How are point clouds computed?

Hei, I am trying to find out what the internal process in context capture is regarding point cloud generation. Say I am planning to produce only a point cloud from the 500 images I entered into context...
[Descartes] Loft solid

When we could expect Loft Solid tool to be available in Descartes?
[Descartes] Extract reality mesh clip outline

How to extract reality mesh clip outlines as vectors or bsplines? Not digitizing it or project line onto but extract directly. Mesh is not DTM so projection doesn't produce correct results. Clipped...
How to accept the position of proposed user tie points just as the GUI interface dose by python API?

I already give three measurements of one user tie point to the GUI interface and the interface is able to show the responding position in other images. But I have to click the "Accept Position" button...