![]() The conceptual difference between global and local refinement is depicted in Fig. Global refinement (propagating through the entire row/column) often adds control points to the mesh where they are not needed, thereby cluttering the workspace and potentially slowing down the workflow. As is well-known in Computer Graphics, the latter aspect is a desirable feature . The main shortcoming is its fixed rectangular topology, making it difficult to design complex objects and impossible to perform local refinement. Upon using the traditional gradient mesh, it becomes clear that it comes with several limitations. In this paper we use the term traditional gradient mesh to refer to the primitive as implemented in these suites. Although there are subtle differences in the way gradient meshes behave in these software packages (see also Fig. More recently, the primitive was added to the proposal for SVG 2 and is now available in Inkscape as well. CorelDRAW soon followed with a similar tool called Mesh Fill. Gradient meshes were introduced by Adobe Illustrator as the Mesh object. This primitive facilitates the creation of intricate colour propagation over regular quadrilateral meshes, contributing to the possibility of designing photorealistic illustrations in vector format. ![]() ![]() The number of different primitives is rather limited, with the gradient mesh as one of the most complex ones. Vector graphics provide an interesting alternative to raster graphics, as they are resolution-independent and in general easier to edit because they are composed of objects (often called primitives) as opposed to coloured pixels.
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