OpenSceneGraph Forum

[adrianj]

Hello,

I am using osgEarth to overlay a survey map onto another map. The survey image is generated as a GeoTiff and draped across the base map. I would like the areas that have no data (white) to be transparent. How do I do this? So far my code is like this but it does nothing at all.

Code:

GDALOptions gdalOptImg; gdalOptImg.url() = url; gdalOptImg.noDataValue() = 0; ImageLayerOptions layerOptions(name, gdalOptImg); osg::Vec4ub *transparentColor = new osg::Vec4ub(); transparentColor->r() = 255.0f; transparentColor->g() = 255.0f; transparentColor->b() = 255.0f; transparentColor->a() = 1.0; layerOptions.transparentColor() = *transparentColor; layerOptions.name() = name; imageryLayer = new ImageLayer(layerOptions);

I have tried a trillion different combinations but none of them seem to do anything.

If you reply please provide a code example, or links to where I can read more information about this, not just an API. Some source code is worth a thousand words

Many thanks for your help!
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