void set_scale(Matrix44f &m, float sx, float sy, float sz)
{
m.makeIdentity();
m[0][0] = sx;
m[1][1] = sy;
m[2][2] = sz;
}
void set_translate(Matrix44f &m, float dx, float dy, float dz)
{
m.makeIdentity();
m[0][3] = dx;
m[1][3] = dy;
m[2][3] = dz;
}
void set_rotate_y(Matrix44f &m, float radian)
{
float sina = std::sin(radian);
m.makeIdentity();
m[0][0] = m[2][2] = std::cos(radian);
m[0][2] = sina;
m[2][0] = -sina;
}