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Yet another Remark on the Modelling Clip Problem
Author(s) -
Zachrisen Morten
Publication year - 1989
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/j.1467-8659.1989.tb00490.x
Subject(s) - computer science , citation , graphics , computer graphics (images) , world wide web
The PHIGS user spedies a modelling clip halfspace with a point P and a normal vector n in the modelling Coordinate System (MC). The halfspace should be transformed into the World Coordinate Space (WC) using the current modelling transformation M p . Logically, modelling clipping wiU be carried out in WC. Objects to be clipped wil l thus be transformed by their own modelling transformation M, prior to clipping. It should be noted that the object's modelling transformation is not necessarily the same as the clipping halfspace's modelling transformation. Modelling transformations are specified as a general 4x4 matrix and will not necessarily be af6ne transformations (definable by a 3 X 3 matrix and a translation vector).