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.
The screenshots will give you an idea of what GTS can do. You can read the reference manual for more information.
Help would be very appreciated and you are very welcome to contribute.
A multi-resolution model with respectively 2918, 4849 and 15076 triangles. The original model is on the left and was refined using a midpoint insertion technique.
---ref:
http://gts.sourceforge.net/
Look at this illustration… If you hold a pencil to a sheet of paper as though you were sketching, you will see that the length and breadth of the sheet of paper form 2 axis. The pencil which is at 90 degrees angle from the sheet is the third axis. See?So you have…
If you ever looked at a building blueprint and sketches then you already have a pretty good idea of views. Here are the different views of the letter T. The Orthographic view allows you to see the 3 dimensional view without distortion. The perspective view is the true 3d view. The others are from fixed sides. You need to switch views constantly when modeling in 3d to ensure that the model is consistent. After a while you will instinctively know which side you are looking at the model from.
To view the model you will basically use three types of actions. These are the basic standard actions that are required to view the model in 3d space.
The shaded view allows you to understand lighting and the volume created because of it. The textured view is the view of the model with it’s texturing completed. To understand the difference between shading and texturing… think of a painted terracotta pot. The inherent brown of the Terracotta is it’s Shading and the painted patterns is the texture in 3d parlance.
Obviously this puts a strain on your computer. To avoid sluggishness, softwares always maintain the low-poly (low resolution) version of the model and replace the subdivisions just before it actually renders the finished picture.
