How can I do this. extrude a shape into and another one

Support Modeling
1

Hey everyone. I’m going to try and explain this the best I can. How can I extrude a shape into and another one. Example, say I have a cube that is subdivided very highly that has a grid like wireframe, then I want to have cylinder style extrusion inward. How can I do that without placing the cubes vertices individually? I’ve provided this pic from someone elses model to try and explain. (sorry this isn’t a good explanation.) Notice how the the model has a uniform wireframe expect for right around the screws where they become circles. Is there a simple way of doing this or is all by subdividing high and then placing vertices accordingly? Even the screws themselves have this trick going on with the philips shape going inward to a sphere.


Thanks

2

To make a circle inside of a grid-like topology

Select a squared or rectangular loop of vertice
http://i.imgur.com/rsaxueM.jpg

If you have the Loop Tools addon enabled (File -> User Preferences -> Addon panel -> Mesh category -> enable “Mesh:Loop”) and click in the Toolshelf on the Looptools “Circle” button (or press W -> Loop Tools -> Circle)
http://i.imgur.com/R7EQsT9.jpg

Or click on Mesh -> Transform -> To Sphere and move the mouse to the maximum value, or just type 1

Note : sometime Loop Tools “Circle” does not give a nice result , while sometime ToSphere does and vice-versa, always check what will be better, in the exact case i posted, the loop tool "circle would have rotated a bit the circle for unknown reason, while ToSphere will make it as i wanted.

http://i.imgur.com/0aKbjuP.jpg

After that, the subsurf will smooth the topology.

3

if you need lower res model
you could also use a normal map to do this !

happy cycles

4

Here is another way to get a similar topology as the image you posted without moving any verts by hand. Note: This topology is wasteful and incorrect, but it does match what you requested.

  1. Add a plane. Edit mode, ‘X’ only faces.

  2. Select all verts (‘A’), Subdivide 3 times (‘W’) (32 verts). Still in EDIT mode, add mesh - circle (32 verts). Scale the circle down.

  3. Select all verts (plane and circle) and ‘W’ -> Loop tools -< Bridge.

  4. With the cursor between the plane and circle, Ctrl - ‘R’ and scroll the mouse wheel up, to add a bunch of loop cuts.

Then do your extrusion. This could also work on the phillips head indentation. Of course you need exactly the same number of verts in both loops to bridge them.

bridge.jpg1130×290 157 KB

5

Thanks everyone. Thats what I was looking for :slight_smile: