WEBVTT

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Giving a scaffolded 3D product sketch as input,  

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we propose to let the user manipulate the 
scaffolds

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for product design exploration

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Product designers, often draw using 
a technique called analytic drawing  

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they draw scaffold lines

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to help them accurately draw shape curves

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they will also often use freehand 
drawing to add details in the end  

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the set of scaffolds, shape curves and 
detail strokes are heavily interrelated  

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as a result, once a draft is completed,
modifications are extremely difficult  

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we propose to use scaffolds to assist the 
designers in exploring and modifying their product  designs

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our key Insight is that the same scaffolds 
designers create for analytic drawing provide   

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an intuitive set of handles

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the user can interleave  
drawing detail strokes and scaffold manipulation

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shape curves and the detail strokes 
will both move along with the scaffolds

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there are three main technical challenges to 
using scaffolds as handles for deformation  

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the first one is which constraint to remove ？
for this cube, shared-endpoints, same length,  

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perpendicular and parallel constraint between the 
scaffold lines will prevent the user from doing  any edit

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release different constraints will give 
us different results

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our key idea is to remove  the broken constraints and detect newly relevant ones, and then optimized based on these constraints  

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we also support multiple scaffolds select and 
edit, the user can obtain any of these results by  

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selecting different sets of of scaffolds

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another challenge is how to update the shape curves

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if not the updates properly shape curves will 
appear distorted and unnatural  

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our solution is to represent shape curves as weighted average 
of scaffold lines, see the paper for details  

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we use the same idea for detail strokes, however if  

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the weights are not choosing properly, we 
can see unexpected detail strokes update  

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our weights are carefully choosing to 
be sparse and favored nearby scaffolds

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giving a scaffolded 3D product sketch 

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we can do various exploration on it

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thank you