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Hierarkisk modellering og sanntidsvisualisering av skog

Børresen, Kristian
Master thesis
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hovedfagsoppgave.pdf (2.713Mb)
Year
2003
Permanent link
http://urn.nb.no/URN:NBN:no-7121

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  • Institutt for informatikk [2643]
Abstract
This thesis introduces a method for fast rendering of a forest scenery

in real-time. The subject of forest visualization has been an active

research field in real-time rendering and this paper draws on the

ideas and theory of previous work. The model that we employ is a hybrid

of different techniques used in terrain visualization and

the entertainment industry.

We can effectively divide this paper into two seperate parts. In

the first part we concentrate on building a forest model by

positioning trees in a landscape based on a quadtree. We

show how to build an hierarchical structure by placing trees in such a

manner that more trees are visible the further down the quadtree we

traverse. Methods for placing different treetypes in the terrain

and a dynamic memory scheme are also discussed.

The second part concentrates on the representation of trees in our

model. We introduce a discrete Level-of-Detail method for effective

visualization of thousands of trees by reducing the overall

polygon-count. To save memory we also show how the information

for a tree can be organized in an effective structure.

Since we are working within the bounds of real-time rendering, we

finally show how to visualize our model. By using alfablending we can

fade trees in and out of the landscape in such a fashion that we avoid

popping artifacts. Finally we introduce how height values can be

integrated into the our model.
 
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