simplification 14x mesh simplification 9x edge bundling 4x quadric error metrics 4x model simplification 3x visual abstraction 2x data abstraction 1x data simplification 1x denoising 1x density reduction 1x edge clustering 1x edge congestion 1x edge contraction 1x generalization 1x graph simplification 1x hierarchical approximation 1x high-dimensional approximation 1x multiphase simplification 1x polygonal surface simplification 1x schematisation 1x sparse approximation 1x thinning 1x triangle decimation 1x visual abstraction language 1x