dwg file format using the “reaConverter” standard software app. The 3D model generated with 3DF Zephyr was exported in. However, since the 3D model itself was not the primary goal for this specific scenario but rather a “raw” piece of data to use as input for the next vectorization step, there was no need for a further photo acquisition with better light conditions to achieve an overall better quality.įig. The final mesh came with geometry and texture artifacts.
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© Edgar Tovarĭespite the extremely shining, almost glossy surface and the light conditions (direct sunlight) during the shooting, 3DF Zephyr managed to orient 238 out of the 240 final pictures and 3D reconstruct the whole boat surface (Fig. The referred bottom photographs were taken due to the so-called “planning hull” with a stepped chine and several bottom cross-section breaks that had to be properly reconstructed (Fig. Of this dataset, a round of 72 close-ups was taken from the bottom to the keel of the boat setting a shorter distance (1.8 to 2.3 meters). Besides, the boat’s waterline drawn in white paint between the dark painted sides and the bottom was a helpful physical reference during the shooting phase.
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The camera model was a DSRL Canon EOS Rebel T7 with a CMOS sensor of 24 MP equipped with a Zoom Lens EF-S 18-55mm.Ģ63 pictures in JPG format were taken from an average distance of 4.5-5 meters and at three different heights between 0.7 and 1 meter, while the picture baseline was about 1.2 meters. Indeed, a hand-held camera and a ladder were enough for the photo acquisition during that preliminary test. The firm engineers first focused on scanning a small yacht to give photogrammetry a try and figure out further applications to larger commercial vessels.
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Modeling the hull’s shape in a CAD environment – thus supporting hydrostatics and stability analysis – was the firm’s final goal, while the 3D reconstruction in 3DF Zephyr was leveraged as a reference for NURBS modeling in Rhinoceros and Orca3D. Naval architecture may turn out to be a real challenge for image-based scanning since several complications – mostly uniform and reflective surfaces – must be considered. The following case study features a photogrammetry approach to hull and boat 3D reconstruction using 3DF Zephyr Lite, Rhinoceros 7, and Orca3D. de C.V., a marine engineering and naval architecture firm based in Cancun, Q. Marine Engineering, CAD Drawing, Reverse EngineeringĪll data shown below have been kindly provided by Marine Engineer Edgar Tovar of A.T. Photogrammetry for hull design and boat modeling