WalkThrough Illustrations FrameCoherent PenandInk Style in a Game Engine - PowerPoint PPT Presentation

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WalkThrough Illustrations FrameCoherent PenandInk Style in a Game Engine

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Walk-Through Illustrations. Frame-Coherent Pen-and-Ink Style. in a Game Engine. Bert Freudenberg ... Niklas R ber, Thomas Fuchs. Museum of Cultural History, Magdeburg ... – PowerPoint PPT presentation

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Title: WalkThrough Illustrations FrameCoherent PenandInk Style in a Game Engine


1
Walk-Through IllustrationsFrame-Coherent
Pen-and-Ink Stylein a Game Engine
  • Bert FreudenbergMaic Masuch Thomas
    Strothotte
  • Institut für Simulation und Graphik
  • Universität Magdeburg

2
Walk-Through Illustrations
  • Overview
  • Project background
  • Games NPR
  • Our pen-and-ink style
  • Outlining
  • Surfaces
  • Future directions

3
Project background
  • Excavation in 60ies

4
Project background
  • Virtual reconstruction since 1997

5
Project background
  • Visualizing uncertainty ? NPR

6
Project background
  • New challenge Museum exhibition

7
Project background
  • Three projectors in spherical room

5.8 m
8
Project background
  • Real-time visualization?
  • Usual answer Multi-pipe Onyx Performer
  • Big
  • Boring
  • Our answer 3 PCs Game Engine
  • Much cheaper
  • More fun

9
Project background
  • 3D Game Engine provides
  • Efficient 3D content rendering
  • Networking for different views
  • Interaction
  • Just need real-time NPR in that engine!

10
Games NPR
  • Pencil Whipped

11
Games NPR
  • NPRQuake

12
Games NPR
  • Why no commercial real-time NPR games?
  • Must support wide range of hardware
  • Processor speed
  • Graphics board
  • Rather new field
  • Probably soon

13
Pen-and-Ink
  • Elements
  • Outlines
  • Silhouettes
  • Discontinuities
  • Surfaces
  • Hatching
  • Detail

14
Outlines
  • New idea
  • 42 18 16 8
  • Draw? No Yes Maybe

15
Outlines
  • Modeling edges
  • sharp or smooth
  • Preprocess
  • determine convexity
  • Draw edge if
  • sharp, or
  • smooth convex silhouette

16
Outlines
  • Determining convexity
  • convex(e) ? v N lt 0

17
Outlines
  • Drawing edges
  • GL_LINES
  • Display list for sharp edges
  • Silhouettes immediate

18
Surfaces
  • Textures
  • Nothing else is fast enough

19
Surfaces
  • Plain texture on a single quad

20
Surfaces
  • Conventional mipmapping (average filtering)

21
Surfaces
  • Average-filtering an ink texture
  • All gray!

22
Surfaces
  • Solution
  • Hatch Maps
  • Abuse mipmapping

23
Hatch Maps
  • Mipmap levels for hatch maps
  • Mostly b/w!

24
Hatch Maps
  • Mipmapping with hatch maps

25
Hatch Maps
  • Mipmapping with hatch maps, trilinear

26
Surfaces
  • Uniform Hatching
  • Hatch Maps
  • Detail / Structure
  • Ink Maps

27
Ink Maps
  • Idea
  • Use hand-drawn maps
  • Problem
  • How to generate mipmap levels

28
Ink Maps
  • Average filtering

29
Ink Maps
  • Average filtering

30
Ink Maps
  • Minimum filtering

31
Ink Maps
  • Minimum filtering

32
Ink Maps
  • Intelligent filtering?

33
Ink Maps
  • Intelligent filtering?
  • Vectorize
  • Draw each level for constant width
  • Select lines to maintain tone and texture in a
    pleasing way
  • How?

34
Ink Maps
  • Intelligent filtering?
  • Let an artist do it!

35
Ink Maps
  • Hand drawn

36
Walk-Through Illustrations
  • What else?
  • Color Shading

37
Walk-Through Illustrations
  • What else?
  • Hybrid scenes

38
Walk-Through Illustrations
  • Results
  • Extended a game engine for NPR
  • Faster silhouettes
  • Mipmap-based pen-and-ink textures
  • Frame-coherent
  • Constant line width
  • Constant density

39
Walk-Through Illustrations
  • Prototype implementation (2000)
  • Actual exhibition looks different

40
Walk-Through Illustrations
  • Exhibition
  • Museum of Cultural History, MagdeburgOpen now
    until 2nd December 2001

41
Walk-Through Illustrations
  • Future directions
  • Add shading
  • Use colored lines
  • LOD

42
Walk-Through Illustrations
  • Acknowledgements
  • Co-Authors
  • Maic Masuch, Thomas Strothotte
  • Programming, Modelling
  • Niklas Röber, Thomas Fuchs
  • Museum of Cultural History, Magdeburg
  • Sebastian Kreiker, Babette Ludowici
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