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A voxel is a three-dimensional counterpart to a pixel.It represents a value on a regular grid in a three-dimensional space.Voxels are frequently used in the visualization and analysis of medical and scientific data (e.g. geographic information systems (GIS)). [1]
Cinematic rendering, an alternative visualization technique; Isosurface, a surface that represents points of a constant value (e.g. pressure, temperature, velocity, density) within a volume of space; Flow visualization, a technique for the visualization of vector fields; Volume mesh, a polygonal representation of the interior volume of an object
Global illumination [1] (GI), or indirect illumination, is a group of algorithms used in 3D computer graphics that are meant to add more realistic lighting to 3D scenes. Such algorithms take into account not only the light that comes directly from a light source (direct illumination), but also subsequent cases in which light rays from the same source are reflected by other surfaces in the ...
Modern computed axial tomography and magnetic resonance imaging scanners can be used to create solid models of internal body features called voxel-based models, with images generated using volume rendering. Optical 3D scanners can be used to create point clouds or polygon mesh models of external body features. Uses of medical solid modeling;
Vaa3D was created in 2007 to tackle the large-scale brain mapping project at Janelia Farm of the Howard Hughes Medical Institute.The initial goal was to quickly visualize any of the tens of thousands of large 3D laser scanning microscopy image stacks of fruit fly brains, each with a few gigabytes in volume.
A sparse voxel octree (SVO) is a 3D computer graphics rendering technique using a raycasting or sometimes a ray tracing approach into an octree data representation. The technique generally relies on generating and processing the hull of points (sparse voxels ) which are visible, or may be visible, given the resolution and size of the screen. [ 1 ]
Volumetric lighting, also known as "God rays", is a technique used in 3D computer graphics to add lighting effects to a rendered scene. It allows the viewer to see beams of light shining across the environment.
Brain rendered with VOXEL-MAN from magnetic resonance imaging data 1998. VOXEL-MAN is the name of a set of computer programs for creation and visualization of three-dimensional digital models of the human body derived from cross-sectional images of computer tomography, magnetic resonance tomography or photography (e. g. the Visible Human Project). [1]