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Imaging systems are used to get a 3D fix on a tumor 's shifting position , but such methods are difficult to use during radiation therapy , are expensive , and may require X-rays , which can damage surrounding tissue over repeated uses . The first step is to construct a 3D Delaunay triangulation of the points , from which we extract an - solid , that is a subset of the tetrahedra in the 3D triangulation that form a solid shape , whose boundary interpolates the data points . The centre at King 's College London will provide a 3D Visualisation in the Arts Network , with the same broad aims as the Loughborough centre , but focusing on the needs of researchers in the arts and humanities . Any true Flash enthusiast will want to make a 3D model move . The images are refreshed daily to form a 3D visual history .