I have a problem I have been tied up all the day with and I haven't solved yet. I am trying to cut the walls of this house along the inclined pitches of this house. Any ideas? I have tried almost all, add-ons, boolean operations etc. I think that the best way in this case would be to cut the vertical walls along the intersection between the roof and the walls themselves (pic. 1). Another option would be to extend the walls up underneath the pitches, but as you can see there are different heights and there are no snapping points to use and this is so annoying ;) Please be quite clear because, in spite of my age, I am a newbee. Thanks.
In this case, there should be no difficulty using Knife Project.
- Select the roof, then the building
- Put the (active) building into Edit Mode.
- In an Orthographic view, looking straight down the roof ridge, hit 'Knife Project' in the Tool Region, Tools tab, Add section.
- In the Knife Project tool's own panel, check 'Cut through'.
- V Rip the newly created edges
- Hovering over the unwanted faces, L select all linked, and delete them.
The Shrinkwrap modifier is a flexible friend in such a situation. Its basic use is to dynamically snap elements of your mesh onto another target mesh object. This can also be limited to a Vertex Group, which is a collection of Vertices you define yourself.
To do that, use Ctrl + G after selecting the top row of vertices of your mesh, and confirm the menu that pops up:
You can find the new Vertex group in the Mesh Data tab in case you need to modify it later on (add or remove vertices):
Now add a Shrinkwrap Modifier to the walls mesh object:
Set the Mode to Project, and define target object (your roof mesh) and the Vertex group (collection of vertices that should change position). Also remember to set the projection axis (in my case Z):
Final result should look like this: