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Open_CASCADE_notes_-_Surface_Modeling.pdf
OPEN CASCADE NOTES
A B L O G A B O U T T H E O P E N S O U R C E 3 D M O D E L I N G K E R N E L :
N O T E S F R O M I T S F O R M E R D E V E L O P E R A N D P R O J E C T M A N A G E R
Surface modeling. Part1
Surface modeling is a fundamental feature of any 3D geometric
modeler. As you know, Open CASCADE offers a set of elementary
surfaces (planar, conical, spherical, etc), Bezier and
B-Spline, revolved, extruded and offset surfaces. There is
also a trimmed surface which trims an underlying surface in
parameter space.
Open CASCADE implements a subset of STEP (ISO standard 10303,
part 42) for geometrical and topological entities, though with
some minor deviations.
The surface object only contains a final geometrical
representation and does not provide any information on how
it was created. This differentiates it, for instance, from
ACIS which uses a notion of so called procedural surfaces which
may contain both a construction technique and an optional
final approximation. For instance, a skin surface comes with
description of a set of section curves the surface was
skinned through and resulting NURBS approximation. This
leads to increase in number of entity types to be supported
by the modeler and likely complexity of modeling algorithms
that use them. (This also makes me suffer developing extra
classes to represent all this variety in the CAD Exchanger
translator and to translate them into Open CASCADE. I can
successfully re-import all SAT files exported from Open
CASCADE but not all possible SAT types yet). By the way, if
there are readers who are familiar with ACIS their comments
would be valuable to check how OCC capabilities compare with
those of ACIS.
Open CASCADE favors different approach where knowledge of the
performed modeling algorithms is stored elsewhere (e.g. in
OCAF using function drivers). The B-Rep model only contains
a result of an operation and thus is more
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