Comments (2)
Here's an image to illustrate, hope it is helpful:
Top left is alpha=1.0, colored spec, spec amount 1.0 (so no diffuse) which already looks like silk. This is the basic formula for a metal material.
Top right adds in a second spec (alpha 0.05) for additional detail.
Bottom left is the default value of alpha=0.05 which is basically dielectric Fresnel and thus looks too dark with colored spec.
Bottom right is with diffuse color added to the dielectric spec. Looks more like plastic than silk.
TL;DR: As the image shows, the alpha slider is really helpful with shiny fabrics like silk.
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Is now exposed as of commit 4206da6.
Thanks!
Will try to change the ui in Maya later so it says uniform specularity, later. Thanks for the suggestion.
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