public void InitRenderer(Vector3D pos, Vector3D target)
{
// set eye and screen plane position
_origin = new Vector3D( 0, 0, -5 );
_p1 = new Vector3D( -4, 3, 0 );
_p2 = new Vector3D( 4, 3, 0 );
_p3 = new Vector3D( 4, -3, 0 );
_p4 = new Vector3D( -4, -3, 0 );
// calculate camera matrix
Vector3D zaxis = (target - pos).Normalize();
Vector3D up = new Vector3D( 0, 1, 0 );
Vector3D xaxis = up.CrossProduct( zaxis );
Vector3D yaxis = xaxis.CrossProduct( -zaxis );
Matrix m = new Matrix();
m[0] = xaxis.X;
m[1] = xaxis.Y;
m[2] = xaxis.Z;
m[4] = yaxis.X;
m[5] = yaxis.Y;
m[6] = yaxis.Z;
m[8] = zaxis.X;
m[9] = zaxis.Y;
m[10] = zaxis.Z;
m.Invert();
m[3] = pos.X;
m[7] = pos.Y;
m[11] = pos.Z;
// move camera
_origin = m.Transform(_origin);
_p1 = m.Transform( _p1 );
_p2 = m.Transform( _p2 );
_p3 = m.Transform( _p3 );
_p4 = m.Transform( _p4 );
// calculate screen plane interpolation vectors
_dX = (_p2 - _p1) * (1.0 / _width);
_dY = (_p4 - _p1) * (1.0 / _height);
// setup the tile renderer
_currCol = 0;
_currRow = 0; // 20 / Constants.TileSize;
_xTiles = _width / Constants.TileSize;
_yTiles = _height / Constants.TileSize; // (_height - 20) / Constants.TileSize;
// reset counters
Intersections = 0;
RaysCast = 0;
_twister = new Twister(0);
}
