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

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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, 2016 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, 2016 at 0:03

1 Answer 1

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To draw straight lines select Draw>Line on the grease pencil section.

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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.

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  • $\begingroup$ in mac os it is opt+D $\endgroup$
    – kia nasirzadeh
    Dec 24, 2020 at 23:41

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