If an image is loaded into 3DSOM Pro that doesn't include the calibration target(s) then 3DSOM Pro cannot use it until the camera location has been defined. This process is called "alignment" and can also be used to adjust the camera position for other images that do include the mat.
Image taken of the calibration mat under normal lighting conditions without any projected stripes. Calibration shots are used in place of leaving the calibration mat in every normal and stripe shot. This allows better image framing and more automatic masking.
There are two types of calibration target. A single radial pattern placed under the object or multiple "domino" targets placed around the scene used for large objects. This allows 3DSOM Pro to automatically work out the exact positioning of the camera relative to the object in each photograph.
Clipping is used to remove unwanted geometry from the stand under the base of the model. A horizontal 'clip plane' can be moved up and down to choose the cut-off point and then all geometry below that is removed leaving the model with a flat bottom surface.
The number of triangles in a triangle mesh can be reduced continuously by a technique known as "decimation". At each stage, a single vertex is removed from the mesh and the surface re-triangulated around the missing vertex to produce a closed mesh with one fewer triangles. Which vertex to remove is carefully chosen to minimise the impact on the shape of the surface.
Each image in the project can have an associated mask that defines where the object lies in the image. 3DSOM Pro uses this boundary between the masked and unmasked regions of an image to define the outline of the object in that image. The outlines in all the images in the project are used to define the shape of the object in 3D.
3DSOM Pro can calculate a cloud of points by processing pairs of photographs of the object illuminated with a stripe pattern. Each point represents a 3D position in space. The point cloud can be used when optimising the surface to create more accurate surfaces with concavities.
Image taken of the object with low lighting and a digitally projected pattern of stripes focused on the object surface. Pairs of these images are used to create point cloud data for improved modelling accuracy.
As well as storing the surface as a triangle mesh, 3DSOM Pro can compress this vastly by approximating it with a subdivision surface". A subdivision surface is stored as a "base mesh" which is just a simple triangle mesh but with very few triangles. A final mesh for rendering can then be created from this using subdivision to produce a smooth and detailed surface.