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.
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.
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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