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 at least in part upon first data and the second data, determining whether the candidate connectivity graph matches the reference connectivity graph; in response to determining that the candidate connectivity graph matches the reference connectivity graph, generating third data that at least maps nodes of the reference connectivity graph to 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.