TVTerrain Class Reference
[Dynamic Terrain (CLOD)]

Inheritance diagram for TVTerrain:

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List of all members.

Public Member Functions
DTErr	Init (const vtElevationGrid *pGrid, float fZScale)
	initialization

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Detailed Description

The TVTerrain class implements the TopoVista algorithm for regular-grid terrain LOD.

This algorithm requires that the input heightfield is a square regular grid, of any size. Storage requirements are around 14 bytes/vertex. The data is represented in memory by a binary tree of faces.

The VTP implementation consists of an adaptation of the author's own source code, made to work in the vtDynTerrainGeom framework.

The algorithm is promising, but needs a lot of work:

• Doesn't currently address lighting or texturing
• Doesn't utilize triangle strips
• Uses a very simple error metric based only on ground (2D) distance

So far i have extended the algorithm in the following ways:

• Added full 6-plane view-volume culling (instead of the previously simple 2D culling). This required implementing some 3d triangle culling which was mysteriously absent from the computer graphics literature.