- How do we model mountains?
- Lots of semi-random detail
- Difficult to model by hand
- Idea: Let computer generate random effect in controlled manner

- Start with triangle, refine and adjust vertices
- At each step of refinement, adjust height of vertices
- Use scaled random numbers to adjust height

- Details
- What to use for
*h*?Random number, Gaussian distribution, scaled based on level

I.e., for deeper level, use smaller scale

- May want to do first step manually
Triangular grid, place peaks and valleys

- Could use different
*h*functions to simulate different effects - Automatic colour generation
high == white

medium == brown

low == green

- What to use for
- Results:
- Not physically based, but...
- Look good for little work
- Don't look at from directly overhead

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Readings: Red book, 9.5;
White book, 20.3;
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References; Fornier, Fussell, Carpenter,
Computer Rendering of Stochastic Models, GIP, 1982
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CS488/688: Introduction to Interactive Computer Graphics

University of Waterloo

Computer Graphics Lab