Photogrammetry scaling and color calibration targets

Photogrammetry target for scaling and color calibration of underwater 3D models. Each bar has four 12-bit coded targets from Agisoft Metashape, and a cut-out shape for a Keldan Color Checker card. There are two cut-outs to add some stainless steel or lead for added weight. Given the size/shape of the print it is recommended to cool gradually/slowly after printing.

The version with _weights in the name has two cut-outs that allow 4x stainless steel square washers (M10 X 40 X 3.0) to be placed behind the color card, which provides sufficient weight for them to stay in place underwater. The color checker card can be glued in and/or secured with cable-ties.

The scaling bars are sized so that they can fit in drysuit/wetsuit pockets, or we usually carry them in a pocket like this:  vertical velcro pocket.