SphereSheetProjector Class Reference

The SphereSheetProjector is projector that is a sphere with a hyperbolic sheet draped over it. More...

Inheritance diagram for SphereSheetProjector:

List of all members.

Public Member Functions
EMMA_EXPORT	SphereSheetProjector (bool orientToEye=true)
	Default constructor.
EMMA_EXPORT	SphereSheetProjector (const Sphere &sph, bool orientToEye=true)
	Constructor taking the sphere.
EMMA_EXPORT	~SphereSheetProjector ()
	Destructor.
virtual EMMA_EXPORT Fusion::Vec3f	project (const Fusion::Vec2f &point)
	Apply the projector using the given point, returning the point in three dimensions that it projects to.
virtual EMMA_EXPORT Fusion::Rotation	getRotation (const Fusion::Vec3f &point1, const Fusion::Vec3f &point2)
	Computes a rotation based on two points on this projector.

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Detailed Description

The SphereSheetProjector is projector that is a sphere with a hyperbolic sheet draped over it.

As the mouse moves away from the sphere, rotation gradually turns into pure roll.

This projector is good for trackballs that want to do a continuous roll. It allows pure roll as you move away from the sphere.

Warning: This projector tends to become unstable when the mouse position is beyond about 2*radius from the center of the sphere. Therefore, it is best to use this as a large, window-sized trackball.

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Constructor & Destructor Documentation

EMMA_EXPORT SphereSheetProjector (  bool  orientToEye = true  )

Default constructor. The default view volume is undefined. The default working space is identity (world space). The default sphere to use has a radius of 1.0 and is centered at (0,0,0). The default eye orientation is TRUE.

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Member Function Documentation

virtual EMMA_EXPORT Fusion::Vec3f project (  const Fusion::Vec2f &  point  )  [virtual]

Apply the projector using the given point, returning the point in three dimensions that it projects to. The point should be normalized from 0-1, with (0,0) at the lower-left. Implements SphereProjector.

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