48     float zx, zy, zz, zo;  field in Matrix3D
69         zy *= f;  in scale()
85         zy *= zf;  in scale()
104         float Nxy = (float) (xy * ct + zy * st);  in yrot()
109         float Nzy = (float) (zy * ct - xy * st);  in yrot()
119         zy = Nzy;  in yrot()
130         float Nyy = (float) (yy * ct + zy * st);  in xrot()
135         float Nzy = (float) (zy * ct - yy * st);  in xrot()
145         zy = Nzy;  in xrot()
178         float lxy = xy * rhs.xx + yy * rhs.xy + zy * rhs.xz;  in mult()
183         float lyy = xy * rhs.yx + yy * rhs.yy + zy * rhs.yz;  in mult()
187         float lzx = xx * rhs.zx + yx * rhs.zy + zx * rhs.zz;  in mult()
188         float lzy = xy * rhs.zx + yy * rhs.zy + zy * rhs.zz;  in mult()
189         float lzz = xz * rhs.zx + yz * rhs.zy + zz * rhs.zz;  in mult()
190         float lzo = xo * rhs.zx + yo * rhs.zy + zo * rhs.zz + rhs.zo;  in mult()
203         zy = lzy;  in mult()
220         zy = 0;  in unit()
231         float lzx = zx, lzy = zy, lzz = zz, lzo = zo;  in transform()
246                 + zo + "," + zx + "," + zy + "," + zz + "]");  in toString()