Point Relative to a Face/Surface

Rhino Rhino for Windows
1

Hi All,

R3D newbie here, and my first post…

i have found out how to place a point on a mesh or surface, for example on a cylinder i can place a point on the top middle. once i scale the cylinder in the vertical direction i want that point also to move relative to the top face of the cylinder.

could anyone please help me how to constraint to a face?

thanks!

2

Hello - a couple of things come to mind -

  1. Group the point with the cylinder so that both will be selected and will scale together - probably the simplest;

  2. Project a point onto the cylinder using History - as long as the original point is around, and the projection direction hits the cylinder from that point, the projected point will update with the cylinder.

-Pascal

3

Thanks Pascal, i will try that soon!

4

lovely jubbly, thanks Pascal that did the trick… :slight_smile:

another question relating to this,… is it possible to create phantom points which wont be part of the overall geometry but only as references for transformations?

5

on further investigation, the point stays relative to the top surface but scaled on other directions the coordinate components other than z too get transformed but i want these coord components to be bound to given edges so that they would maintain the constance distance when transformed, if that makes any sense…

TIA!