Spectral range in SpectralFilm is overruled by constants in spectrum.h

[wvierber]

When using a SpectralFilm, adjusting "float lambdamax" [1050] and/or "float lambdamin" [330] does not result in the object being rendered outside of the 360-830 nm range. While there are channels for this extended spectral range outputted in the OpenEXR file, these are black.

Adjusting the constants in spectrum.h (to e.g. 330 and 1050) and recompiling PBRT does result in the object being rendered in the adjusted spectrum. It seems that the predefined visible spectral range overrules the arguments of SpectralFilm.

This can be reproduced using the scene and spectra used in debug.zip.