Radiometric Scale Factor Off By a Factor?

Renderer plugins apply a renderer-specific radiometric scale factor to renderings to bring multi-spectral images into units of radiance. The scale factors are computed with a utility that analyzes the results of a test scene.

We may need to update the utility to remove a factor of two, which we may have included by accident.

The correct conversion involves irradiance for a point at distance, which may be converted to radiance by:

irradiance = pi * radiance (correct)

It may be that we are using this incorrect conversion instead:

irradiance = 2pi * radiance (are we doing this by accident?)

So we should check our code and documentation to see if we need to make a correction:

in code, including existing renderer plugins, utilities, and example scenes
in our methods paper?
on our wiki?

This issue is about determining whether we have an error at all. If we do, we can make a separate issue about correcting it.

RenderToolbox / RenderToolbox3

Radiometric Scale Factor Off By a Factor? #36