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Function perspectiveFromFieldOfView

perspectiveFromFieldOfView(out: mat4, fov: any, near: number, far: number): mat4
Generates a perspective projection matrix with the given field of view. This is primarily useful for generating projection matrices to be used with the still experiemental WebVR API.
Parameters
- out: mat4
  mat4 frustum matrix will be written into
- fov: any
  Object containing the following values: upDegrees, downDegrees, leftDegrees, rightDegrees
- near: number
  Near bound of the frustum
- far: number
  Far bound of the frustum
Returns mat4
out