Slide to adjust vertical distance between contours
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Left click to place a point on a contour line.
Right click to drag points around.
New points are added along the cyan when you left click.
Press the "New Contour" button or the scroll wheel to create a new contour line.
Press "Clear" to clear the canvas.
Use the sliders to adjust the angle of viewing of the 3d model.
Press "Rotate" to make the model spin and stop it spinning.
Click "Delete Contour", then click on a point to delete the contour line it is part of.
