原始的材质贴图坐标和高度数据已经在切线空间中了，因此视向量最好也能如此。

The original texture coordinate and height values are already represented in tangent space, so the eye vector must be as well.

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并建立了能反映诸多种非线性影响因素的杆单元切线刚度矩阵。

The member tangent stiffness matrix whichacounts for various nonlinear influence factors mentioned above is established.

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