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I want to cut doors holes in walls.
What is method to do it?
I prefer to just cut hole and join vertexes to keep shape simple. Consider that wall has some width and is asymmetric on both sides.
Should I extrude edge loop and do some cut or is there other simpler method?
How can I create edges and vertices on faces intersection?
You can use the Boolean modifier. First create a cube, then scale it so that it intersects with where you want the door to be.
The hole will be cut where the red line is. Next, click your building and add a boolean modifier. Set it to difference instead of intersect, then set the object to the cube you just created.
Now click apply, and delete the cube used to cut the door. You should end up with something like this:
If you enter into edit mode, the extra faces created should automatically be selected. If you want, you can delete the extra faces and get something like this:
To do what you would want, you could select the vertices around the first doorway, press F to make it a face, then press P and select by selection.
This has created a plane that has the exact dimensions of your door. It is a separate object. Press Tab to go into object mode, click the door plane, and press Tab again, to enter edit mode. Then select everything if it is not already selected, then press E for extrude.
You can then click once it is thick enough, then go back to Object Mode. Move the cube so that it is intersecting with where the door should be projected onto. Then do the same thing I mentioned above with Boolean, only use the cube you created with the door instead of a new cube.
Tada, two identical doorways!
You could select the faces you want to use for the door. And use inset I to create the geometry. You can optionally extrude the door frame, and lower the door sill.
One of the problems I have found with a boolean modifier is it makes an absolute hash of the mesh. Using this method means sorting out any stray verts that get created by the cut which create N-gons which in turn makes it very difficult to add loop cuts for any more detailed modelling later down the line (stuff like outer pillars of the house, adding in support beams etc.)
If I'm not mistaken, I'd say that the doors will be the very last thing to cut out after anything else in the design has been finalised to make workflow go a bit smoother.
With the Knife Tool doors and windows can easily be cut into an existing mesh. After pressing K select where to cut when finished press Enter
You can constrain the angle axis C also make sure that cut through is switched off (Z).
