Manipulation

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Once a control point is placed in the scene, it can be changed like a normal object using the mouse. However, there are some peculiarities with control points: First, the manipulation is not issued on the geometry of the control point, but on its parameters. A scaling for example will change the tangent scale of the control point instead of the size for the visual representation of the control point. Second, the manipulation mode that can be applied to the control point depends on which part of the control point geometry the user has clicked.

Mode

Where to Click

Effect

Translate

(Shift key + dragging with the left or right mouse button)


The control point is moved along with the mouse cursor. The translation is done by pressing the Shift key and dragging the mouse with either the left or the right mouse button pressed.

Rotate

(Ctrl key + dragging with the left mouse button)


The control point orientation is modified, rotating the forward and up vector arrows around the control point sphere.

The rotation is done with a trackball method. Unlike the rotation of objects, the control point rotation is not bound to a certain axis and only the left mouse button is used.

Scale

(Ctrl + Shift key + dragging with the left mouse button)


The tangent scale is modified accordingly. Dragging the mouse away from the control point will increase the tangent scale, dragging the mouse towards the control point will decrease the tangent scale.

Smaller tangent scales result in narrower turns where larger tangent scales result in wider turns.