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I made a blender IK rig for character that I was modeling. The knee bone bends, but the mesh does not. No matter what type of weight painting I do, the mesh doesn't bend, it just deforms and twists. I also tried rotating the pole target around, but that didn't help.

Here are some screenshots:This is the weight for the lower part of the leg

Here is what happens when I try to bend the knee

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  • $\begingroup$ Looking at the mesh in the images, looks like you don't have enough geometry to achieve the bending action, do you have an edge loop where the knee is? $\endgroup$
    – Georges D
    Commented May 29, 2016 at 16:44

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The bones can effect only the vertices position, it looks like your leg has only 4+4 vertices. Try subdividing it (in three different ways):

  1. Add a subsurf modifier (upper in the modifier stack than the armature modifier)

  2. Using the loop ring tool (shortcut Ctrl+R)

  3. Selecting the mesh in edit mode then hitting W> Subdivide

Search the internet for typical mesh geometry for a good deforming leg and copy the topology.

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  • $\begingroup$ Thanks for getting back so quickly. I just added loop cuts at where the knee joints were and now I just need to do some weight painting and it should work. Thank You! $\endgroup$
    – AidanYtgr
    Commented May 29, 2016 at 16:54
  • $\begingroup$ I've noticed a few of your answers have been edited to include kbd formatting. Kbd formatting helps to indicate a button press and helps it to stand out within sentences. Just something to consider for future answers :) $\endgroup$
    – Ray Mairlot
    Commented May 29, 2016 at 20:24
  • $\begingroup$ Thank you Ray, where can I find infos about how to do kbd formatting? $\endgroup$
    – josh sanfelici
    Commented May 31, 2016 at 9:47
  • $\begingroup$ @joshsanfelici it's html, kbd stands for keyboard I guess: <kbd>X</kbd> will appear as a keyboard button with the letter X in it $\endgroup$
    – Georges D
    Commented Jun 2, 2016 at 23:52

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