Modeling by Drawing with Shadow Guidance Lubin Fan 1 , Ruimin Wang 2 - - PowerPoint PPT Presentation

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Modeling by Drawing with Shadow Guidance Lubin Fan 1 , Ruimin Wang 2 - - PowerPoint PPT Presentation

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Modeling by Drawing with Shadow Guidance Lubin Fan 1 , Ruimin Wang 2 , Linlin Xu 2 , Jiansong Deng 2 , Ligang Liu 2 1 Zhejiang University 2 University of Science and Technology of China 1 3D Modeling Fundamental problem Many

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Modeling by Drawing with Shadow Guidance

Lubin Fan1, Ruimin Wang2, Linlin Xu2, Jiansong Deng2, Ligang Liu2

1 Zhejiang University 2 University of Science and Technology of China

1

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3D Modeling

  • Fundamental problem
  • Many professional modeling systems
  • Requiring skills and costing time
  • Too difficult for non-professional users!

2

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  • Easy-to-use systems

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3D Modeling

Drawing sketch is a very natural way to express oneself.

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Sketch-based Modeling Systems

[Igarashi et al. 1999] [Karpenko et al. 2006] [Rivers et al. 2010]

Not easy to draw!

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Example-based Modeling System

[Funkhouser et al. 2004] [Chaudhuri et al. 2011] [Jain et al. 2012]

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Hybrid Systems

Sketch2Scene [Xu et al. 2013] Sketch-to-Design [Xie et al. 2013]

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Guidance

Helpful!

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Shadow Guidance

ShadowDraw [Lee et al. 2011]

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Shadow Guidance

ShadowDraw [Lee et al. 2011]

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  • Creating an easy-to-use system.
  • Providing guidance.
  • Allowing creative variations

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Goal: Guided Sketch-based System

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Our System

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System Pipeline

Online operations

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System Pipeline

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Chairs Airplanes

…

  • Database

– Part repository – Image repository

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Database Constructions

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Part Repository

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  • High-level Information

– Hierarchy information – Contact points – Symmetry information

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Part Repository

Hierarchy Contact points Symmetry

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  • Sample 114 views on the unit view sphere
  • Assign camera up-direction for each view position
  • Extract line drawing image at each view

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Image Repository

𝑣∗ 𝑣

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  • Search engine is based on encoding the patches
  • f all the images in the repository.
  • Descriptor: BiCE [Zimmermann et al. 2007]
  • Min-hash [Chum 2008]

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Search Engine

101011…011010110 BiCE ac...ddt

Min-Hash code

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System Pipeline

Online Operation

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Online Operation

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3d voting histogram

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View-dependent Retrieval

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retrieved parts Up-direction Alignment

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  • Shadow image
  • Hierarchy-based shadow image

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Shadow Composition

S* =a WiIi

å

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Shadow Composition

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  • Contact point guided conjoining
  • Symmetry information

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Part Conjoining

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  • Global fitting

– The silhouette of the top candidate is fitted to the drawing strokes.

  • Local editing

– Sketch based local deforming.

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Creative Modeling

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RESULTS

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Results

Speed: 𝟑𝟏𝟏%

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Results

× 𝟒

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Results

Bicycle models created by users using our system.

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  • Modeling with/without shadow guidance.

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User Study

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  • Limited variations of the model.
  • Part placement.
  • Inconsistent segmentation.

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Limitation

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  • A sketch-based modeling system

– provides shadow suggestions to guide the user’s drawing dynamically – preserves the high-level geometry structure – provides geometric variations

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Summary

3D models created by users using our system

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Thank you for your attention!

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Project page:

http://staff.ustc.edu.cn/~lgliu/Projects/2013_3DShadowModeling/default.htm 3D models created by users using our system