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David Gobbi authored
The vtkImageActor checks for the presence of an alpha component to see if translucent rendering should be used. This can be problematic, because even if there is an alpha component, the alpha component might be 255 for all voxels and the actor might therefore be opaque. A better option is to allow the user to declare their intent by calling ForceOpaque or ForceTranslucent. The base class, vtkImageSlice, only has the ForceTranslucent option because it always predictably renders in the Opaque pass unless forced to render in the Translucent pass.
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