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Gradient meshes are a 2D vector graphics primitive where colour is interpolated between mesh vertices. The current implementations of gradient meshes are restricted to rectangular mesh topology. Our new interpolation method relaxes this restriction by supporting arbitrary manifold topology of the input gradient mesh. Our method is based on the Catmull-Clark subdivision scheme, which is well known to support arbitrary mesh topology in 3D. We adapt this scheme to support gradient mesh colourdoi:10.1111/cgf.12862 fatcat:fuq2gev5xfbsbjep6zp6kmvp64