public override Vector3 Shade(ShadeRec sr)
{
Vector3 wo = -sr.ray.dir;
Vector3 L = ambientBRDF.rho(sr, wo) * sr.context.ambientLight.L(sr);
int lightCount = sr.context.lights.Count;
for (int j = 0; j < lightCount; j++)
{
var light = sr.context.lights[j];
Vector3 wi = light.GetDirection(sr);
float nDotWi = sr.normal.Nor().Dot(wi.Nor());
if (nDotWi > 0)
{
bool inshadow = false;
if (light.CAST_SHADOW)
{
Ray shadowRay = new Ray(sr.localHitPoint + sr.normal * TracerConst.kEpsilon, wi);
inshadow = light.ShadowCheck(shadowRay, sr);
}
if (!inshadow)
{
L += light.L(sr) * nDotWi * diffuseBRDF.F(sr, wo, wi);
}
}
}
return(L);
}
public override Vector3 Shade(ShadeRec sr)
{
Vector3 wo = -sr.ray.dir;
Vector3 L = m_ambientBRDF.rho(sr, wo) * sr.context.ambientLight.L(sr);
int lc = sr.context.lights.Count;
for (int i = 0; i < lc; i++)
{
var light = sr.context.lights[i];
Vector3 wi = light.GetDirection(sr).Nor();
AreaLight al = light as AreaLight;
if (al != null && al.GEOMETRY.GetNormal(Vector3.Zero).Dot(wi) > 0)
{
//判定单向
continue;
}
float ndotwi = sr.normal.Dot(wi);
if (ndotwi > 0)
{
bool inshadow = false;
if (light.CAST_SHADOW)
{
Ray shadowRay = new Ray(sr.localHitPoint + sr.normal * TracerConst.kEpsilon, wi);
inshadow = light.ShadowCheck(shadowRay, sr);
}
if (!inshadow)
{
L += (m_diffuseBRDF.F(sr, wo, wi) + m_specularBRDF.F(sr, wo, wi)) * light.L(sr) * ndotwi * light.G(sr) / light.PDF(sr);
}
}
}
return(L);
}