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  2. Shape analysis (digital geometry) - Wikipedia

    en.wikipedia.org/wiki/Shape_analysis_(digital...

    Shape descriptors can be classified by their invariance with respect to the transformations allowed in the associated shape definition. Many descriptors are invariant with respect to congruency, meaning that congruent shapes (shapes that could be translated, rotated and mirrored) will have the same descriptor (for example moment or spherical harmonic based descriptors or Procrustes analysis ...

  3. 3D Morphable Model - Wikipedia

    en.wikipedia.org/wiki/3D_Morphable_Model

    In computer vision and computer graphics, the 3D Morphable Model (3DMM) is a generative technique that uses methods of statistical shape analysis to model 3D objects. The model follows an analysis-by-synthesis approach over a dataset of 3D example shapes of a single class of objects (e.g., face, hand).

  4. Anchor modeling - Wikipedia

    en.wikipedia.org/wiki/Anchor_Modeling

    Historized attribute tables have an extra column for storing the starting point of a time interval. In a knotted attribute table, the value column is an identity that references a knot table. An example of a static attribute for their names is a set of 2-tuples: { #42, 'Huey' , #43, 'Dewey' , #44, 'Louie' }

  5. Vertex (computer graphics) - Wikipedia

    en.wikipedia.org/wiki/Vertex_(computer_graphics)

    Such attributes can include: Position 2D or 3D coordinates representing a position in space Color Typically diffuse or specular RGB values, either representing surface colour or precomputed lighting information. Reflectance of the surface at the vertex, e.g. specular exponent, metallicity, fresnel values. Texture coordinates

  6. List of interactive geometry software - Wikipedia

    en.wikipedia.org/wiki/List_of_interactive...

    Interactive geometry software (IGS) or dynamic geometry environments (DGEs) are computer programs which allow one to create and then manipulate geometric constructions, primarily in plane geometry. In most IGS, one starts construction by putting a few points and using them to define new objects such as lines , circles or other points.

  7. CityGML - Wikipedia

    en.wikipedia.org/wiki/CityGML

    Logo. CityGML is an open standardised data model and exchange format to store digital 3D models of cities and landscapes.It defines ways to describe most of the common 3D features and objects found in cities (such as buildings, roads, rivers, bridges, vegetation and city furniture) and the relationships between them.

  8. Geometric primitive - Wikipedia

    en.wikipedia.org/wiki/Geometric_primitive

    A 3D torus prim created in Second Life, an example of a parametric shape A Parametric shape is a standardized two-dimensional or three-dimensional shape defined by a minimal set of parameters, such as an ellipse defined by two points at its foci, or three points at its center, vertex, and co-vertex.

  9. Alpha shape - Wikipedia

    en.wikipedia.org/wiki/Alpha_shape

    Alpha shapes are closely related to alpha complexes, which are subcomplexes of the Delaunay triangulation of the point set. Each edge or triangle of the Delaunay triangulation may be associated with a characteristic radius: the radius of the smallest empty circle containing the edge or triangle.

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