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Rev 178 Rev 204
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    void QuatTrackBall::calcRotation(const Vec2f& new_pos)
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    void QuatTrackBall::calcRotation(const Vec2f& new_pos)
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    {
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    {
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	// Check for zero rotation
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	// Check for zero rotation
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	if (new_pos == last_pos)
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	if (new_pos == last_pos)
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	    qinc = Quaternion();
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	    qinc = Quaternion(0.0f, 0.0f, 0.0f, 1.0f);
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	else
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	else
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	{
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	{
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		// Form two vectors based on input points, find rotation axis
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		// Form two vectors based on input points, find rotation axis
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		Vec3f p1 = Vec3f(new_pos[0], new_pos[1], projectToSphere(new_pos));
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		Vec3f p1 = Vec3f(new_pos[0], new_pos[1], projectToSphere(new_pos));
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		Vec3f p2 = Vec3f(last_pos[0], last_pos[1], projectToSphere(last_pos));
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		Vec3f p2 = Vec3f(last_pos[0], last_pos[1], projectToSphere(last_pos));