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I made a push up animation with a human character and its hands are moving down and upwards. Can I somehow fix the position of the hands? I mean in a way not to be able to move/rotate it.

My problem is something like the push up part in this video: https://www.youtube.com/watch?v=-r7mWDgQbmU

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  • $\begingroup$ So you are using an armature? You need to use inverse kinematics constraints. Search for tutorials about that. Here is one to get you started youtu.be/DZ_ocmY8xEI $\endgroup$
    – kim holder
    Mar 17, 2018 at 3:33

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Here's the simplest version of an arm rig:

  • upper arm, lower arm and hand are one connected chain
  • upper arm is parented to body with offset
  • hand has a Copy Rotation Constraint to hand target. Both bones have the same rotation. Using hand instead of hand target prevents the hand from getting torn apart when you accidentally move hand target too far away.
  • lower arm has an IK constraint to hand target, chain length 2. That means blender will rotate lower arm and upper arm to somehow reach hand target.
  • upper arm, lower arm and hand are deforming the character mesh while hand target is exclusively for animation.

If you want to animate the arm, move hand target. If you want to do pushups, move body. The arm takes care of itself.

Such rigs can become much more complex, and be it just to have control over the elbow. But the principle is usually similar.

up and down and up and down

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