de.javagl.swogl
Class PickingUtils

java.lang.Object
  de.javagl.swogl.PickingUtils

public class PickingUtils
extends java.lang.Object

Utility methods for picking

Method Summary

static Ray	computePickingRay(Camera camera, View view, int x, int y) Compute a picking Ray from the given screen coordinates based on the given Camera and View.
static Ray	computePickingRay(javax.vecmath.Matrix4f viewMatrix, javax.vecmath.Matrix4f projectionMatrix, java.awt.Rectangle viewport, int x, int y) Compute a picking ray given the view matrix, projection matrix, viewport and position.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

computePickingRay

public static Ray computePickingRay(Camera camera,
                                    View view,
                                    int x,
                                    int y)

Compute a picking Ray from the given screen coordinates based on the given Camera and View.

Parameters:

camera - The camera

view - The view

x - The x coordinate

y - The y coordinate

Returns:

The picking ray.

computePickingRay

public static Ray computePickingRay(javax.vecmath.Matrix4f viewMatrix,
                                    javax.vecmath.Matrix4f projectionMatrix,
                                    java.awt.Rectangle viewport,
                                    int x,
                                    int y)

Compute a picking ray given the view matrix, projection matrix, viewport and position. The view matrix contains the inverse of the matrix containing the rotation and translation for the camera. The projectionMatrix contains solely the perspective projection transformation. The viewport describes the rectangle that the picking occurs in. The x and y coordinates are the position where the picking ray should start, in screen coordinates.

Parameters:

viewMatrix - The view matrix

projectionMatrix - The projection matrix

viewport - The viewport

x - The x position

y - The y position

Returns:

The picking ray