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2 bj 1 
#include "Mat3x3f.h"
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namespace CGLA {
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	Mat3x3f rotation_Mat3x3f(Axis axis, float angle)
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	{
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		Mat3x3f m;
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		switch(axis)
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			{
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			case XAXIS:
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				m[0][0] = 1.0;
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				m[1][1] = cos(angle);
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				m[1][2] = sin(angle);
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				m[2][1] = -sin(angle);
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				m[2][2] = cos(angle);
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				break;
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			case YAXIS:
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				m[0][0] = cos(angle);
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				m[0][2] = -sin(angle);
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				m[2][0] = sin(angle);
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				m[2][2] = cos(angle);
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				m[1][1] = 1.0;
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				break;
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			case ZAXIS:
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				m[0][0] = cos(angle);
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				m[0][1] = sin(angle);
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				m[1][0] = -sin(angle);
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				m[1][1] = cos(angle);
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				m[2][2] = 1.0;
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				break;
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			}
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		return m;
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	}
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	Mat3x3f scaling_Mat3x3f(const Vec3f& v)
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	{
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		Mat3x3f m;
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		m[0][0] = v[0];
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		m[1][1] = v[1];
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		m[2][2] = v[2];
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		return m;
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	}
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}