Fig. 1. Illustration of the algorithm. Rays are cast into the dataset; a patch of surface is propagated from each seed cell found.

Fig. 2. An example where the first active cell of a ray intersects does not have an isosurface triangulation that intersects with the ray.

Plate 1. The left column shows four progressively refined images of the skin surface generated at points C=90%, 99%, 99.9% and the end of calculation in graph 1. The right column shows four images of the bone surface generated at points C=90%, 99%, 99.9% and the end of calculation in graph 2.

Table 1. Comparing two intersection choices for ray casting

Table 2. Comparing two propagation distance methods: maximum count and cut-off angle

Table 3. Experiment results of three ray-casting orders

Table 4. The left and right columns show the performance of our program with interpolant and triangle caching turned on and off, respectively

Table 5. The effect of using screen-bounding box

Table 6. The effect of various maximum count values

Table 7. Different points in graph 3, m=9000

Table 8. Different points in graph 4, m=5000