How to transform 3D coordinate system to 2D coordinate system of Leap Motion?

[diamondvu]

Dear all,

Currently, I get the 3D position of hand's palm as below:

Leap::Hand hand = frame.hands().rightmost();
Leap::Vector position = hand.palmPosition();

Vector position is the 3D vector (x, y, z) and I want to transform this vector to 2D coordinate system of image. Do you know how to transform it?

Thank you so much for your help!

Best Regards,

[diamondvu]

Any one can help me?

[AlexColgan]

This may be a Stack Overflow type of question, as converting coordinate spaces is not a question unique to Leap Motion.

[diamondvu]

Thank you so much for your help!

Best Regards,

Hi Alex,

Because I think that it depends on some parameters of cameras. And I don't know that Leap Motion supports APIs to transform from 3D coordinate to 2D coordinate.
I read here at section " Mapping to 2D" https://developer-archive.leapmotion.com/documentation/java/devguide/Leap_Coordinate_Mapping.html

And I tried as below:
int appWidth = 800;
int appHeight = 600;

InteractionBox iBox = controller.frame().interactionBox();
Pointable pointable = controller.frame().pointables().frontmost();

Vector leapPoint = pointable.stabilizedTipPosition();
Vector normalizedPoint = iBox.normalizePoint(leapPoint, true);

float appX = normalizedPoint.getX() * appWidth;
float appY = (1 - normalizedPoint.getY()) * appHeight;

However, it is not correct to transform.