Several additions are still necessary for a complete link between GOCAD and AVS:

- Completion of the
*Edit*function. - Updating to GOCAD++, which will soon be available at SEP.
- Ability to display well log data (e.g. velocity, dip meter, SP, etc).
- Improved gridding capabilities.

The first approach is to use tools already available in GOCAD. Specifically to characterize the velocity function within the domains by tetrahedra. As time goes along these tetrahedra become more numerous and get smaller. This approach would lean heavily on GOCAD's DSI algorithm to give reasonable values within the tetrahedra and for going from one level of model complexity to another. The boundary between domains would be smoothed by recognizing tetrahedra along the boundary and forcing a degree of continuity across the boundary.

The second alternative is to characterize the velocity function within the domains as a series of 3-D splines. This method is commonly used in 2-D problems and is effective in progressively refining the model (by adding additional coefficients). How to create continuity along the border of regions is unclear. One possible alternative is to define new domains along boundary regions that also have to be characterized by a limited number of spline coefficients.

11/12/1997