vision:
1. Vortex Structure: Is a funnel-shaped vortex core visible with streamlines spiraling around a central vertical axis, matching the ground truth?
2. Glyph Presence: Are arrow glyphs distributed throughout the volume showing velocity direction, similar to the ground truth?
3. Color Mapping: Are both the streamline tubes and arrow glyphs colored by velocity magnitude using a blue-to-red diverging colormap, matching the ground truth color distribution?