public static Light MakeLight(string name, Transform lightToWorld, ParamSet parameters)
{
switch (name)
{
case "distant":
{
var l = parameters.FindSpectrum("L", new Spectrum(1.0f));
var scale = parameters.FindSpectrum("scale", new Spectrum(1.0f));
var from = parameters.FindPoint("from", Point.Zero);
var to = parameters.FindPoint("to", new Point(0, 0, 1));
var dir = from - to;
return(new DistantLight(lightToWorld, l * scale, dir));
}
case "point":
{
var i = parameters.FindSpectrum("I", new Spectrum(1.0f));
var scale = parameters.FindSpectrum("scale", new Spectrum(1.0f));
var from = parameters.FindPoint("from", Point.Zero);
var l2w = Transform.Translate((Vector)from) * lightToWorld;
return(new PointLight(l2w, i * scale));
}
default:
throw new ArgumentException("Unknown light: " + name);
}
}
public static AreaLight MakeAreaLight(string name, Transform lightToWorld,
ParamSet parameters, Shape shape)
{
switch (name)
{
case "area":
case "diffuse":
{
var l = parameters.FindSpectrum("L", new Spectrum(1.0f));
var scale = parameters.FindSpectrum("scale", new Spectrum(1.0f));
var numSamples = parameters.FindInt32("nsamples", 1);
return new DiffuseAreaLight(lightToWorld, l * scale, numSamples, shape);
}
default:
throw new ArgumentException("Unknown area light: " + name);
}
}
public static AreaLight MakeAreaLight(string name, Transform lightToWorld,
ParamSet parameters, Shape shape)
{
switch (name)
{
case "area":
case "diffuse":
{
var l = parameters.FindSpectrum("L", new Spectrum(1.0f));
var scale = parameters.FindSpectrum("scale", new Spectrum(1.0f));
var numSamples = parameters.FindInt32("nsamples", 1);
return(new DiffuseAreaLight(lightToWorld, l * scale, numSamples, shape));
}
default:
throw new ArgumentException("Unknown area light: " + name);
}
}
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));
}
public static Light MakeLight(string name, Transform lightToWorld, ParamSet parameters)
{
switch (name)
{
case "distant" :
{
var l = parameters.FindSpectrum("L", new Spectrum(1.0f));
var scale = parameters.FindSpectrum("scale", new Spectrum(1.0f));
var from = parameters.FindPoint("from", Point.Zero);
var to = parameters.FindPoint("to", new Point(0, 0, 1));
var dir = from - to;
return new DistantLight(lightToWorld, l * scale, dir);
}
case "point":
{
var i = parameters.FindSpectrum("I", new Spectrum(1.0f));
var scale = parameters.FindSpectrum("scale", new Spectrum(1.0f));
var from = parameters.FindPoint("from", Point.Zero);
var l2w = Transform.Translate((Vector) from) * lightToWorld;
return new PointLight(l2w, i * scale);
}
default:
throw new ArgumentException("Unknown light: " + name);
}
}
public Spectrum FindSpectrum(string name, Spectrum defaultValue)
{
return(_geomParams.FindSpectrum(name, defaultValue));
}