Created shaders for VolumeScene
Introduced new shaders to support the new osgVolume::MultipassTechnique
Improvments to MultipassTechnique shaders
Introduced usage of new SampleRatioValue property.
Added support for viewport with offset origin and with it split stereo.
Added transfer function support
Added shaders to support changing shaders withint the new MultipassTechnique
Added support for constraining the volume rendering to within a hull.
Cleaned up shaders
Clean up of shaders
Fixed setting of depth.
Simplified shader name main multipass fragment shader
Removed redudent shaders
Fixed error in the computation of tex coords of Maximum Intensity Projection + Transfer Function rendering.
Updated shaders for cube and hull rendering
Improved the handling of transparency in new osgVolune::MultiPassTechnique shaders
Added handling of TransparencyValue greater than 1.0 to allow for over staration of transparency.
Improved the AlphaFunc test comparisons.
Changed the mip shader to tests only samples that have non alpha=0 colours in the transfer function.
Added support for handling volume tiles with regions
Fixed transfer function shader