Thanks Michael, I do see that it works perfectly on flat surfaces having objects (on a cube for example). It works in the case of curved surfaces also but sometimes resulting, here and there, in some leaps. When you try to draw on the surface of a sphere solid, for example, the drawing lines-curves go beneath the surface in some areas. But anyway, it is ok. Thanks again for the quick answering! : - )

Another question too: in the video below, in its 8.16 m. point, there shows that there is a ‘lighting presets’ scroll under the ‘lighting options’ of the ‘view’ section of the ‘options’ tab. I am not finding it in the v.3 I have. Is it somewhere else or it is taken out in this version?

https://vimeo.com/55672426