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The AIM@SHAPE Glossary

Alphabetical list of terms

D

decimation
Reduction of the number of triangles in a triangle mesh, maintaining the original topology of the mesh and preserving a good approximation to the original geometry.
decision trees
A family of classification algorithms. The algorithm classifies data by hierarchical decomposition of conditions, which can be learned from a labeled set of training data.
defocus/focus (shape from)
Estimating the 3D surface of a scene from a set of two or more images of that scene. The images are obtained by changing the camera parameters (typically the focal setting or the image plane axial position), and taken from the same point of view.
degrees of freedom
(1) The variables one can employ in manipulating geometry. Typically, these are the vertices of polygonal meshes and the control points and knots, in case of B-splines.
(2) A particular axis of rotation within a skeleton joint.
description logic
Logic that focuses on descriptions as its principal means for expressing logical expressions. A description logic system emphasizes the use of classification and subsumption reasoning as its primary mode of inference. Description Logics are a family of knowledge representation languages which can be used to represent the terminological knowledge of an application domain in a structured and formally well-understood way. The name description logic refers, on the one hand, to concept descriptions used to describe a domain and, on the other hand to the logic-based semantics which can be given by a translation into first-order predicate logic.
design for x
Philosophy suggesting that a design can be continually reviewed from the start to the end to find ways to guide the design process and improve production and other non-functional aspects. ?Design for manufacture? and ?design for assembly? methodologies remain the most important as they have a direct and recognisable impact on product costs.
detail feature
Aesthetic features of the shape. In accordance with the stylists? activity, they are created in the second modelling phase and applied on a surface for adding aesthetic and functional details and for enforcing the visual effects of important shape elements. Detail features can be classified according to the type of action performed on the surface, i.e. an area deformation or elimination (modelling classification), to the position of the influence area (topological classification), and to the morphological aspects of the resulting shape, i.e. the image of the deformed part (morphological sub-classification).
dicom
Digital Imaging and Communications in Medicine. A comprehensive set of standards for handling, storing and transmitting information in medical imaging. It includes a file format definition and a network communication protocol.
digital terrain model
A discrete model of a topographic surface built on the basis of a finite set of points sampled on the surface itself.
direct kinematics
See Forward kinematics.
direct manipulation
A method that offers direct manipulation of geometry, typically in the context of multiresolution editing of freeform curves and surfaces, and possibly with constraints.
discrete levels-of-detail (lod) model
A collection of independent shape representations, each at a different level of detail.
discretisation
In FE problems, conversion of a geometric model into a suitable discrete model with a finite number of degrees of freedom.
distance surface
It calculates the field value at a point P as a decreasing function of the distance between P and the closest point on the skeleton.
distributed design
Product design performed by actors but located in different places (even in the same company), working on different aspect of a product, but sharing its data.
dl
See Description Logic
doo-sabin scheme
A subdivision scheme for quadrilateral meshes generalizing the bivariate quadratic spline.
dtm
See Digital Terrain Modeling.

 

 

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