I have found the cause of the bug. The first block in each row has a length of BlockLength+Joint. And the code considers any block that does not have the standard measurements as 'Broken'. I am attaching the file with the fix and I'll do a PR.

Though I think it would be well received that one proposes to create redirections linking command 'user description' to pages. That is actually problematic as workbenches can use the same menu texts for different commands. Also you would have to create these redirects for all languages. And then ke...

tes[0] is a list of vectors.
tes[1] is a list of tuples. Each tuple contains 3 indices pointing to vectors in tes[0].
From each set of 3 vectors a normal can be calculated.

Paper? Steel? Copper? Plastic? Spinnaker nylon?

Thanks for confirming. My guess is that there is a relation with the Coin version.

Startup WB is Draft (but that is probably not relevant). Default WP is None/Auto. Grid is 300x300. Start FC. Call Std_New . Call Std_ViewFront . Switch on Draft_Snap_Dimensions . Call Draft_Line . For the 1st point snap to the grid at 300,0,300 Move the pointer around. Result: the snap dimensions j...

Heda is correct. But the Draft_Edit operation does seem to have an accuracy issue. I am able to connect the end of a line created on the XY plane with the top of a line that is parallel to the Z axis, but cannot then join them with the Draft_Wire command. There is a minute distance between the point...

The OP should install the help files. Std_WhatsThis and F1 will then work. Note 1: For some reason the V0.19 version of the help files does not include the documentation of the Std_* commands. Note 2: F1 does not bring up the page of the current command. It is perhaps a good idea to have Std_WhatsTh...

While testing Draft_Snap_Dimensions I notice some very strange results if WP is Auto and the Front view is activated. I think the issue is related to the projectPoint method: import FreeCAD as App import FreeCADGui as Gui import WorkingPlane Gui.activeDocument().activeView().viewFront() plane = Work...

GeneFC wrote: ↑Mon Jul 05, 2021 5:02 pm I believe this precisely describes the issue under discussion

I have to say I read much, much more in the OP's 1st message. I see an all-out, and rather blistering, criticism of the documentation as a whole.