PR-3-dkm - CIS736ComputerGraphics,Paperreview,Spring2000

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CIS736 Computer Graphics, Paper review, Spring 2000 Review by: Dan McAnarney  Paper: "Hierarchical Visibility Culling for Spline Models," by Subodh  Kumar and Dinesh Manocha This paper describes an extension of the back-face culling technique  used for polygons to back-patch culling for splined surfaces.  It also  introduces a data structure named an O N E tree to complement the back- patch culling with the more familiar technique of view-frustum culling. The basic idea behind back-patch culling is to create an array of  normals for the spline surface – a Gauss map.  This map of normals is  then compared the eye point view direction to get a determination of  whether or not the patch is back facing.   This is a good idea,  especially since this normal field is not calculated inside of the  viewing pipeline, but has been pre-calculated for the model.  This (by  the authors’ tests) significantly reduces the number individual  polygons in the pipeline, and speeds display.   By using this 
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This note was uploaded on 05/10/2010 for the course CIS 112 taught by Professor Albert during the Spring '10 term at Aberystwyth University.

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PR-3-dkm - CIS736ComputerGraphics,Paperreview,Spring2000

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