(Images generated by SDM)

In SDM, users may directly manipulate object set parameters through object handles. Direct manipulation refers to operating directly on objects instead of through menus or dialogues. In contrast to manipulating an external object (such as a lens), SDM allows users to control an object set by directly controlling any element within that set through handles. This figure shows the SDM handles used to manipulate objects.

Attaching a handle to an object in a selected set and pulling or pushing its parts causes some or all objects in the selected set to change. The handles were designed to look similar for different object types so that users need not remember the functions of many visually distinct handles. When handles are pulled or pushed, the objects contract, expand or move continuously. Using animation in this way helps users perceive the changes that have occurred or are occurring to an object set more easily.

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