public override bool getSample(RayContext rayContext, double ru, double rv, out Vector3 wi, out double invPdf)
{
Vector3 viewDir = rayContext.ray.dir;
Vector3 normal = rayContext.hitData.hitNormal;
Vector3 reflectDir = viewDir - (normal * (normal * viewDir) * 2.0);
reflectDir.normalize();
Matrix3 shadingMatrix = new Matrix3();
shadingMatrix.computeTangentBasis(reflectDir);
double pdf = 1;
invPdf = 1;
wi = MathUtils.getSpecularDir(ru, rv, glossy, out pdf);
wi = shadingMatrix.transformVector(wi);
wi.normalize();
if (pdf < 0.0001)
return false;
invPdf = 1.0 / pdf;
double cosT = rayContext.hitData.hitNormal * wi;
if (cosT < 0.0)
return false;
return true;
}
public Matrix3 getInverted()
{
Matrix3 res = new Matrix3();
double det = m[0] * ( m[1] ^ m[2] );
//if(det==0.0f) //error
res.setRow(0, (m[1]^m[2]) / det);
res.setRow(1, (m[2]^m[0]) / det);
res.setRow(2, (m[0]^m[1]) / det);
return res;
}