dariomanesku/cmftStudio

Does cmftStudio create diffuse irradiance / specular cube map?

bitinn opened this issue · 2 comments

bitinn commented

Sorry for this newbie question:

  • I am trying to figure out if cmftStudio does what IBLBaker can do.

  • In particular, I am trying to understand if the "irradiance" and "radiance" cube map it creates are the same as "diffuse irradiance" and "specular".

  • While the output DDS cube map looks fine, for some reasons they appear way too bright when applied in Maya.

For a comparison:

The diffuse cube map Maya uses by default seem rather faint.

screen shot 2017-09-07 at 00 14 40

screen shot 2017-09-07 at 00 14 45

And thus they result in quite different rendering.

screen shot 2017-09-07 at 00 14 54

screen shot 2017-09-07 at 00 15 05

I believe Maya's Stinyray PBS material does use PBR IBL, so my question is, are there somehow multiple implementation of IBL? Why would Maya requires a faint Diffuse and Specular map?

bitinn commented

The reason: they use RGBM as IBL encoding (pretty sure cmftStudio doesn't support in GUI yet.)

I change it to Linear sRGB instead.

dariomanesku commented

https://github.com/dariomanesku/cmft does support rgbm from the command line if you really need it. If my memory serves me well - rgbm was added later to cmft and the option didn't get exposed in cmftStudio's GUI in the end.