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loring authored
add alpha blend compositing to visit and use it to implement ordered compositing. there is some logic to enable it automatically and a gui option to explicitly disable it. it is on by default. I also added an option for enabling depth peeling. this is off by default because it's very slow. I changed all GetCell methods to return long long so that overflow is less of an issue. I fixed a bug in the transparency actor that was causing transparent geometry to be sorted twice. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@27514 18c085ea-50e0-402c-830e-de6fd14e8384
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