home *** CD-ROM | disk | FTP | other *** search
- .TH SFOCAL
- 6 "IRIT Version 6.0"
- .SH NAME
- SFOCAL
-
-
-
- SurfaceType SFOCAL( SurfaceType Srf, NumericType Dir )
-
- Evaluates the focal surface field of surface Srf using the normal
- curvature in the isoparametric direction as given by Dir (either
- ROW or COL). Note this function is not using the principal curvatures as
- is generaly the case for focal surfaces.
-
- Example:
-
- gcross = cbspline( 3,
- list( ctlpt( E3, 0.3, 0.0, 0.0 ),
- ctlpt( E3, 0.1, 0.0, 0.1 ),
- ctlpt( E3, 0.1, 0.0, 0.4 ),
- ctlpt( E3, 0.5, 0.0, 0.5 ),
- ctlpt( E3, 0.6, 0.0, 0.8 ) ),
- list( KV_OPEN ) );
- glass = surfprev( gcross );
- color( glass, red );
-
- gfocal = SFOCAL(glass, col);
-
- Evaluates the focal surface using the COL isoparametric direction's
- normal curvature of the glass surface.
-