The Simulation of Paint Cracking and Peeling. Realism. Aging in Computer Graphics. Aging. Outline. Peeling
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1 The Simulation of Paint Cracking and Realism E. Paquette 1,2, P. Poulin 1, G. Drettakis Realistic / believable images e-commerce architecture (Physics, Mathematics) Precision (perception, measurement) Constraints (time, memory) Tradeoff (increased realism) effects Aging Aging in Computer Graphics Synthetic objects often look too perfect Deterioration environment everyday use Long term before after Important for realism film virtual reality video games design / prototyping Semi-automatic methods Control before after Thin layer (paint) Cracks, peels
2 Paint Properties Elasticity can be stretched Tensile stress force required to stretch Tensile strength force required to tear Adhesion strength force required to peel Paint Properties Elasticity can be stretched Tensile stress force required to stretch Tensile strength force required to tear Adhesion strength force required to peel Paint Properties Elasticity can be stretched Tensile stress force required to stretch Tensile strength force required to tear Adhesion strength force required to peel Paint Properties Elasticity can be stretched Tensile stress force required to stretch Tensile strength force required to tear Adhesion strength force required to peel Physical Phenomenon Method Paint dries, shrinks, tensile stress Deterioration moisture, uv, pollution elasticity, strength, adhesion cracks, loss of adhesion, peels Simplified model easy control efficiency Surface properties Cracks formation and propagation Loss of adhesion synthetic
3 Previous Work Fracture [Norton1991] [Hirota2001] [O'Brien1999] [Smith2000] Cracks [Hirota1999] [Gobron2001] Previous Work [Wong1997] tendency (peeling sources, 3D noise) threshold (no simulation) [Gobron2001] cellular automata order in which parts detach Previous Work [Wong1997] tendency (peeling sources, 3D noise) threshold (no simulation) Previous Work [Gobron2001] cellular automata order in which parts detach
4 Overview Overview Top view: paint layer 1- stress movement decrease crack of (strain) lateral stress Side view: 5- peeling 2- movement (strain) paint 3- decrease of tensile stress 1- stress 3- increase of shearing stress base 4- loss of adhesion Paint properties 2D grid directional Implementation Texture tensile strength white = low Cracks Control Cracks sequence of linear segments independent of the grid Creation Perpendicular to the maximum ratio Grid property: tensile stress tensile strength Propagation Perpendicular to the maximum ratio Grid property: tensile stress tensile strength New crack
5 Relaxation Adhesion Perpendicular to the crack Grid property displacement induced by the relaxation Loss with respect to ratio Grid property shearing stress adhesion strength Adhesion loss distance Curls perpendicular to the crack Local geometry Control: mesh resolution Direction Crack path is "jaggy" Direction of peeling is more continuous 3φ 2φ 1φ θ cross section mesh rendered Direction Segment Fusion Direction of peeling is even more continuous Level of detail Fusion metrics loss of adhesion length direction Detail information
6 crack IDs Detect with crack ID Detect with crack ID Join intersecting to intersected wrong ID Detect with crack ID Join intersecting to intersected Compute relaxation Detect with crack ID Join intersecting to intersected Compute relaxation Split the intersected crack
7 Simulation System system crack formation & propagation relaxation and adhesion Cracks information path, widths Rendering Maya Plugins paint base cracks geometry color Results: Wall aged 2 nd view Results: Shutters aged 2 nd view
8 Results: Garage Door Results: Video Propagation 2 nd view wall aged text (GI 2002) Results: Statistics nb crack segments simulation (400 MHz) rendering (16 x 400 MHz) wall min 3 min shutters min 3 min garage min 3 min Conclusion Control through textures Cracks and loss of adhesion Local geometry Segment fusion Extensions Multi-layer paint over primer over base surface Multi-processing one crack / processor Interaction with other effects example: rust
9 Questions? Thanks to Alias Wavefront NSERC, FCAR, MRI-MEQ, FES-UdeM, INRIA, UFJ M. Glisse, A. Reche, C. Puech
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