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I am trying to find the focal length and camera position using the BLAM addon for the image below:

enter image description here

I try to draw the required lines in red (entering CTRLDLMB) but blender only draws horizontal lines and vertical lines. What did I forget to do ?

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  • $\begingroup$ Suppose the owner of the addon is not willing or interested to update the addon. What is 'best practice' if you would like to have the addon updated ? I think it is open source. $\endgroup$ – Old Man Nov 9 '16 at 23:15
  • $\begingroup$ I'm not sure if it is the add-on or maybe some of the recent changes on the grease pencil's funcionality $\endgroup$ – user1853 Nov 10 '16 at 0:03
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To draw straight lines select Draw>Line on the grease pencil section.

enter image description here

Otherwise press CtrlD and place the cursor on the starting point of the straight line, then release the Ctrl key while still holding the D key, and position the end point of the line and release the D key.

enter image description here

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