VTP Terrain Library (vtlib)

Overview

vtlib is a C++ library for procedurally constructing and rendering interactive 3D terrain from geospatial data.

vtlib features include:

• Continuous LOD for regular grid heightfields
• Several ways to apply imagery (geospecific, derived, or overlays)
• Skydome with sun, moon, and stars
• Vegetation using plant billboards
• Procedurally-generated Roads
• Procedurally-generated Buildings
• Procedurally-generated Linear Structures (Fences, Walls, Hedges, Berms..)
• Several kinds of 3D navigation
• Detail texture (still experimental)
• Importing 3D Models
• Ray-Heightfield intersection testing
• Structure shadowtextures (still experimental)
• Paging of large elevation/imagery (using VTBuilder to create tilesets, libMini to render them)

It is built on top of:

1. the vtdata library which provides the geospatial data types, 2D operations, and most file IO
2. OpenSceneGraph (OSG)
3. Stefan Röttger's libMini CLOD library

Class Documentation

There is automatically generated documentation for the classes.

Usage

• Some description of coordinate systems and frames of reference.
• How to load and draw a simple terrain.
• How to allocate and free vtlib objects.
• How to load and place 3D model files.
• How to create a custom node to draw your own OpenGL geometry.

Issues

• Z-Buffer Issues with roads and water
• Some degree of support for Vehicles