Click on a point and drag left or right, up or down, to get a depth. Negative X or Y position reduces the Z-depth and positive X or Y increases the Z-depth. As the mouse moves around the canvas/window the page draws a line between the initial point and the current mouse point, with a depth value. When you release the mouse pointer we have an XYZ coordinate for a point in 3D space which we display with perspective tricks. I want to be able to pick a point in a volume and also rotate the points around the center of the volume.
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