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You need the Gnu Triangulated Surfaces library (GTS) installed on your
system to build portions of TerraGear. GTS provides the needed tools
and infrastructure to impliment our terrain simplification approach.
We modeled our approach after the approach outlined in Michael
Garland's paper here:
http://graphics.cs.uiuc.edu/~garland/software/terra.html
You can get the latest version of GTS from:
http://gts.sourceforge.net/
More information:
GTS stands for the GNU Triangulated Surface Library. It is an Open
Source Free Software Library intended to provide a set of useful
functions to deal with 3D surfaces meshed with interconnected
triangles. The source code is available free of charge under the
Free Software LGPL license.
The code is written entirely in C with an object-oriented approach
based mostly on the design of GTK+. Careful attention is paid to
performance related issues as the initial goal of GTS is to provide
a simple and efficient library to scientists dealing with 3D
computational surface meshes.
A brief summary of its main features:
* Simple object-oriented structure giving easy access to
topological properties.
* 2D dynamic Delaunay and constrained Delaunay triangulations.
* Robust geometric predicates (orientation, in circle) using fast
adaptive floating point arithmetic (adapted from the fine work
of Jonathan R. Shewchuk).
* Robust set operations on surfaces (union, intersection, difference).
* Surface refinement and coarsening (multiresolution models).
* Dynamic view-independent continuous level-of-detail.
* Preliminary support for view-dependent level-of-detail.
* Bounding-boxes trees and Kd-trees for efficient point location
and collision/intersection detection.
* Graph operations: traversal, graph partitioning.
* Metric operations (area, volume, curvature ...).
* Triangle strips generation for fast rendering.