(CbSbCylinderSectionProjector<1> projects a window space point (usually based on the mouse location) onto the section of a cylinder that has been sliced by a plane. Two projected points can produce a rotation along the cylinder's axis.
The tolerance slice can be specified as a fraction of the radius of the cylinder. The projection point will not extend beyond the sliced portion of the cylinder.
Incremental changes (delta rotation) can
be computed during interactive sessions. Cylinder projectors are typically used to write interactive 3D manipulators and viewers.
METHODS
(Pt
c}
(Pt c}
(CbSbCylinderSectionProjector(Cr(float edgeTol = .9, SbBool orientToEye = TRUE)
(Pt
c}
(Pt c}
(CbSbCylinderSectionProjector(Cr(const SbCylinder &cyl, float edgeTol = .9, SbBool orientToEye = TRUE)
<1>Constructors. The first uses a default cylinder aligned with the Y axis with radius 1.0; the cylinder is supplied in the second. The position of the plane which slices the cylinder into a section is specified
as a fraction of the cylinder radius with the parameter (CbedgeTol<1>. A tolerance value of 1.0 positions the plane down the center of the cylinder. A tolerance value of 0.5 defines the longitudinal plane halfway between
the center and the outside edge of the cylinder. The default value is .9, so that almost half the cylinder is in front of the plane. The (CborientToEye<1> parameter determines whether the plane is perpendicular to the
eye, or perpendicular to the cylinder's Z axis. Setting that parameter to TRUE (the default) specifies that the plane be perpendicular to the eye, which is most often the desired behavior.
The default
view volume is undefined, and the working space is identity.
(Pt
c}
(Pt c}
(CbsetTolerance(Cr(float edgeTol)
(Pt
c}
(Pt c}
(CbgetTolerance(Cr() const
<1>Set and get the edge tolerance as a fraction of the radius of the cylinder. If this is 1.0, the projector is a half cylinder. If this is .1, the projector is a slice of the cylinder with radius .1*radius.
Default is .9.
(Pt
c}
(Pt c}
(CbisWithinTolerance(Cr(const SbVec3f &point)
<1>Find whether this point on the cylinder or tolerance plane is within tolerance.
