Tracing and Sketching Performance using Blunt-tipped Styli on Direct-Touch Tablets
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Transcript of Tracing and Sketching Performance using Blunt-tipped Styli on Direct-Touch Tablets
Tracing and Sketching Performance using Blunt-tipped Styli on
Direct-Touch Tablets
Sriram Karthik Badam, Senthil ChandrasegaranNiklas Elmqvist, Karthik Ramani
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Typical product design
Sketch primitives
Develop a model from primitives
Improve quality by tracing over
Can digital design tools replace paper for this?
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Study14 participants
(13 male, 1 female)
3 medium + input
multiple shapes
2 tasks Tracing Sketching
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Tracing
x 3 repetitions
• Time taken for each trace
• Failures to keep to the tunnel
• Questionnaire
x 3 media
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What’s better?
Tracing speed
Fast to Slow
*
7.27 sec 7.69 sec 8.58 sec
* significant with p-value <= .05
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Sketching
x 3 repetitions
x 3 medium
• Sketch Quality – Crowdsourced voting!
• Questionnaire
A B C D
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AspectsFamiliarity (self reported) occlusion
friction parallax
different* pen-paper different than tablet
pen-paper different than tablet
< <
>
< =
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Findings
Tracing speed
Tracing failures (fewer)
Sketch quality of cubes
Sketch quality of cylinders
* *** *
(*) significantly better performance than the unmarked media
-----------------------------same---------------------------
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Follow-up6 participants
(5 male, 1 female)
2 medium + input
multiple shapes
2 tasks Tracing Sketching
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Data collection
• Time taken for each trace
• Failures to keep to the tunnel
• Sketch Quality – expert voting (4 independent judges)!
Tracing (5 shapes) Sketching (3 shapes)
• Questionnaire • Questionnaire
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What’s better?
Sketch quality
High to Low
• Sketches drawn with hard-tipped stylus were chosen three times more frequently
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Findings
Tracing speed
Tracing failures (fewer)
Sketches*
(*) sketches selected three times more frequently
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IIS-1227639
IIS-1249229
IIS-1253863
Donald W. Feddersen Chaired Professorship
Purdue School of Mechanical Engineering.
Acknowledgment
Questions?
S. Karthik Badam