#RENDERMAN TUTORIAL REALISTIC FREE#

Using the right Mean Free Path Distance is very important, or else we risk the rays going through the surface or not penetrating enough to have a considerable effect. We're assigning the painted color texture to the refraction color and the subsurface color and using the gain to control the intensity of each of these shading attributes.

For this, I made sure none of my base colors where absolute primary colors to avoid over exposure. One thing to keep in mind is color vibrancy when combining refraction and subsurface effects, or else we risk blowing out color. Since the candy came with nice UVs, I started with a simple color base in Mudbox. I knew I needed to do several layers of sugar, so I used Pixar Layer Surface for the candy material, which will give me more flexibility. This fractional value will leave a little bit of brute-force caustic generation. To generate caustics, we need to turn on 'Trace Light Paths' in our Dome Light, so that it emits photons.ДЇor faster (but biased) convergence, I used photon guiding, by setting it to 0.9 in the integrator settings. For this we are using RenderMan's bi-directional path tracer (VCM), which will give us photon-based caustics. Since the candy is extremely closeup and accuracy is important, I wanted to have realistic caustics instead of transparent shadows, which are more efficient but not physical.

Renderman tutorial realistic