How would you cut a shape out of an object using another object?

Coming from SketchUp one of the tools I miss most is the circle draw tool which lets you draw a circle on any face and then you could extrude it in/out. The only tool that I know of that comes close to this is the knife tool but this would be very impractical to cut out with the knife

Example:

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Is there any tool in blender that can match this function? also how could you do this with squares?

Answer

Knife Project Tool

Edit: Since 2.9, the Knife Project tool works this way:

  • Select the object you want to edit, switcht to Edit mode.
  • Ctrl left click to select the cutter object.
  • Go in the header menu > Mesh panel > Knife Project.

The tool you are looking for is the Knife Project tool. Here’s how to use it:

  1. Create your cube that you want to put the circle on
  2. Add a circle curve: SHIFTA -> Curve -> Circle
  3. Position the circle in front of the face you want to put the circle on, as shown here (highlighted in green):

enter image description here

  1. Now go to the viewport where the circle visually appears where you want your circle to be on your cube, like this:

enter image description here

  1. Now select the circle, then hold down SHIFT and select the cube.
  2. Switch into Edit mode
  3. Tools panel (T) -> Mesh Tools section -> Add section -> click Knife Project
    (Note: In 2.70, the Mesh Tools section is located in the Tools tab)

This will result in the cube now having a circular hole in the front face:

enter image description here

  1. If you now want to fill the hole with a face, select all the vertices of the hole and press F.

NOTE: In this example, the circle is considered the Knife, which is kind of like a cookie cutter, or perhaps even a bullet, and so when you click on the Knife Project button, what Blender does is it projects/shoots the knife (here the circle) from the visual angle in your active viewport. So, make sure you have the knife visually lined up so that when it projects/shoots onto your destination object, it will make the circle right where you want it. Here are two examples of projecting from different angles:

enter image description here

An interesting note is that in the example above where the knife is visually at an angle, the resulting face on the destination object is NOT automatically deleted (see the highlighted face on the lower example.)

Also, you can indeed use any shape as a knife:

enter image description here

Attribution
Source : Link , Question Author : Qwertie , Answer Author : moonboots

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