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I'm trying to cut some planes using knife tool in edit mode. I'm able to do it to some objects but with other objects I can't click on anything with the knife tool. The red square doesn't appear when I got over the edges of the faces in edit mode. This problem comes and goes away. I assume I'm unknowingly changing some setting. Any help would be appreciated thanks

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  • $\begingroup$ Probably you try to cut through occluding geometry (one in front of that geometry you want to cut) or there's a clipping problem which sometimes can prevent Knife tool from working properly. Try to rotate the view a bit, for more info about resetting central point of rotation see blender.stackexchange.com/questions/644/… $\endgroup$ – Mr Zak Nov 6 '18 at 21:05

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