Subject:
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1-8sphe.dat tesselations compaire image
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Newsgroups:
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lugnet.cad
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Date:
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Fri, 29 Sep 2000 11:40:36 GMT
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Highlighted:
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(details)
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Viewed:
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Recently Travis Cobbs proposed to replace the existing 1-8sphe.dat primitive
with an alternative that uses a different tesselation of the sphere surface.
(tesselation is the way in wich a curved surface is represented by dividing it
into plane quads and/or triangles)
For the benefit of those who wand to have a say in this choice, I've
constucted an image where whan can compaire the effects of the proposed
tesselation agains the current one. This image can be viewed at:
http://members.ams.chello.nl/mmoolhuy/compaire.jpg
On the left is the proposed "Travis Cobbs"-method, which uses
16 triangles per sector.
On the right is te existing "James Jessiman"-method, which uses
9 quads and 4 triangles per sector.
Tecnical data of the picture:
The objects you see are two identical 4-4cyli.dat primitives (radius 100),
each topped with a dome consisting of four 1-8sphe.dat primitives of the
appropriate tesselation type.
I've rendered the picture with L3Lab,
Shading: on,
and Color Scheme: 3 Ldlite+Mlcad
Because Travis Cobbs proposed primitive hasn't type 5 lines yet, I've also
turned Show Line Type 5 off, to have a fair comparison.
The background has been manualy changed into white.
Greetings, M. Moolhuysen
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Message has 3 Replies:
 | | Re: 1-8sphe.dat tesselations compaire image
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| 4 days ago I've posted that I've made a compaire image showing the two possible alternatives for surface tesselations for the 1-8sphe.dat primitive. I've waited a while before giving my own opinion, but here it is: For me, the proposed alternative (...) (24 years ago, 3-Oct-00, to lugnet.cad)
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