The calculation algorithm of shadow vanishing point is as follows:
Single-view geometry Vanish Point (vanishing point/vanishing point) calculation method - Robert_T_Collins (Robert Collins) algorithm https://blog.csdn.net/beyond951/article/details/122309070?spm=1001.2014.3001.5501
Refactoring reference:
Single View Reconstruction of Teacher Lu Peng's 3D Reconstruction Course https://blog.csdn.net/beyond951/article/details/122265206?spm=1001.2014.3001.5501