1. A method for rendering point-based graphics on a computer, the method comprising: storing point attributes of an image space into an image buffer during one or more rasterization passes at a location determined by projecting a three-dimension point position into the image plane coordinates of a camera image plane; performing one or more filling passes on the point attributes of the image space, wherein each filling pass of said one or more filling passes visits each pixel site in the image buffer, computes updated geometry parameters at each pixel site, and stores the updated geometry parameters in a second image buffer; and performing a blending pass after the one or more filling passes on each pixel site in the image buffer, wherein the updated geometry parameters for each pixel from the second image buffer are applied to each pixel; and rendering a new image space based on the image buffer after the filling and blending passes.