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Hand-painted Animation with Intelligent Brushes

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Hand-painted Animation with Intelligent Brushes Tom Van Laerhoven, Fabian Di Fiore & Frank Van Reeth {firstname.lastname}@uhasselt.be Hasselt University - Expertise Centre for Digital Media transnationale Universiteit Limburg Belgium CASA’08. Goals.

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slide1

Hand-painted Animation with

Intelligent Brushes

Tom Van Laerhoven, Fabian Di Fiore & Frank Van Reeth

{firstname.lastname}@uhasselt.be

Hasselt University - Expertise Centre for Digital Media

transnationale Universiteit Limburg

Belgium

CASA’08

goals
Goals
  • Enrich interactively created stylized images with procedural animation.
  • Make animation techniques available to untrained users.
  • Avoid steep learning process.
approach
Approach
  • Physically-inspired interactive painting tool “AquaVerve”.
  • Animated canvas with separate canvasfor each frame.
  • Special-purpose “intelligent” brushes.
  • Animated pigment.
  • Show animation continuously.
background
Background
  • Commercial packages: Corel Painter, MoXi, ArtRage, Project Dogwaffle
    • ‘Only’ provide digital equivalent of traditional painting.
  • Literature

I/O Brush

[Ryokai et al. CHI04]

Easel

[Rozin 98]

Paint-Cam

[Rozin 98]

AntBrush

[Tzafestas 00]

aquaverve
AquaVerve
  • Interactive paint system
  • Watercolour, gouache, impasto, …
  • Physically & empirically-based paint algorithms, GPU impl.[Van Laerhoven et al. CASA05]
  • Virtual brush design [Van Laerhoven CGI07]
animated canvas
Animated Canvas
  • Set of 8 – 16 canvasses.
  • Animation is shown continuously.
  • Need for specialized brushes.

canvas representation1024x768 simulation grid

intelligent brushes
Intelligent Brushes
  • Semi-autonomous brush: flame brush

User: Interactively paint stroke

  • System:
  • Record:
  • brush reservoir
  • stroke trajectory
  • brush attributes
intelligent brushes1
Intelligent Brushes
  • Semi-autonomous brush: flame brush

frame 0

frame 1

frame N

undo

User: Interactively paint stroke

Automatically-drawn scripted variations

  • System:
  • Record:
  • brush reservoir
  • stroke trajectory
  • brush attributes

intelligent brushes2
Intelligent Brushes
  • Semi-autonomous brush: flame brush

frame 0

frame 1

frame N

undo

User: Interactively paint stroke

Automatically-drawn scripted variations

  • System:
  • Record:
  • brush reservoir
  • stroke trajectory
  • brush attributes

intelligent brushes3
Intelligent Brushes
  • Moving-dab brush
    • Paint dabs on successive frames
intelligent brushes4
Intelligent Brushes
  • Steady brush
    • Paint on all frames at once
    • Erase animated strokes

Painting motionless background

Erasing animation

animated pigment
Animated Pigment
  • Secondary motion
  • E.g., animate the observed thickness of a single pigment type in impasto paint layer
    • Vibrant or waving paint textures
  • Pigment properties:
  • stickiness
  • clumping
  • weight
  • animation

Single-out a pigment type in a mix

results
Results
  • Camp fire
    • Semi-autonomous flame brush
      • Primary flames
      • Smoke trail
    • Moving-dab brush
      • Secondary flames
    • Steady brush
      • Background
    • Yellow pigment withvibrant flame-like motion
results1
Results
  • Flowing water
    • Semi-autonomous water brush
    • Blue pigment that exhibits soft waving motion
conclusions future work
Conclusions & Future Work
  • Brushes & pigment enhanced with behavioral intelligence
  • Enrich & animate interactively created images
  • Within reach of every digital painter
  • Future work
    • Animation of stroke textures
    • Extend intelligent brush set; more complex scripts
thank you
Thank You

Questions?

http://research.edm.uhasselt.be/tvanlaerhoven

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