Choose solid 3-D volume rendering instead of floating 3-D surface rendering
For 3-D rendering of 2-D quantitative data, prefer volume-style 3-D rendering on line or bar charts to improve aesthetics and mitigate low-preference floating-surface forms for viewers judging chart appropriateness.
- purpose:refine
- basis:empirical
- lever:encoding
- communication:resonance
- quality:aesthetics
- aesthetic:style:use
advice
Use solid 3-D forms when you add depth
Choose a solid 3-D volume rendering instead of a floating 3-D surface rendering when you decide to add depth. For example, use a filled-under-the-curve 3-D volume line or a full 3-D bar rather than a suspended surface line or top-only surface bar.
reason
Why solid volumes win within 3-D styles
Not all 3-D treatments are read the same way. Solid volumes look more like real objects than floating surfaces do.
Mechanism: A volume rendering gives the chart a more object-like form, which better matches the paper’s preferred kind of 3-D display.
Evidence: When the paper compared 3-D types, participants preferred renderings that strongly suggested a solid volume over renderings that looked like surfaces floating in space (Levy et al., 1996).
context
Use when you have already decided to add depth
- User Goal: Apply a 3-D treatment to a chart of 2-D data.
- Task: Choose among available 3-D renderings.
- Data: 2-D quantitative data shown as a line or bar chart.
- Chart Setting: A static graph where both 3-D volume and 3-D surface styles are available.
- Audience: Viewers judging the chart’s appropriateness or memorability.
- Success Criterion: The 3-D chart feels more acceptable than a floating-surface alternative.
exceptions
Do not use when depth itself is unnecessary
Break it when: The chart does not need a 3-D treatment at all. Why: This rule only applies after you have already decided to use depth.
costs
Costs of using solid 3-D volume forms
Sacrifice: Some flat simplicity. Risk: Any 3-D rendering still adds extra structure to a chart of 2-D data. Mitigation: If depth is not serving a communication or memory goal, return to a 2-D rendering instead of choosing among 3-D styles.
mistakes
Common misuse of 3-D styling
Mistake: Using a floating surface just to signal that the chart is 3-D. Why it fails: That 3-D style was less preferred than a solid volume rendering.
check
Check the 3-D style choice
Failure Sign: The chart uses a surface that appears suspended in space even though a solid volume version is available. Quick Check: Compare volume and surface renderings of the same data and ask which one better fits the communication goal. Stronger Test: If the chart must stay 3-D, keep the version that viewers judge more appropriate; if the chart mainly supports immediate reading or private inspection, step out of the 3-D choice and use a flat version instead.
fix
Fix the 3-D treatment
- Fill the 3-D form so it reads as a solid volume rather than a floating surface.
- Replace top-only or suspended surfaces with full 3-D bars or volume-under-the-line forms.
- If the current surface effect is only decorative, remove the 3-D treatment instead of keeping the weaker 3-D style.