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.

For the above test, the solid texture given below is evaluated as a success by 15 out of 18 subjects, who assign a SUCCESS to the solid texture after checking the texture changes between cross sections of the solid texture in six view directions. Example animations are 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.