Use of a object to cut on a mesh

3SlihuettObject.blend (2.0 MB)

So I am trying to figure out a way to select the inverse of this weird shaped object and use it to delete out the parts of this mesh that I do not want so I can have a object that will be able to place a texture on. I am looking for a methode to use the a shape for knife cut maybe. The weird shaped object is really just an example.

just use a line and the Knife cutter
but make the objects in front view to project on

happy bl

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Make two solid and use the booleans intersection modifiers

Or maybe the dynamic paint

so I should have posted this to begin with

For some reason re mesh wont work on this