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PROCESS: SCANNING: SHADOWS
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PROCESS RESOLUTION SHADOWS HOLES MAQUETTES |
In some cases, some parts of a model may be obscured by the 3D scanners optics. Such an area might be underneath the arm of a standing figure, behind an ear, the inside surface of the legs, etc. These are "shadowed" and to minimize them we can do two things. First we'll reorient the model on the scanner for a better view. If that dosen't work, sometimes we'll break the maquette down into smaller parts in order to expose those shadowed areas for scanning. At some point, doing more scans or breaking the maquette down further to capture the last few percent of the surface becomes impractical. The areas that are left unscanned are holes. The example below shows two images of a clay maquette of an eagle and an image of a partial scan. The blue areas of the scan are successfully captured surfaces and the yellow and transparent areas are areas that were shadowed. You can see that the eagle's back and the tops of the wings were almost completely occluded during the scan. 
Images courtesey of Jay Randal Smith |