shader building works. Rohan also discusses its advantages over the specular-gloss approach.
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