6732     p.perspective = function perspective(fov, aspect, near, far) {  argument
6742         near = cameraNear;
6747       yMax = near * Math.tan(fov / 2);
6751       p.frustum(xMin, xMax, yMin, yMax, near, far);
6754     p.frustum = function frustum(left, right, bottom, top, near, far) {  argument
6757       projection.set((2 * near) / (right - left), 0, (right + left) / (right - left),
6758                      0, 0, (2 * near) / (top - bottom), (top + bottom) / (top - bottom),
6759                      0, 0, 0, -(far + near) / (far - near), -(2 * far * near) / (far - near),
6763     p.ortho = function ortho(left, right, bottom, top, near, far) {  argument
6769         near = -10;
6775       var z = -2 / (far - near);
6779       var tz = -(far + near) / (far - near);