The original texture coordinate and height values are already represented in tangentspace, so the eye vector must be as well.
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。
2
The eye vector can be created in global coordinates by subtracting a surface position from the eye position and transforming the resulting vector into tangentspace.
视向量能够在全局坐标系中通过视点坐标减去表面坐标来创建,并且要把结果转换到切线空间中。
3
Then, based on the CR formulation, the internal force vector and tangent stiffness matrix of large rotation and small strain space bar and plane beam element are deduced.