In our animated marine world, we model clustered seaweeds (multiple leaves originated from the same root) that are often observed in nature. To perform efficient visibility check of seaweeds, we use a rectangular bounding box for each seaweed cluster (see Fig. ). The visibility of a seaweed cluster is determined by the visibility of the 8 corners of the corresponding bounding box. If any of the corner points is visible, the seaweed cluster is visible.
|Xiaoyuan Tu||January 1996|