public override ShadingInfo GetShadingInfo(Surfel surfel)
{
return(new ShadingInfo()
{
direction = Mathf.CosineSampleHemisphere(surfel.normal, Mathf.CreateSample()),
distance = float.PositiveInfinity,
color = color * intensity
});
}
public override float Sample(Surfel surfel, out Vector3 wi, Vector2 sample, out float pdf)
{
var wo = surfel.ray;
var up = surfel.normal;
wi = Mathf.CosineSampleHemisphere(up, sample);
if (Vector3.Dot(wo, up) < 0)
{
wi.Z *= -1;
}
pdf = sample.X;
return(Evaluate(wo, wi));
}
private Color TraceRecursive(Scene scene, Surfel surfel, int depth)
{
if (depth >= RenderConfig.rayDepth)
{
return(new Color(0f));
}
var p = surfel.point + surfel.normal * RenderConfig.bias;
var color = new Color(0f);
for (var i = 0; i < RenderConfig.numberOfRayPerLight; i++)
{
var dir = Mathf.CosineSampleHemisphere(surfel.normal, Mathf.CreateSample());
var ray = new Ray(p, dir);
if (Raycaster.Raycast(ray, out var hit))
{
var dot = Vector3.Dot(surfel.normal, dir);
color += dot * (directIntegrator.GetColor(scene, hit) + TraceRecursive(scene, hit, depth + 1));
}
}
return(color / RenderConfig.numberOfRayPerLight);
}
