Hi, I want to cut the area outside the red rectangle. I’ve tried everything I can think of (I started using Blender today). Everything is mesh.
Also, I’d like to fill it, like this:
https://youtu.be/-QfLdbzSZdw?t=83
I hope you can help me!
Thank you!
The Bisect tool is now here, press on this button for several seconds and select the Bisect tool:
then cut the shape, and in the Operator box (bottom left of the 3D view) choose Clean Inner (or Outer, depending on the part you want to cut):
Hi!
I’ve tried this but didn’t worked 
When I select it, all I can see is a black mesh. With the plane it seems different, completly blue.
You must select all your objects. If it looks black it’s probably because the mesh is very dense. I don’t know why it looks blue.
Yes but please do a cube over the area and use intersect instead of building a complex shape around. 
Thanks for the tips, I’m not using often booleans. That’s said if the final shape for the cut isn’t a cube, I’m not sure if one method is better than the other one.
It worked perfectly! I also used the tip from Ztreem.
Thank you very much!
