When rendering to a rendertarget, this tells if and what of the rendertarget gets cleared before rendering. For example, if you are assembling a sheet of images, you may want to clear everything on the first image draw, but not clear on subsequent draws.
|All||Clear both color and depth data.|
|Color||Clear the rendertarget’s color data.|
|Depth||Clear the rendertarget’s depth data, if present.|
|None||Don’t clear anything, leave it as it is.|
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