问题
I have text file with point cloud data. This document contains six columns: x,y,z coordinates of points and nx,ny, nz - normal vector coordinate i.e.,
-2.27535 2.33442 12.8694 0.492013 -0.866115 -0.0881364
Could anyone tell me how can I remove hidden points (which are located in the back surface or are not visible in the view) using normal vector? I'm using Matlab.I will appreciate every helpful tip.
回答1:
You probably refer to back face culling: you can determine, using dot product between the normal vector and the view direction whether the normal faces the viewer (negative dot-product) or faces away from the viewer (positive dot product).
来源：https://stackoverflow.com/questions/22645876/how-to-remove-hidden-points-from-point-cloud-using-normal-vectors-in-matlab