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		public:
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		public:
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				/** Constructor. Call with the distance to the center. */
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				/** Constructor. Call with the distance to the center. */
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				SimpleTrackBall(const CGLA::Vec3f& _center, float _r):
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				SimpleTrackBall(const CGLA::Vec3f& _center, float _r):
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						center(_center),
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						center(_center),
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						r(_r), theta(M_PI/2.0f), phi(0.0f),
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						r(_r), theta(static_cast<float>(M_PI_2)), phi(0.0f),
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						da(M_PI/100.0f), dr(r/100.0f), firsttime(true),
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						da(static_cast<float>(M_PI/100.0)), dr(r/100.0f), firsttime(true),
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						X(0), Y(1), Z(2)
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						X(0), Y(1), Z(2)
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						{}
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						{}
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				/** Call this to set up OpenGL viewing matrix. It will also
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				/** Callthis to set up OpenGL viewing matrix. It will also
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						clear the view matrix. */
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						clear the view matrix. */
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				void gl_view() const;
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				void gl_view() const;
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				void get_view(CGLA::Vec3f& c, CGLA::Vec3f& e, CGLA::Vec3f& u)
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				void get_view(CGLA::Vec3f& c, CGLA::Vec3f& e, CGLA::Vec3f& u)
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						{
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						{