Tag Archives: props

18. Interactive Props and Physics

The video documentation below illustrates an enactment of iMorphia with props imbued with physics. The addition of rigid body colliders and physical materials to the props and the limbs of the avatar enables Unity to simulate in real time the physical collision of objects and the effects of gravity, weight and friction.

The physics simulation adds a degree of believability to the scene, as the character attempts to interact with the book and chair. The difficulty of control in attempting to make the character interact with the virtual props is evident, resulting in a somewhat comic effect as objects are accidentally knocked over.

Interaction with the physics imbued props produced unpredictable responses to performance participation, resulting in a dialogue between the virtual props and the performer. These participatory responses suggest that  physics imbued props produce a greater sense of engagement through enhancing the suspension of disbelief – the virtual props appear more believable and realistic than those that not imbued with physics.

This enactment once again highlights the problem of colocation between the performer, the projected character and the virtual props. Colocation issues are the result of the difficulty in perceiving where the character is in three dimensional space due to the lack of depth perception. There are also navigational problems resulting from an incongruity between the mapping of the position of the performers body and limbs in real space and those of the virtual characters avatar in virtual space.

17. Interactive Props

In this experimental enactment I created a minimalist stage like set consisting of a chair and a table on which rests a book.



The video below illustrates some of the issues and problems associated with navigating the set and possible interactions between the projected character and the virtual objects.

Problems and issues:

1. Projected body mask and perspective
As the performer moves away from the kinect, the virtual character shrinks in size such that the projected body mask no longer matches the performer. Additional scripting to control the size of the avatar or altering the code in the camera script might compensate for these problems, though there may be issues associated with the differences between movements and perceived perspectives in the real and virtual spaces.

2. Colocation and feedback
The lack of three dimensional feedback in the video glasses results in the performer being unable to determine where the virtual character is in relationship to the virtual objects and thereby unable to successfully engage with the virtual objects in the scene.

3. Real/virtual interactions
There are issues associated with interactions between the virtual character and the virtual objects. In this demonstration objects can pass through each other. In the Unity games engine it is possible to add physical characteristics so that objects can push against each other, but how might this work? Can the table be pushed or should the character be stopped from moving? What are the appropriate physical dynamics between objects and characters? Should there be additional feedback, perhaps in the form of audio to represent tactile feedback when a character comes into contact with an object?

How might the book be picked up or dropped? Could the book be handed to another virtual character?

Rather than trying to create a realistic world where objects  and characters behave and  interact ‘normally’  might it be more appropriate and perhaps easier to go around the problems highlighted above and create surreal scenarios that do not mimic reality?