I downloaded a model from a website and got permission to use it for non profit/open source projects.

Problem is that I cant use Ctrl+R to divide the faces into smaller multiple faces.

If I use W> Subdivide I get more or less the result I need (far from perfect but it can/could work), but the faces have triangles inside them, causing too many faces that wouldnt crash realistically. Is there an alternative to Ctrl+R or a way to get Ctrl+R working again and remove triangles inside the faces (whithout deleting the faces) where I dont need them? If I remove them manually using X then W> Subdivide wont create vertical edges I need.

I cant use Ctrl+R to do it, any alternative way to do it? If I use knife to do it (easiest way) the edges I get are not vertical.

If I use W> Subdivide I get too many diagonal edges from my current diagonal edges (most of which I dont need, but if I remove them then W> Subdivide does nothing.

Any ideas how to fix it?

This is what I want:

Top view Pink = edges I need to create enter image description here

This is what it should look like(12+ or so little square faces per body panel):

enter image description here

  • $\begingroup$ Sadly I am too much of a amateur to help other blender users(started using a month or so ago) and hence its hard for me to get 10 reputation to post all the pics and info I need on my main post...... $\endgroup$
    – Justaparps
    Aug 15, 2017 at 13:52
  • $\begingroup$ This is a copy of my project file in .zip: drive.google.com/open?id=0B6vRqq08Rx2Ja2pIRFNpTEZyZWM and this is those little square faces I need to create on my project model, every bodypanel has 12+ of those: wiki.beamng.com/images/thumb/9/9b/… $\endgroup$
    – Justaparps
    Aug 15, 2017 at 13:53
  • 2
    $\begingroup$ The knife tool will make straight cuts. You must be in Orthographic Perspective and in something like [Top, Front, Right] View. Once you begin the Knife Tool, press "C" to constrain it to 90 degrees. $\endgroup$
    – bertmoog
    Aug 15, 2017 at 14:27
  • $\begingroup$ You should first understand why CTL+R does not work. CTL+R is used to add and edge loop. Blender can create edge loop only on quads ('squares'). So with Triangles CTL+R does not work. $\endgroup$ Aug 16, 2017 at 14:43

3 Answers 3


You might want the Knife tool (the K tool in edit mode). https://docs.blender.org/manual/en/dev/modeling/meshes/editing/subdividing/knife_subdivide.html . It lets you divide faces along a line you choose.

knife tool in action

If you decide those vertices aren't in the exact right place you can use Vertex Slide Shift+V to slide them into the right place.

If that model's triangulation is a problem and you want to turn them back into quads, consider the Dissolve Edges operator (in the X menu.

  • $\begingroup$ Currently trying it out! seems to work for now! $\endgroup$
    – Justaparps
    Aug 15, 2017 at 15:20
  • 1
    $\begingroup$ <kbd> Formatting represents keys on your keyboard. You do not have a key on your keyboard which says 'shift-v' (nor do you have lowercase letters). That, and trying to conform your formatting to the way kbd formatting is shown on the rest of the site was why I edited your answer. Unless it was accidental, I don't understand why you have undone that edit. $\endgroup$ Aug 15, 2017 at 15:54
  • $\begingroup$ I was in the middle of adding a paragraph about Dissolve Edges and it must have stomped on your edit. $\endgroup$
    – Mutant Bob
    Aug 15, 2017 at 18:18
  • $\begingroup$ Evidently there are keyboards with lowercase letters: productforums.google.com/d/msg/chromebook-central/PNqWLYEgpHQ/… and it is not universally popular. $\endgroup$
    – Mutant Bob
    Aug 15, 2017 at 18:21
  • $\begingroup$ Thank you for your help! You guys have been really useful, especially you and Stéphane Monté(him whit the disolve angle trick)! $\endgroup$
    – Justaparps
    Aug 18, 2017 at 16:48

Maybe you can use bisect.Select the faces that you want to be divided then select bisect from the toolbar.enter image description here


With the knife tool to have a perfectly straigth cut what you should do:

Select all the triangles in the hood and X -> Select dissolve, set the angle to 0.2°. You should end up with that :

After limited dissolve

Then you need to create extra vertices the border edges of the hood, as much as cut that you need. Select the edges and subdivide them.

 Subdivide the edges

Then use the knife tool to cut the faces by relying on the newly created verticies.

Cut the faces

And Voila! Much better topo and not shading problem.

enter image description here


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