What's the fastest way to turn a triangular face into three quads?

Question

score 24 · Accepted Answer · edited Sep 16 '18 at 10:10

24

Subdivide triangle. Select face of middle triangle. Repeat. Select inner vertices and use AltM to merge at centre.

My 5 cents. What's yours?

p.s. no need to go into vertex mode. Face select and AltM is enough.

edited Sep 16 '18 at 10:10

sam1370

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answered Jul 09 '17 at 18:51

Patdog

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It is also possible to: Select triangle in middle -> Poke Face -> Select All -> Tris to Quads – Jul 10 '17 at 18:54

score 17 · Answer 2 · edited Sep 16 '18 at 06:40

17

Subdivision Surface modifier with Simple mode

Just add to your object a subdivision surface modifier from the list and choose the Simple option.

This method is obviously not good if you would like to subdivide only a subset of faces of your object as the modifier is being applied to the whole object (in this case made of a single face).

edited Sep 16 '18 at 06:40

sam1370

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answered Jul 09 '17 at 19:02

Carlo

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Still a nice one... – Jul 09 '17 at 19:07
This is actually the best solution I have seen so far, only requires like three button presses – sam1370 Sep 16 '18 at 01:33

Timaroberts · Answer 3 · 2017-09-12T23:49:34.013

I guess you could always use the shortcut and not model it all. :)

The Add Mesh Extra Objects Add-On has been updated in version 2.79 and now includes a triangle object. It is found under Add Mesh>Math Function>Triangle. There are options for 3 and 6 quad faces, and 3 tri faces.

If you do not have it enabled already, just enable it in user preferences with Ctrl+Alt+U and search for 'extra'.

Here is an example gif:

score 5 · Answer 4 · answered Jul 09 '17 at 20:25

5

@Carlo presented the perfect solution IMO- the fastest one indeed. Here are my 5 cents though:

Subdivide the triangle with W-->Subdivide, then inset faces with I and input the proper scale value to place all the vertices in the center of the object. Press W-->Remove Doubles. Finally select some edges and get rid of them with X-->Limited Dissolve.

answered Jul 09 '17 at 20:25

Paul Gonet

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That's also nice. Tris to Quads also works as last step, btw. – Jul 10 '17 at 05:02

score 2 · Answer 5 · answered Sep 16 '18 at 13:00

Bmesh script

Checks selected element is tri.
Removes tri face.
Bisects the edges.
Make edges from bisect verts to tri's median centre.
Fill new edges and bisect edges with contextual create (akin to F)

Select triangle face in edit mode run script.

import bpy
import bmesh

context = bpy.context
ob = context.edit_object
me = ob.data
bm = bmesh.from_edit_mesh(me)

tri = bm.select_history.active
# poll .. do we have a tri
if isinstance(tri, bmesh.types.BMFace) and len(tri.verts) == 3:
    edges = tri.edges[:]

    c = tri.calc_center_median()
    bm.faces.remove(tri)
    ret = bmesh.ops.bisect_edges(bm, edges=edges, cuts=1)
    verts = ret['geom_split'][:3]
    c = bm.verts.new(c)
    geom = ret['geom_split'][3:] +  [bm.edges.new([c, v]) for v in verts]  
    bmesh.ops.contextual_create(bm, geom=geom)
    bmesh.update_edit_mesh(me)

What's the fastest way to turn a triangular face into three quads?

5 Answers5

Subdivision Surface modifier with Simple mode

Linked