Posted by jlackie on Mar 08, 2024; 4:30pm
URL: https://forum.librecad.org/Scaling-with-reference-DIM-tp5724417.html

Some background:

-I'm a former AutoCAD user but looking for and opensource alt. that can do simple manipulations such as scaling .dwg or .dxf for use in energy modeling software.

-A lot of times I'm getting PDF's and converting those vector drawings into .dxf I then need to scale these drawings.

-The energy modeling software that I'm using (IES VE) requires an obnoxious level of precision within its 3D modeling application; approx. scaling factors (like from a CAD software rounding a dimension in the thousandth decimal place) can cause headaches later on in the energy modeling process.


What I'm trying to do:      

I need to scale a .dxf of an unknown scale to a known one. ie. CAD allows you to scale to a reference dimension. So, if I have a floor plan I that calls out a 20' dimension I can do the following in AutoCAD:
 -> draw a line that is 20'
 -> use the scale reference command (with the drawing elements selected)
 -> select the unscaled 20' dimension from the drawing
 -> then select the end points of the 20' line I drew

CAD then scales everything so that the 20' from the imported drawings equals the 20' line I drew.

Is this functionality available in LibreCAD? I've gone through a lot of FAQ posts and can't find this capability.