Procedural Skeletons: Kinematic Extensions to CGA-Shape Grammars - - PowerPoint PPT Presentation

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Procedural Skeletons: Kinematic Extensions to CGA-Shape Grammars - - PowerPoint PPT Presentation

Oct 18, 2023 12 likes •520 views

Procedural Skeletons: Kinematic Extensions to CGA-Shape Grammars Martin Ilk, Stephan Fiedler Werner Purgathofer, Michael Wimmer Institute of Computer Graphics and Algorithms Vienna University of Technology Preview Procedural modeling

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Procedural Skeletons:

Kinematic Extensions to CGA-Shape Grammars Martin Ilčík, Stephan Fiedler Werner Purgathofer, Michael Wimmer

Institute of Computer Graphics and Algorithms Vienna University of Technology

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Preview Procedural modeling Grammars Articulated objects

Martin Ilčík 2

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Procedural modeling ↑ Abstraction ↓ Design costs ↓ Artistic skills ↑ Reusability ↑ Domain knowledge ↓ Local control ↑ Formal theory ↓ Reconstruction

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CityEngine, Pascal Müller

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Nature vs. Urbanism Elements Survival Jagged Long evolution Regular Short term Planarity Batch changes

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Rome Rebuild, Pascal Müller

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Split grammars Sets of shapes instead of symbols Large amount of rules and attributes Attribute propagation Rule selection Image based reconstruction

Symmetries Visual editing

[Wonka et al. 2003]

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image by Peter Wonka

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CGA grammars Scope to oriented bounding boxes

transformation rules splits and repetition absolute and relative scaling component splits

Sequential Occlusion Snapping [Müller et al. 2006] [Lipp et al. 2008]

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image by Markus Lipp

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Procedural modeling of cities

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CityEngine, Pascal Müller

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Poses and Expressions Pose Expression Semantics Relations Functionality

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Poses and Expressions Pose Expression Semantics Relations Functionality

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Poses and Expressions Pose Expression Semantics Relations Functionality

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Poses and Expressions Pose Expression Semantics Relations Functionality

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Poses and Expressions Pose Expression Semantics Relations Functionality

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Excavator Example - Basis

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Excavator Example - Basis

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Excavator Example - Basis

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Excavator Example - Basis

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Excavator Example - Motor

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Excavator Example - Cabin

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Excavator Example - Cabin

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Excavator Example - Chassis

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Excavator Example - Wheels

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Excavator Example - Arm

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Excavator Example - Arm

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Excavator Example - Arm

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Excavator Example - Shovel

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Excavators

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Excavators

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Excavators

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Excavators

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Excavators

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Excavators

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Pose description Kinematic Shapes Rigid bodies Bones

Parent link Children links

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Pose description Kinematic Shapes Rigid bodies Bones

Parent link Children links

Joint

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Pose description Kinematic Shapes Rigid bodies Bones

Parent link Children links

Joint

Default pose

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Pose description Kinematic Shapes Rigid bodies Bones

Parent link Children links

Joint

Default pose Limited transformations

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Pose description Kinematic Shapes Rigid bodies Bones

Parent link Children links

Joint

Default pose Limited transformations Current transformation

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Pose description Kinematic Shapes Rigid bodies Bones – Automatic

Parent link Children links

Joint

Default pose Limited transformations Current transformation

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Pose description Kinematic Shapes Rigid bodies Bones – Automatic

Parent link Children links

Joint – Kinematic Rules

Default pose Limited transformations Current transformation

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Starting configuration

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Sequential split

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Parallel split

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Component split

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Properties Kinematic independence

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Grammar Example

BuildingRoot → Subdiv(“Y”, 3.5){Basement|Floor} Floors → Repeat(“Y”, 3a){Floor}

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Grammar Example

BuildingRoot → Subdiv(“Y”, 3.5){Basement|Floor} Floors → Repeat(“Y”, 3a){Floor} Floor → Comp(“sidefaces”){FloorFacade} FloorFacade → Repeat(“Y”, 1.5a){WindowPane}

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Grammar Example

BuildingRoot → Subdiv(“Y”, 3.5){Basement|Floor} Floors → Repeat(“Y”, 3a){Floor} Floor → KinematicRotation(RotLimits,CurrentRot) Comp(“sidefaces”){FloorFacade} FloorFacade → Repeat(“Y”, 1.5a){WindowPane}

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Grammar Example

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Conclusions Poses enrich semantics

Rule based

Simple extension to CGA

Integration Interactivity

Rigging for free

Post-processing

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Future Work Connectivity preservation Mass and stability Deformations Animation IK

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Acknowledgements Johannes Kühetreiber, Frederico Dusberger Daniel Scherzer, Markus Lipp Reviewers FIT-IT Visual Computing Initiative GameWorld Project THANK YOU FOR YOUR ATTENTION

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