private void Dump()
{
FileInfo formFactorSegmentsFile = targetDirectory.File(Scatterer.FormFactorSegmentsFilename);
FileInfo formFactorElementsFile = targetDirectory.File(Scatterer.FormFactoryElementsFilename);
if (formFactorElementsFile.Exists && formFactorSegmentsFile.Exists)
{
return;
}
Console.WriteLine("Dumping scattering form-factors...");
ScatteringFormFactorCalculator formFactorCalculator = ScatteringFormFactorCalculator.Make(figure.Geometry);
//Note on units:
// Daz uses units of cm for its "distance of measurement" volume parameters
// Therefore, the calculted MeanFreePathLength is also in cm
// And therefore, the radius and distance values passed to the scattering calculator must also be in cm
PackedLists <WeightedIndex> redFormFactors = CalculateFormFactorsForColorComponent(formFactorCalculator, materialSettingsArray, 0);
PackedLists <WeightedIndex> greenFormFactors = CalculateFormFactorsForColorComponent(formFactorCalculator, materialSettingsArray, 1);
PackedLists <WeightedIndex> blueFormFactors = CalculateFormFactorsForColorComponent(formFactorCalculator, materialSettingsArray, 2);
var formFactors = Vector3WeightedIndex.Merge(redFormFactors, greenFormFactors, blueFormFactors);
targetDirectory.CreateWithParents();
formFactorSegmentsFile.WriteArray(formFactors.Segments);
formFactorElementsFile.WriteArray(formFactors.Elems);
}
private PackedLists <WeightedIndex> CalculateFormFactorsForColorComponent(
ScatteringFormFactorCalculator formFactorCalculator,
IMaterialSettings[] materialSettingsArray, int componentIdx)
{
var profiles = materialSettingsArray
.Select(baseMaterialSettings => {
UberMaterialSettings materialSettings = baseMaterialSettings as UberMaterialSettings;
if (materialSettings is null)
{
return(null);
}
if (materialSettings.thinWalled)
{
return(null);
}
var volumeSettings = new VolumeParameters(
materialSettings.transmittedMeasurementDistance,
materialSettings.transmittedColor[componentIdx],
materialSettings.scatteringMeasurementDistance,
materialSettings.sssAmount,
materialSettings.sssDirection);
ScatteringProfile profile = new ScatteringProfile(
volumeSettings.SurfaceAlbedo,
volumeSettings.MeanFreePathLength);
return(profile);
})
.ToArray();
PackedLists <WeightedIndex> formFactors = formFactorCalculator.Calculate(profiles);
return(formFactors);
}
