| public Set ( double _x, double _y, double _z ) : void | ||
| _x | double | |
| _y | double | |
| _z | double | |
| return | void | |
protected void WarpSlice( int _ThetaHIndex, int _ThetaDIndex, double _Warp, ref Vector3 _Result )
{
double ThetaH = Math.PI * _ThetaHIndex / 180.0;
double ThetaD = Math.PI * _ThetaDIndex / 180.0;
double PhiD = Math.PI * _Warp / 180.0;
if ( PhiD > 0.5 * Math.PI )
PhiD = Math.PI - PhiD;
double Scale = ComputeScaleFactor( ThetaH, ThetaD, PhiD );
double ScaledThetaH = ThetaH / Scale;
double ScaledThetaD = ThetaD / Scale;
// int ScaledThetaHIndex = (int) Math.Min( 89, 89 * Math.Sqrt( 2.0 * ScaledThetaH / Math.PI ) );
// int ScaledThetaDIndex = (int) Math.Min( 89, 180 * ScaledThetaD / Math.PI );
int ScaledThetaHIndex = (int) (89 * Math.Sqrt( 2.0 * ScaledThetaH / Math.PI ));
int ScaledThetaDIndex = (int) (180 * ScaledThetaD / Math.PI);
if ( ScaledThetaHIndex > 89 || ScaledThetaDIndex > 89 )
{ // Out of range!
_Result.Set( 0, 0, 0 );
return;
}
_Result = m_BRDF[ScaledThetaHIndex,ScaledThetaDIndex,90];
// int U = _ThetaHIndex * INTERSECTIONS_TABLE_SIZE / 90;
// int V = _ThetaDIndex * INTERSECTIONS_TABLE_SIZE / 90;
// double C = m_Intersections[U,V];
// _Result.Set( C, C, C );
}
public static void half_diff_coords_to_std_coords( double _ThetaHalf, double _PhiHalf, double _ThetaDiff, double _PhiDiff,
ref Vector3 _In, ref Vector3 _Out )
{
double SinTheta_half = Math.Sin( _ThetaHalf );
Half.Set( Math.Cos( _PhiHalf ) * SinTheta_half, Math.Sin( _PhiHalf ) * SinTheta_half, Math.Cos( _ThetaHalf ) );
// Build the 2 vectors representing the frame in which we can use the diff angles
Vector3 OrthoX;
Half.Cross( ref Normal, out OrthoX );
if ( OrthoX.LengthSq() < 1e-6 )
OrthoX.Set( 1, 0, 0 );
else
OrthoX.Normalize();
Vector3 OrthoY;
Half.Cross( ref OrthoX, out OrthoY );
// Rotate using diff angles to retrieve incoming direction
Half.Rotate( ref OrthoX, -_ThetaDiff, out Temp );
Temp.Rotate( ref Half, _PhiDiff, out _In );
// ...or by mirroring in "Half tangent space"
double MirrorX = -_In.Dot( ref OrthoX );
double MirrorY = -_In.Dot( ref OrthoY );
double z = _In.Dot( ref Half );
_Out.Set(
MirrorX*OrthoX.x + MirrorY*OrthoY.x + z*Half.x,
MirrorX*OrthoX.y + MirrorY*OrthoY.y + z*Half.y,
MirrorX*OrthoX.z + MirrorY*OrthoY.z + z*Half.z
);
// if ( _In.z < -0.5 || _Out.z < -0.5 )
// throw new Exception( "RHA MAIS MERDE!" );
}
