Am 15.03.2017 um 16:40 schrieb muyu:

> Now I am able to simulate the reflectance of 3D canopy using Pov-ray. However it
> seems a little bit underestimate compared with Monte Carlo approach (the
> reference dataset). I am wondering if physically radiosity based apprroach in
> Pov-ray ignore some processes. If not, how can I improve the accuracy of this
> estimation? Thanks in advance again.

and (in povray.beta-test):

> Thanks. I tested the back side illumination with radiosity. I am rendering a
> scene with very dense leaves. The objective is to get the physically accurate
> illuminace of each pixel. I set the assumed_gamma and file_gamma as 1.0. Then
> this the pixel color is supposed proportional to the illuminace? However, it
> seems the light does not propagate deep enough into the canopy (with radiosity
> and side diffused light). When compared with the reference results achieved with
> Monte Carlo method, the illuminace or reflectance is underestimated. I am
> wondering this is because Pov-ray ignore some physical processes or I did not
> set the right functions. Thanks again.

You may need to significantly increase the radiosity `recursion_limit`
setting.

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