This bronze cast is part of Purdue University’s Art collection. We used a cross polarized setup to cancel highlights. The workflow: Photo acquisition with a Sony a7rIII and a Sigma 35mm f1.4 lens with a circular polarizer and a Godox AR400. 285 images were taken and processed through DXO Photolab. The photogrammetry model was created in Agisoft Metashape with an output of a model with 106,676,895 faces. This model was duplicated and decimated down to 2 million faces for export to Zbrush to create a low poly approximate model for real-time viewing. The low poly model was then imported back to Metashape and automatically unwrapped by Metashape. Then a color, normal, ambient occlusion and a displacement map was projected onto the UV unwrap. Using the color map and Photoshop I isolated areas that were metal and not metal and created a metallic map. I also used the same selections from the metallic map, combined with a grey scale color map to create a roughness map.
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