Confine Osnap vertex to nearest face of a mesh?

Rhino Rhino for Windows
1

Hi,
V5
I am trying to place 2 points and then annotation dots onto a mesh as S1 S2 S3 and R1 R2 R3 for orient3pt, but spotting a suitable place , vertex snap on, I click and then find the point has snapped to somewhere on the far side of the mesh !
its taking forever.
then autosave kicks in and 35 secs wait time.

How can I tell Rhino to use just the mesh surface nearest 'me ’ ?

Cheers

Steve

2

Hi @Steve1
I have no idea if this is available in V5, since I uninstalled it back in 2018 when Rhino 6 came out, but anyhow:
Use CullControlPolygon to set culling to ON.
HTH, Jakob

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