Bloomenthal, Jules2015-01-272015-01-2719971467-8659https://doi.org/10.1111/1467-8659.114The relationship between surface bulge and several implicit blend techniques, particularly those based on convolution of a skeleton, is discussed. An examination of branching skeletons reveals that for two and three-dimensional skeletons, the surface will be bulge-free if skeletal elements are sufficiently large with respect to the convolution kernel.10.1111/1467-8659.11431-41