Directions for subsequent prototypes

Combine dissimilar processes with similar world models

• e.g., combine XFRONT with VIXEN, another walkthrough program with ``hotspots,'' triggered actions, etc.

• also a mix of hardware... XFRONT users with joysticks and VIXEN users with HMD + hand-held effectors

Combine dissimilar processes with different world models

• building walkthrough combined with flight simulator... fly plane, land, get out and walk into airport

• building walkthrough combined with virtual conferencing... group of non-colocated people can walkthrough a design and discuss it

• requires transformations among world models

Multi-user world editors

• ISSAC allows single-user interactive construction of world models

• MB_ISSAC: several copies of ISSAC, interacting on the bus

• more user interaction to coordinate, not inherent in the single-user version

• will require specs for user interactions