The Selection Preview section along the left side of the screen displays how the edges of the current selection line up when repeating the thumbnail contained in the selection, and serves to assist when creating the moulding/mat texture pattern.
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Rotate the Selection
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Rotate the selection to match the frame/texture/art angle.
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Rotation Definition
The Rotation function in Visualizationis the action of rotating the selected object(s) around an axis or center.