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Returning to the original 3 beam plan, this is the 30% voxel-based dose surface. These surfaces are generally more complex than point surfaces, and require flat (not smooth) shading, both resulting in reduced graphics interactivity. Further, they can not be simplified without losing the clean voxel edges. More importantly, what does this really represent? A dose voxel is included if its value is 30% or greater. For example, if two adjacent voxels are 29% and 60%, the 60% one would be included. Thus, although this surface has been colored to reflect 30% dose, it actually represents dose values of 30% OR GREATER. This is very different from a point-based dose surface.