[Radiance-general] Radiance output not satisfying radiosity equations

[Andrew McNeil]

Edward,

When I create ground truth renderings I pay close attention to the
following parameters:
-aa 0
-ad very high (like 10,000 - 50,000)
-lw between 1/ad and 1/ad^3

Also, if you're using large area illumination sources, use the glow
material instead of light material. If you're use light material for small
area sources pay attention to the direct sampling parameters (-d?).

Andy


On Wed, Sep 24, 2014 at 3:04 PM, Edward Zhang <edzhang at cs.washington.edu>
wrote:

> Hi,
>
> I'm working on an inverse rendering project and we're using Radiance to
> generate synthetic data for validation. Given a scene with diffuse
> surfaces, we're using the radiosity formulation as the core of our inverse
> process, namely that at any given scene point:
>
> radiosity at point = (reflectance at point) x
> sum_over_scene_points(radiosity at scene point x form factor between points)
>
> The sum is calculated using a hemicube method (with suitably high
> resolution) and the radiosities are obtained from reprojecting the .hdr
> outputs of Radiance onto the scene geometry.
>
> My problem is that even in simple box scenes this equation doesn't hold.
> Most of the time, the reflectance estimated from this equation is too low.
> I've used enough ambient bounces that the Radiance output has converged,
> but I'm wondering if there are other Radiance rendering options that might
> be causing these problems.
>
> Thanks for your help!
>
> Edward
>
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