The models below were derived from NURBs surfaces using the
IRIT solid modeling
environment. The data is all in the IRIT format, details of which could
be found in the user manual.
Few words on these specific data sets. All the data consists of
triangles only. Each triangle looks as follows:
[POLYGON [PLANE -0.2142377 0.93292164 0.2894121 -0.8252709] 3
[[HSqrCurv 0.821374] [KCurv -3.39314]
[uvvals "0.25 0.25"] 2.21630859375 1.2895751953125 0.33521484375]
[[HSqrCurv 0.151514] [KCurv -2.3828]
[uvvals "0.25 0"] 2.1796875 1.38515625 0]
[[HSqrCurv 0.124987] [KCurv -0.701459]
[uvvals "0 0"] 1.7 1.275 0]
- The "[PLANE ... ]" clause defines the plane (and the normal of
the polygon, pointing inside).
- The '3' at the end of the line with the POLYGON keyword states
that three vertices are to be expected (always the case for these
- Each vertex has the forms of '[[attribute_1 ... ] ... [attribute_N ... ] x y z]'
- The 'HSqrCurv' attribute denotes the mean curvature square value
of the surface at that vertex.
- The 'KCurv' attribute denotes the total (Gaussian) curvature
value of the surface at that vertex.
- The 'uvvals' attribute provides denotes UV parametric values of
the original surface at that location.
The title/picture of each surface below also allows you to download
the original NURBs surface, again in IRIT format (see user
© Copyright 2002-2015 by Gershon Elber
All rights reserved.