lanyard-home was forked from 3d home page setup

Continue chatting to ask questions about or make changes to it.

I understand the error you're encountering. The issue is likely caused by trying to access ref.current before it has been initialized. Let's modify the Band component to address this error. We'll use the useRef hook to create an array of refs for each point, and then use these refs in the RopeJoint components.

Here's the revised Lanyard.tsx file:

Here are the key changes made to address the error:

1. We've created an array of refs using useRef in the Band component:

   const refs = useRef<any[]>([])

2. We initialize this array of refs in the useEffect hook:

   refs.current = newPoints.map(() => ({ current: null }))

3. We've updated the RigidBody components to use these refs:

   <RigidBody key={index} position={point} ref={(el) => (refs.current[index] = el)} ... >

4. In the RopeJoint components, we now use these refs directly:

   <RopeJoint key={`rope-${index}`} bodyA={refs.current[index - 1]} bodyB={refs.current[index]} length={spacing} />

5. We've also simplified the RopeJoint component to use the useRopeJoint hook directly, without needing to pass pivotA and pivotB:

   const RopeJoint = ({ bodyA, bodyB, length, }: { bodyA: any bodyB: any length: number }) => { useRopeJoint(bodyA, bodyB, [ [0, 0, 0], [0, 0, 0], { length, damping: 0.1, stiffness: 100, }, ]) return null }

These changes should resolve the "ref.current is null" error by ensuring that we're not trying to access ref.current before it's been initialized. The RigidBody components are now properly referenced, and the RopeJoint components use these references correctly.