1. IBM's graPHIGS package, problem with GPNBS, any hint?
Hi Everybody!
I have a problem with IBM RS/6000 graPHIGS library and the GPNBS call.
Simply said: The above call inserts the corresponding element into the
structure store, but I don't see nothing on the screen!
I checked whether the currently open workstation supports non-uniform B-spline
surfaces (it does), what the maximum order is (6, I only use 2x3 and sometimes
3x3), so that I'm sure, this primitive is available.
Before inserting the GPNBS I inserted "pfill_area_set3" using the ISO C
Binding provided under /usr/lpp/graPHIGS/samples/cbinding, so that I can use
mixed calls for those routines that are currently not supported in ISO C
Binding form. This fill_area_set3 is properly drawn, so that I'm sure the
workstation is opened correctly. The data I supply for the B-spline surface is
OK, as I am also using libphigs.a (producing PEX calls) on the IBM and on Sun
workstations with X11R5 by MIT. With these libraries I see my surface!
I never use trimcurves, so I don't use GPTNBS.
Here is the call:
#if defined( AIXV3 ) && defined( USE_GRAPHIGS )
GPNBS( (Pint)2, (Pint)3, uknots.num_floats - 2, vknots.num_floats - 3,
uknots.floats, vknots.floats, 0, 0, 0, 1, 4, grid.points.point4d,
uknots.floats[0], uknots.floats[uknots.num_floats - 1],
vknots.floats[0], vknots.floats[vknots.num_floats - 1] );
#else
pnuni_bsp_surf( (Pint)2, (Pint)3, &uknots, &vknots, PRATIONAL, &grid,
(Pint) 0, (Ptrimcurve_list *) 0 );
#endif
Any hint is highly appreciated!
Sincerly,
Matthias
--
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