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Action:
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Creates arrays of control points, weights, u knots, and v knots from a B-spline surface.
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Prototype:
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void bs3_surface_to_array (
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bs3_surface srf,
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// given surface
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int& dim,
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// returned dimension
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logical& rational_u,
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// returned rational in u
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logical& rational_v,
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// returned rational in v
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int& form_u,
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// returned form in u
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int& form_v,
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// returned form in v
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int& pole_u,
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// returned poles in u
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int& pole_v,
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// returned poles in v
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int& num_u,
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// returned number of
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// control points in u
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int& num_v,
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// returned number of
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// control points in v
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SPAposition*& ctrlpts,
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// returned control
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// points in desired
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// order
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double*& weights,
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// returned weights
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int& degree_u,
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// returned degree in u
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int& num_uknots,
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// returned number of
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// knots in u
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double*& uknots,
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// returned knots in u
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int& degree_v,
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// returned degree in v
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int& num_vknots,
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// returned number of
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// knots in v
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double*& vknots
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// returned knots in v
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);
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Includes:
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#include "kernel/acis.hxx"
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#include "baseutil/logical.h"
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#include "baseutil/vector/position.hxx"
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#include "kernel/spline/bs3_srf/bs3surf.hxx"
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#include "kernel/spline/sg_bs3s/sps3srtn.hxx"
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Description:
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The surface is defined by an array of control points, weights, and knots in the u (v) parameter. The surface may be rational in either u or
v, it may be open, closed, or periodic in u or
v, and it may have parametric singularities at the minimum or maximum parameter values in either u or
v.
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The control points are returned as an array of coordinates in the form (x,y,z) or (x,y,z).
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The function creates arrays of control points, weights, u knots, and v knots. It is up to the application to delete these arrays.
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rational_u and
rational_v specify if surface is rational (1) or not rational (0).
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form_u and
form_v specify if the surface is open (0), closed (1), or periodic (2).
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pole_u and
pole_v specify if the surface has poles at none (0), low
u/v (1), high
u/v, or both.
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If the surface has multiple end knots, the knot arrays returned have same knots at start and end up to respective
degrees + 1.
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Library:
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kernel
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Filename:
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kern/kernel/spline/sg_bs3s/sps3srtn.hxx
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Effect:
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Changes model
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