The Balloon Project

The Balloon project blog is a place to talk about my personal virtual globe project so called "Balloon Project". Initially it was born using my own developed 3D API allowing to load, render and animate GIS information, georeference images, import lat/lon shapefiles and load layers from any WMS server. The future project will be based (I hope it) in WWJ. WWJ is still in an early alpha stage, because it, I try to contribute with some features I learn or implement working in my own 3D API.

Saturday, January 12, 2008

Shapefile support started

Today I have started the support for shapefiles in WWJ.

There to group of things:

Goods. These are the good things about the implementation:

I am adapting the same code I used some time ago in my own 3D API of Balloon Project. That is a good new for me :)
The features are loaded "dynamically", not waits until the whole file is read, instead the reader process adds on the fly a new renderable object for each read feature.
The implementation uses display list and the performance is pretty good.
It allows read points, polygons and collection of geometries (I need to refresh the geometry hierarchy).
You can specify the color, opacity and thickness of geometries. When some property that affects its visualization the display list is recreated.

Bads. These are the bad new about the implementation.

Polygon are not filled.
You must to set the globe to a flat globe (vertical exaggeration equal zero). For the moment there are problems with the globe relieve.

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