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I am faced with a problem about merging two object with clean topology in a short time.

I have looked for any shortcut or addon that solve this problem, but have as of yet been unlucky.

surface

Surface

wire

Wire

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  • $\begingroup$ Hi and welcome to the site. Please add more information about what you want to achieve. You may also have a look at the toor to learn how to ask well formulated questions which leads to best possible help from the community. $\endgroup$ – Dan May 23 '16 at 11:10
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    $\begingroup$ Merging two objects (in object mode) is done by selecting them both and "CTRL+J". But here you are allready in edit mode. So they are allready in one object so they are merged. $\endgroup$ – lemon May 23 '16 at 11:19
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Idle Chit-chat

I have come up with a way of doing it that has many steps, but turns out a nice result.

How to Do It

Start by selecting a single vertex of your sphere in Edit Mode and keying Ctrl + L to select the rest of it. Then key P and click on Selection. This should seParate your sphere from the cube mesh. Tab into Object Mode.

Now select the cube and go to the Object modifiers tab in the Properties panel. Add a Boolean modifier. Set the settings to the following. Substitute the name of your sphere mesh for where it says "enter image description here"

Settings for Cube Boolean Modifier

If you key Z to enter wireframe mode, your meshes should look something like this.

enter image description here

Apply the Boolean modifier by clicking the Apply button.

Make sure you are in Orthographic View (toggle with Numpad 5). Key Numpad 1, Numpad 3, or Numpad 7 until you are looking at the side of the two meshes like this.

enter image description here

Tab into Edit Mode, toggle Z into wireframe view, and Box select these verticies.

enter image description here

Key X and select Verticies. Tab into Object Mode. Key R, then Z, then 90 to rotate the hole in your cube away from the sphere.

Select the sphere and go to the Object modifiers tab in the Properties panel. Add a Boolean modifier. Set the settings to the following. Substitute the name of your cube mesh for where it says "enter image description here".

enter image description here

If you key Z to toggle wireframe view, your meshes should look something like this.

enter image description here

Apply the Boolean modifier by clicking the Apply button. Select the cube and key Alt + R. The hole on the side should go back to facing the sphere.

Select the sphere mesh, then Shift + RightMouseButton select the cube mesh. Key Ctrl + J to join the two. Tab into Edit Mode. Key A once or twice to select all of both meshes, key W, and click on Remove Doubles from the popup menu.

Here is a finished .blend file with the two joined meshes.

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  • $\begingroup$ The end result of this answer is achieved in 2 clicks by adding Boolean modifier set to Difference for both meshes, you'll end up with sphere cut off with cube and a hole between them. Whereas the OP asks about clean topology (which is definitely not the case with your solution). And how does that unclear Idle Chit-chat help to understand the answer ? What is its purpose ? $\endgroup$ – Mr Zak May 23 '16 at 14:45
  • $\begingroup$ @MrZak My "Idle Chit-chat" has no purpose. It is purely meant to set the scene/be humorous. In fact, Google defines idle as without purpose or effect; pointless. $\endgroup$ – Shady Puck May 23 '16 at 21:53

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