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Ptex: Per-face Texture Mapping

for Production Rendering

Brent Burley and Dylan Lacewell

Walt Disney Animation Studios

EGSR 2008

(See attached slide notes for details)

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Texture Mapping at Disney

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Chicken Little 2003

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170 textures

Chicken Little 2003

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Meet the Robinsons 2005

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7637 Textures

Meet the Robinsons 2005

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Meet the Robinsons

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6 million texture files

100,000+ textures per render

Mean file size 30 KB Median file size 2.5 KB

I/O Bound!

Meet the Robinsons

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Bolt 2008

Pre-production estimate: 5x complexity of Meet the Robinsons

Already at limits of texture system

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Requirements for new texture

system Film-quality

General

Efficient Setup-free

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Filtering Requirements

Anisotropic

Filtering

Aliasing-free Seamless

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Previous Texture Mapping Methods

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Projection

Painting

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Seamless texture mapping of subdivision surfaces by model pelting and

texture blending. Piponi and Borshukov, Siggraph 2000.

Pelting

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Least squares conformal maps for automatic texture atlas

generation. Levy et al., Siggraph 2002.

Atlas Methods

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Volumetric Methods

Painting and Rendering textures on unparameterized models.

DeBry et al., Siggraph 2002.

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Polycube-maps, Tarini et al., Siggraph 2004.

Per-face Methods

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Displaced Subdivision Surfaces.

Lee et al., Siggraph 2000.

Per-face Methods (cont.)

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Ptex

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Face 7:

adj. faces: {-1,8,17,-1}

adj. edges: {x,3,0,x},x=dont care

Per-face UVs and adjacency data

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Painting

Artists paint on limit surface in 3d painting

system (tumble, paint, project).

Auto-size feature compensates for

parametric distortion.

See video demonstration.

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212,536 faces

1 ptex file

4x4 texels per face

3.4 million texels

Auto-sized

3.4 million texels

Texture sizing

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Texture sizing - problem case

Subd cage Limit surface

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Sizing by

control-face area

Sizing by

limit-surface area

Sizing by

derivative sampling

Texture sizing - solution

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Filtering

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Filtering in PRMan

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Filtering

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Resolution Mismatch

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Extraordinary Vertex

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1024x1024 pixels Per-patch textures Ptex

CPU seconds 171 141

# I/O calls 18,581,058 9,209

20x20 pixels Per-patch textures Ptex

CPU seconds 27 2

# I/O calls 4,218,733 84

Results

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Glagos Guest 2008

B l

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Bolt

Bolt has nearly completed production. Ptex has been an unqualified success.

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Future

Currently adding non-quad support

(straightforward, described in paper).

Considering Loop subd support.

Interesting question - what shape should

texels be on a triangle mesh (triangular,

quadrilateral, hexagonal)?