e/Image and object order rendering

Information
has gloss	eng: In computer graphics, image order algorithms iterate over the pixels in the image to be produced, rather than the elements in the scene to be rendered. For typical rendering applications, the scene contains many fewer elements (for example, geometric primitive) than the image (pixels). In those cases, object order algorithms (below) are usually most efficient. But when the scene complexity exceeds that of the image, such as is the case often in volume rendering, then image order algorithms (for example, shear warp) will usually be more efficient.
lexicalization	eng: Image and object order rendering
instance of	e/3D computer graphics