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Question by nicmarxp · Jun 28, 2019 at 10:07 PM · 2d aiming inverse kinematic

How to aim gun using 2D IK with a fixed elbow rotation?

I'm doing an "aim-gun-towards mouse" with a 2D skeletal character with 2 bones, ArmUpper and ArmLower (hand is fixed) and I think I need some kind of IK solver. Here are the parameters:

ArmUpper: Fixed position in the shoulder, but can rotate freely

ArmLower: Has a fixed rotation (depending on weapon type), and it's position is set by rotating ArmUpper, which makes it end up somewhere in the green circle

The question: How can I calculate the rotation of ArmUpper so that both ends of ArmLower aims towards the target reticle?

I'm making this with Unity in C#, but any pseudo-code or formula will help.

Thanks!

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