public override BSDF GetBSDF(ref Intersection intersection)
{
var bsdf = new BSDF(ref intersection);
bsdf.AddBxDF(_transmission);
return(bsdf);
}
public override BSDF GetBSDF(ref Intersection intersection)
{
var bsdf = new BSDF(ref intersection);
bsdf.AddBxDF(_lambertianReflection);
return(bsdf);
}
public override BSDF GetBSDF(ref Intersection intersection)
{
var bsdf = new BSDF(ref intersection);
bsdf.AddBxDF(_specular);
return(bsdf);
}
private SampledSpectrum SampleLights(Scene scene, BSDF bsdf, ref Intersection intersection,
ref Vector3 leaving)
{
var lights = scene.Lights;
var spectrum = SampledSpectrum.Black();
foreach (var light in lights)
{
var nsamples = _strategy == LightSamplingStrategy.Multiple ? light.NSamples : 1;
var lightContribution = SampledSpectrum.Black();
for (var i = 0; i < nsamples; ++i)
{
Vector3 incoming;
VisibilityTester visibilityTester;
var lightSpectrum = light.Sample(ref intersection.Point, scene, out incoming, out visibilityTester);
if (lightSpectrum.IsBlack() || visibilityTester.Occluded())
{
continue;
}
var cosangle = Math.Abs(Vector3.Dot(incoming, intersection.NormalVector));
// we get the light coming to us from transmission + reflection
var distribution = bsdf.F(incoming, leaving, BxDF.BxDFType.All);
// we scale the light by the incident angle of light on the surface and by the distribution
// function from light to us and we add it to the spectrum
lightContribution += distribution * lightSpectrum * cosangle;
}
spectrum += lightContribution / nsamples;
}
return(spectrum);
}
public override BSDF GetBSDF(ref Intersection intersection)
{
var bsdf = new BSDF(ref intersection);
//bsdf.AddBxDF(new LambertianReflection(_spectrum));
bsdf.AddBxDF(new SpecularReflection(new FresnelDielectric(1.23f, 1.0f)));
return(bsdf);
}
public override BSDF GetBSDF(ref Intersection intersection)
{
var bsdf = new BSDF(ref intersection);
bsdf.AddBxDF(new LambertianReflection(_kd));
//bsdf.AddBxDF(new SpecularReflection());
//bsdf.AddBxDF(new SpecularTransmission(1f, 1.14f, _kd));
return(bsdf);
}
