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Hand-painted Animation with Intelligent Brushes Tom Van Laerhoven, Fabian Di Fiore & Frank Van Reeth [email protected] Hasselt University - Expertise Centre for Digital Media transnationale Universiteit Limburg Belgium CASA’08. Goals.

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Hand-painted Animation with Intelligent Brushes

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Hand painted animation with intelligent brushes

Hand-painted Animation with

Intelligent Brushes

Tom Van Laerhoven, Fabian Di Fiore & Frank Van Reeth

[email protected]

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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