simplemarching 2d function looks like wokring now
simplemarching 2d function looks like wokring now

lsqshr/Rivulet-Neuron-Tracing-Toolbox,lsqshr/Rivulet-Neuron-Tracing-Toolbox,lsqshr/Rivulet-Neuron-Tracing-Toolbox,lsqshr/Rivulet-Neuron-Tracing-Toolbox