underlay snapping is not working

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Jesto Thomas

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Nov 13, 2025, 12:21:33 PM11/13/25
to THERM
I am using Therm 7.8.77 and am not able to snap on to underlay.

I have used the the same DXF file in an older version of Therm 7.6 and its working.

tips to correct this issue will be greatly appreciated


Robin Mitchell

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Nov 14, 2025, 7:11:06 PM11/14/25
to Jesto Thomas, THERM
I assume you have the Snap to Underlay setting checked in the Snap Settings tab? 

image.png

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Robin Mitchell
Building Technology and Urban Systems Division
Energy Technologies Area
Lawrence Berkeley National Laboratory

Ben & Jen Butler

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Feb 10, 2026, 1:18:30 PM (5 days ago) Feb 10
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Hi thomasj
Did you find a reason / solution to this issue?
i have the same problem
(I ave "Snap to underlay" selected in settings) 
Thanks


Robin Mitchell

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Feb 10, 2026, 7:20:51 PM (5 days ago) Feb 10
to Ben & Jen Butler, THERM
In THERM 7.8.80 (the current version on our website) the snap to underlay feature is working without issue. 

And I am pretty sure it worked in previous versions also. 

Are you importing the underlay as a DXF using the File/Underlay option? 
image.png

image.png

Robin



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Robin Mitchell
Windows & Envelope Materials Group
Lawrence Berkeley National Laboratory

Ben & Jen Butler

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Feb 13, 2026, 8:01:22 AM (2 days ago) Feb 13
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Thanks to you both for your replys
I tried the things you suggested, no change.  
Then suddenly it started snapping today, I have no idea what changed, but it means I can continue
Thanks
Ben

Robin Mitchell

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Feb 13, 2026, 2:23:44 PM (2 days ago) Feb 13
to Ben & Jen Butler, THERM
Hmm, very strange. Glad it's working, although it's too bad it's not clear what changed.

Robin

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