Invert knife tool cut or other tool to use I am trying to cut out a rough outline of the background image to hopefully make a 3D Model of it as seen in the screenshot below.


Originally I used the knife tool but that tool only cuts OUT the cuts (the outside) and not cuts out the inside. So in a way I want to use the knife tool to trim my cube more and more until I have a model of my background image.

Any help or ideas? Is there a way to cheat and make a rough model from the background image?
How would I achieve my goal with the knife tool?
Is there another tool I should use instead?
I would extrude a single vertex around, building the model up instead of cutting it out.

&#9096; Ctrl LMB can be used to extrude and position geometry in one step, or E can be used for a two step extrude and move.





That said you might get a similar result much more easily if you auto-trace the image into a vector SVG with a program such as inkscape, then import the SVG into blender.