lib/toxi/geom/Matrix4x4.js
function(theta) {
        _TEMP.identity();
        _TEMP.matrix[1][1] = _TEMP.matrix[2][2] = Math.cos(theta);
        _TEMP.matrix[2][1] = Math.sin(theta);
        _TEMP.matrix[1][2] = -_TEMP.matrix[2][1];
        return this.multiplySelf(_TEMP);
    }
function(theta) {
        _TEMP.identity();
        _TEMP.matrix[1][1] = _TEMP.matrix[2][2] = Math.cos(theta);
        _TEMP.matrix[2][1] = Math.sin(theta);
        _TEMP.matrix[1][2] = -_TEMP.matrix[2][1];
        return this.multiplySelf(_TEMP);
    }
function ( theta ) { _TEMP . identity ( ) ; _TEMP . matrix [ 1 ] [ 1 ] = _TEMP . matrix [ 2 ] [ 2 ] = Math . cos ( theta ) ; _TEMP . matrix [ 2 ] [ 1 ] = Math . sin ( theta ) ; _TEMP . matrix [ 1 ] [ 2 ] = - _TEMP . matrix [ 2 ] [ 1 ] ; return this . multiplySelf ( _TEMP ) ; }
Applies rotation about X to this matrix.

@param theta
rotation angle in radians
@return itself
Applies rotation about X to this matrix .