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I created a quadruped character, and added ik bones to the legs, but the problem is the knees start clipping when it bends. i tried to see if changing the weight paint would help, but it just got worse. How can i make the knees bend softly, without clipping?

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    $\begingroup$ First, use Google Images to look for pictures of "knee topology". Then, look up "corrective shapekey" techniques. $\endgroup$
    – Nathan
    Jan 15, 2021 at 19:11

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I've tried the following things and it seems to work:

  • Enable the Armature modifier's Preserve Volume option

  • I've added an edge loop above the joint:

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  • I've segmented the small bone:

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  • I've extended a bit its influence upwards in Weight Paint mode, use Mix, Substract, use also the Blur brush:

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  • And I've extended a bit the influence of the top leg downwards:

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A try with 2.79, I 've added a Pole Target to make it bend correctly:

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