public void setProjection(int width, int height, double zNear, double zFar){        double right = (width / height);        double left = -(width / height);        double top = 1.0;        double bottom = -1.0;        double a_a = (2.0 * zNear) / (right - left);        double a_c = -((right + left) / (right - left));        double b_b = (2.0 * zNear) / (top - bottom);        double b_c = -((top + bottom) / (top - bottom));        double c_c = zFar / (zFar - zNear);        double c_d = -((zNear * zFar) / (zFar - zNear));        double d_c = 1.0;        double[][] temp = {{a_a,  0.0,  a_c,  0.0},                           {0.0,  b_b,  b_c,  0.0},                           {0.0,  0.0,  c_c,  c_d},                           {0.0,  0.0,  d_c,  0.0}};        matrix = multiply(matrix, temp);    }