Grab the new update to mitsuba exporter form here.
What is new:
- lots of new parameters added for integrators (Irrandiance Cache is supported now too). Supported integrators for now: Direct Lightning, Path tracing, Volumetric path tracer (Simple and Extended), Adjoint particle tracer, Photon mapper.
- PNG and EXR film options added into camera, so you cant tweak exposure from inside blender, or use exr image, and tonemap it inside blender
- I replaced old point light with new spherical one – it is more natural, since it gives soft shadows and less fireflies.
- I did some more work on Mitsuba materials. Support for Irawan&Marschner woven cloth is added. For it to work user needs to download weave pattern description (eg. from Mitsuba download page), and after unpacking zip file, you should point Blender ‘Woven cloth’ material to one of cloth pattern description files.
Note: those files are using sets of parameters: (kd, ks) or (warp_kd, warp_ks, weft_kd, weft_ks). So depending on cloth type, you should use (kd, ks) or (warp_kd, warp_ks, weft_kd, weft_ks). Maybe if future I will find way, to determine from file, which parameter set to use.
Note2: I’m not sure if I have written about it, but lot of Mitsuba materials are using coefficient paremeters that use RGB in range from 0 to above 1. So in all of color pickers for eg. scattering coefficients, u can type in values above 1. This will be probably changed in future with use of multiplier instead.
Here are some images from plugin testing, and two personal sculpts. Sculpt shows Priscilla, from Claymore comix. Sculpted in Sculptris, rendered in Mitsuba, some paint-over done in GIMP GPS. Render time of priscilla was around 6 min, with Photon Mapping and Irradiance Cache enabled.
Well that is it for now. I hope everything is clear.