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OK! Thank you very much for your detailed reply.
Yes, it is. The problem appears to be related with the view direction from inside to outside of the torus. There is no issue when the view direction in the opposite side.
It's a resourceful way to solve the problem. It can be employed to identify the result of integrating the residual part of I(ω) directly. Yes, they gave the same answer. Thanks!
I'd like to viewing a closed 3D surface at a fixed point vp amied to another point vc. I tried to employ the ViewVector to do it. But I was confused by the result when vp was nearby the outer boundary of the surface. It showed that the inside of the...
It's not important. You two gave me some good ideas to deal with the problem. The key problem is how to find the root of any one component of BSplineFunction such as f[t] with FindRoot. f[t] is a two components function in some sense. Thank you...