To test whether or not textures change smoothly between consecutive slices in any view direction, we randomly select v view directions (6 are used in our experiments). A subject is asked to watch the animation to determine if the texture is changing smoothly from frame to frame. We repeat this test for 18 people. If no sudden change has been identified in all the animations of the selected views, we consider the synthesized solid texture as a SUCCESS by the subject. If more than 50% of the subjects assign a SUCCESS to a solid texture, the solid texture is considered as a success for the test. Otherwise, it is a failure.

The solid texture given below is evaluated as a failure of the input by the subjects because there are sudden changes in textures between consecutive slices in one or more of the animations shown below.

In experiemnts, the six view directions are chosen randomly by the system. The view directions shown in the example below are used only for illustration purposes.