OK, so all that sucks - but MR can achieve proper anisotropic shading of the hair primitive using the mib_illum_hair shader. In addition to this, MR doesn’t support OX’s volumetric shading or deep shadowing features, which when using scanline, definatly add to the realism of rendered hair. So oversmpling is often necessary to achieve soft, smooth hair renders. It seems like MR’s hair primitive is somewhat slower than the atmospheric methods used in OX and other hair renderers, in part to its’ being actual geometry.

Both max size and depth seem to be optimized by default for OX, changing either value to mr’s defaults both increase render time and lend very little to overall render quality.The default is 20.” (OX defaults to 24)īSP max size - (Taken from the MR 3.3 docs) “The max size defines the leaf size of the hair BSP tree that is created by mental ray to facilitate finding hairs during rendering. Look closely at the individual strands, notice the smoothness of each method where linear seems more accurate even with lower approximation values, and cubic is a bit more “chunky”.īSP max depth - (Taken from the MR 3.3 docs) “The max depth defines the depth of the hair BSP tree.Valid values are 1 (linear), 2 (quadric), or 3 (cubic).” (OX defaults to 2) Similar to spline interpolation, the more segments, the smoother the result.īezier Degree - (Taken from the MR 3.3 docs) “The degree is the degree of the Bézier curves that approximate each hair.This enables the use of the mr hair primitive.Īpproximation - (Taken from the MR 3.3 docs) “The approximate specifies the number of segments used to approximate each Bézier hair segment, if the degree is 2 or 3. So you want to render your hair with mr? Add the OX MR Hair object to your scene and select your source hair. I’ll try not to make this too off-topic, but there were a couple things I found interesting after reading thru the mr docs, and doing a little bit of experimentation. Having tried the “big 3” hair solutions, I’m leaning more and more towards Ornatrix, specifically for its’ mr integration. Alright guys, over the last couple of weeks I’ve been researching all the hairs stuffs out there for max.

Ornatrix hair with rigged geometry