How do I project points on a 3D plane- How to project a point onto a plane in 3D?

problem ：

I have a 3D point (point_x,point_y,point_z) and I want to project it onto a 2D plane in 3D space which (the plane) is defined by a point coordinates (orig_x,orig_y,orig_z) and a unary perpendicular vector (normal_dx,normal_dy,normal_dz). I have one 3D spot （point_x,point_y,point_z）, I want to project it onto 3D Spatial 2D In the plane , among （ Plane ） By point coordinates （orig_x,orig_y,orig_z） And the unary vertical vector （normal_dx） Definition ,normal_dy,normal_dz）.

How should I handle this? What should I do with ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/eIqK