public Texture <Spectrum> GetSpectrumTexture(string n, Spectrum defaultValue)
{
var name = _geomParams.FindTexture(n);
if (string.IsNullOrEmpty(name))
{
name = _materialParams.FindTexture(n);
}
if (!string.IsNullOrEmpty(name))
{
if (_spectrumTextures.ContainsKey(name))
{
return(_spectrumTextures[name]);
}
throw new InvalidOperationException(string.Format("Couldn't find spectrum texture named '{0}' for parameter '{1}'", name, n));
}
var value = _geomParams.FindSpectrum(n, _materialParams.FindSpectrum(n, defaultValue));
return(new ConstantTexture <Spectrum>(value));
}