if (orientation==Orientation.X1DOWN_X2RIGHT) {
_transpose23 = false;
_p12 = addPixels(1,0,s1,s2,slice12());
_p13 = addPixels(1,1,s1,s3,slice13());
_p23 = addPixels(0,0,s2,s3,slice23());
} else if (orientation==Orientation.X1DOWN_X3RIGHT) {
_transpose23 = true;
_p12 = addPixels(1,1,s1,s2,slice12());
_p13 = addPixels(1,0,s1,s3,slice13());
_p23 = addPixels(0,0,s3,s2,slice23());
} else if (orientation==Orientation.X1RIGHT_X2UP) {
_transpose23 = true;
_p12 = addPixels(1,0,s1,s2,slice12());
_p13 = addPixels(0,0,s1,s3,slice13());
_p23 = addPixels(1,1,s3,s2,slice23());
} else if (orientation==Orientation.X1RIGHT_X3UP) {
_transpose23 = false;
_p12 = addPixels(0,0,s1,s2,slice12());
_p13 = addPixels(1,0,s1,s3,slice13());
_p23 = addPixels(1,1,s2,s3,slice23());