XMathLib是一個通用的3D圖形數學庫。
其中包含兩個部分：
XMathLib和XGeomLib。分別處理數學和幾何運算。
數學部分包含向量、矩陣、四元數的運算。以及其它的運算。
幾何部分包含Box Frustum AABB OBB Ray Line Line-Segment Plan Triangle等的運算。
zemax源碼：
This DLL models a standard ZEMAX surface type, either plane, sphere, or conic
The surface also demonstrates a user-defined apodization filter
The filter is defined as part of the real ray trace, case 5
The filter can be used at the stop to produce x-y Gaussian apodization similar to the Gaussian pupil apodization in ZEMAX but separate in x and y.
The amplitude apodization is of the form EXP[-(Gx(x/R)^2 + Gy(y/R)^2)]
The transmission is of the form EXP[-2(Gx(x/R)^2 + Gy(y/R)^2)]
where
x^2 + y^2 = r^2
R = semi-diameter
The tranmitted intensity is maximum in the center.
T is set to 0 if semi-diameter < 1e-10 to avoid division by zero.
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