Layout to model FrustumLine question

Hello everyone,

I’d like to know if there is any chance to get better precision for Frustum Line beam from layout space?

I’m reading coordinates of a point in 3D modelspace when “looking through” layout detail viewport. The coordinates change a little when zooming in/out.

I guess the inaccuracy is due to screen resolution, as FrustumLine is defined by point in screen coordinates based on pixels.

Am I able to get more precise result while the view is zoomed out? Is it possible?

Thank you very much for a hint.

Regards,

Pavel