###ol3-dem development documentation

ol3-source:

For details take a look at the source code and read code comments. The needed modifications of the ol3 alpha src were made in:

src/ol/renderer/webgl/webgltilelayer.glsl

Is responsible for the rendering of the tiles to the frameBuffer used in the webglmapdefault.glsl.

Vertex shader: Computes plan oblique relief.

Fragment shader: Computes hillshading, hypsometric colors, waterbodies.

src/ol/renderer/webgl/webgltilelayerrenderer.js

Serves the tile renderer with all needed input.

creates triangle mesh for each tile fills a vertex and an element buffer
creates a texture for the hypsometric colors with a colorramp
computes the directions and the scale of the plan oblique shift
computes the direction of the light source
passes all flags from the user interface such as testing mode, water body detection ..
serves the image files for each tile as a texture
creates a buffer with all rendered single tiles
calls src/ol/renderer/webgl/webglmapdefault.glsl that renders the complete map view with the tile buffer

src/ol/renderer/webgl/webglmaprenderer.js

Renders the map with a framebuffer filled with tiles as a texture.

src/ol/renderer/webgl/webgllayerrenderer.js

added a renderbuffer to store the depth values for the tiles because the z-test is done in the webglmapdefault renderer.
just enabling depth as an argument of the getContext in webglmaprenderer.js is not sufficent for depth testing inside of the tilerenderer. (thanks to http://learningwebgl.com/blog/?p=1786)

src/ol/layer/layerbase.js

Administrates the properties of each layer.

ol3dem demo application:

ol3dem/js/ol3demInit.js

Initializes the ol3 map, the dem layer and a view.

ol3dem/js/ol3demUi.js

Initializes the ol3dem user interface.

Put or link tiles into data/tiles.

src/ol/webgl/shader.mustache

changed shader build template to remove ol-default medium precision for fragment shader