The left pane : 3D view

This view shows the diffraction simulation environment consisting of the Ewald sphere, the reciprocal lattice and the diffraction screen.

Use the mouse to navigate in the scene.
To zoom in/out : hold CTRL or ALT key while dragging the mouse.
You can also use the wheel of your mouse.
To rotate the scene : hold SHIFT key while dragging the mouse.

The right pane : Projection view

This pane shows the projected pattern like a diffraction screen.
When a dot of the reciprocal lattice satisfies the Laue rule (graphically it meens that the point is exactly on the surface of the Ewald sphere), then a spot is projected to the screen.

You can drag the mouse to scroll the pattern.
To zoom in/out : hold CTRL or ALT key while dragging the mouse.
You can also use the wheel of your mouse.

You can can see the 'h k l' indexes of a spot by moving the mouse cursor over it.