1. A method for visualizing a custom product in situ, the method comprising: storing first data that represents a reference connectivity graph of a marker; obtaining a digital image of at least the marker; analyzing the digital image to generate second data that represents a candidate connectivity graph; based on the first data and the second data, determining whether for each first node, in the candidate connectivity graph, a first count of first polytopes that are adjacent to a first node in the candidate connectivity graph matches a second count of second polytopes that are adjacent to a second node, corresponding to the first node, in the reference connectivity graph, and if so: generating third data that comprises at least a transform that maps coordinates of nodes of the reference connectivity graph to coordinates of nodes of the candidate connectivity graph; using at least the third data to build a digital asset that visualizes the custom product in the digital image; wherein the method is performed by one or more computing devices.