Grabbing techniques

When we use a direct selection then we can interpret the moment of selection also as the statement to grab object. In the case of two following selection techniques we must use some signal to confirm the grasp of object. With grabbed object we have a possibility to manipulate it in three ways:

• remote manipulation - hand and object necessarily do not touch in virtual world
• object transfer method - object (and its neighbourhood part of scene) is moved to cursor position, manipulated, and when released, it moves back (see Figure 4 and Figure 5)
• hand transfer method - virtual hand moves to object's location and manipulation is done there in proper scene context (see Figure 6 and Figure 7)

Figure 4: Situation before object seizing using object transfer method.

Figure 5: Situation after object seizing. Object and scene were transfered close to users hand.

Figure 6: Situation before object seizing using hand transfer method.

Figure 7: Situation after object seizing. Users hand moves close to object and manipulation is done there.

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