public PathVertex CreatePathVertex(ref RayData ray, ref RayHit rayHit, Sample Sample)
{
PathVertex result = null;
bool missed = rayHit.Index == 0xffffffffu;
if (missed)
{
if (scene.EnvironmentMap == null)
{
result = new EnvironmentPathVertex() { IncomingDirection = -ray.Dir };
}
else
{
result = new ImplicitLightVertex() { IncomingDirection = -ray.Dir, Light = scene.EnvironmentMap };
}
return result;
}
var hitInfo = surfaceSampler.GetIntersection(ref ray, ref rayHit);
var hitPoint = ray.Point(rayHit.Distance);
var currentTriangleIndex = (int)rayHit.Index;
if (hitInfo.IsLight)
{
var lt = scene.GetLightByIndex(currentTriangleIndex);
result = new ImplicitLightVertex()
{
IncomingDirection = -ray.Dir,
Light = lt,
HitItemId = currentTriangleIndex,
Point = hitPoint
};
}
else
{
Vector wo = -ray.Dir;
float fPdf;
Vector wi;
bool specularBounce;
float u0 = Sample.GetLazyValue(), u1 = Sample.GetLazyValue(), u2 = Sample.GetLazyValue(), u3 = Sample.GetLazyValue();
var bsdf = hitInfo.MMaterial;
var throughput = RgbSpectrum.Unit;
RgbSpectrum f = bsdf.Sample_f(ref wo, out wi, ref hitInfo.Normal,
ref hitInfo.ShadingNormal, ref throughput,
u0, u1, u2, ref hitInfo.TextureData,
out fPdf, out specularBounce);
result = new GeometryVertex()
{
BsdfSampleWeight = fPdf,
GeometryNormal = hitInfo.Normal,
ShadingNormal = hitInfo.ShadingNormal,
HitItemId = currentTriangleIndex,
IncomingDirection = wo,
OutgoingDirection = wi,
Point = hitPoint,
Sample = f,
u0 = u0,
u1 = u1,
u2 = u2,
u3 = u3,
SampledBsdf = bsdf
};
}
return result;
}
public ExplicitLightVertex CreateLightVertex(Sample sample, GeometryVertex vertex)
{
int currentLightIndex = scene.SampleLights(sample.GetLazyValue());
var light = scene.Lights[currentLightIndex];
var ls = new LightSample();
light.EvaluateShadow(ref vertex.Point, ref vertex.GeometryNormal, sample.GetLazyValue(), sample.GetLazyValue(), sample.GetLazyValue(), ref ls);
if (ls.Pdf <= 0f)
{
throw new Exception();
}
/*
secRays[tracedShadowRayCount].color = new RgbSpectrum(ls.Spectrum);
secRays[tracedShadowRayCount].pdf = ls.Pdf;
secRays[tracedShadowRayCount].shadowRay = ls.LightRay;
Vector lwi = secRays[tracedShadowRayCount].shadowRay.Dir;
RgbSpectrum fs;
hitInfo.MMaterial.f(
ref secRays[tracedShadowRayCount].shadowRay.Dir,
ref wo, ref hitInfo.ShadingNormal, out fs, BrdfType.Diffuse);
secRays[tracedShadowRayCount].color *= lightTroughtput *
Vector.AbsDot(ref hitInfo.ShadingNormal, ref lwi) *
fs;
*/
return new ExplicitLightVertex()
{
};
}