Abstract
"INVISIBLE-The Shadow Chaser-" is an entertainment content that aims the representation of virtual objects by presenting various indirect information of the objects. In this content, we use the combination of shadow, sound, weight, and vibration for representation of invisible creatures. Two players cooperate to capture the creatures. One has a magical spotlight to make the shadow of the creatures. The other estimates a position of the creature from the shadow and the sound of footsteps and captures the creature by a vacuum-like device. When the creature is captured, the player feels a weight of the creature on the backpack. We exhibited the content in IVRC 2005, Laval Virtual 2006, and SIGGRAPH 2006 and inspected the effect of a combination of these information upon the presence of virtual creatures. The collected opinions from these exhibition experiments revealed that the multi-modal presentation of indirect information can make players feel the existence of invisible creatures more effectively than the single sense presentation.
