topic Re: Make two joints in an IK chain rotate the same in Maya Animation and Rigging Forum https://forums.autodesk.com/t5/maya-animation-and-rigging-forum/make-two-joints-in-an-ik-chain-rotate-the-same/m-p/12966387#M609 <P>By "the same", I'm assuming you mean the same rotation angle?&nbsp; You can setup a normal 2 joint ik chain to drive your 3 joint chain.&nbsp; To achieve the same rotation angle, just adjust the length of the second joint in the 2 joint chain.&nbsp; Simple equation for a triangle should solve this for you.<BR /><BR />cos(C) = a^2 + b^2 - c^2 / 2 * a * b<BR /><BR />C is the angle opposite side c of your triangle.</P> Mon, 19 Aug 2024 02:01:05 GMT mcw0 2024-08-19T02:01:05Z Make two joints in an IK chain rotate the same https://forums.autodesk.com/t5/maya-animation-and-rigging-forum/make-two-joints-in-an-ik-chain-rotate-the-same/m-p/12961430#M608 <P>So I have an IK setup like this:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="temp.PNG" style="width: 632px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1398416i92515D29B45593C4/image-size/large?v=v2&amp;px=999" role="button" title="temp.PNG" alt="temp.PNG" /></span></P><P>Double-jointed elbows and knees. Is there a way to make the two joints in the middle rotate the same?</P> Thu, 15 Aug 2024 18:31:50 GMT https://forums.autodesk.com/t5/maya-animation-and-rigging-forum/make-two-joints-in-an-ik-chain-rotate-the-same/m-p/12961430#M608 littonce 2024-08-15T18:31:50Z Re: Make two joints in an IK chain rotate the same https://forums.autodesk.com/t5/maya-animation-and-rigging-forum/make-two-joints-in-an-ik-chain-rotate-the-same/m-p/12966387#M609 <P>By "the same", I'm assuming you mean the same rotation angle?&nbsp; You can setup a normal 2 joint ik chain to drive your 3 joint chain.&nbsp; To achieve the same rotation angle, just adjust the length of the second joint in the 2 joint chain.&nbsp; Simple equation for a triangle should solve this for you.<BR /><BR />cos(C) = a^2 + b^2 - c^2 / 2 * a * b<BR /><BR />C is the angle opposite side c of your triangle.</P> Mon, 19 Aug 2024 02:01:05 GMT https://forums.autodesk.com/t5/maya-animation-and-rigging-forum/make-two-joints-in-an-ik-chain-rotate-the-same/m-p/12966387#M609 mcw0 2024-08-19T02:01:05Z