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						}
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						}
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				/** Move closer. Typically called from the keyboard callback */
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				/** Move closer. Typically called from the keyboard callback */
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				void closer()
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				void closer()
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						{
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						{
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                            r = std::max(0.0f, r - dr);
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                            r = max(0.0f, r - dr);
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						}
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						}
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				/** Roll ball. Call with the x,y coordinates. This function is typically
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				/** Roll ball. Call with the x,y coordinates. This function is typically
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						called from GLUT's mouse motion callback. */
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						called from GLUT's mouse motion callback. */
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				void roll(int x, int y);
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				void roll(int x, int y);