Hi Eric, When re-exporting a model lets say from MicroStation - if the bounding box size changes (e.g. the entire area encompassing the model), then it is likely that the model will move inside of LumenRT. The re-export facility is designed to accommodate small changes to the model. When large geometry changes happen that affect the bounding box, then the model is re-centered. We are looking at several scenarios for changing this behavior in the future. In the meantime, if you create some geometry like boundary markers at the outer edges of the model, then each re-export should align perfectly,
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