Summary
The issue at hand is the inability to drag a GLB model using DragControls in a Three.js application. Despite setting up the DragControls and assigning the model to be dragged, the model does not respond to drag events.
Root Cause
The root cause of the issue lies in the incorrect assignment of the object to be dragged. In the provided code, const dragControls = new DragControls(moveMiku, camera2, renderer.domElement); references moveMiku, which is not defined anywhere in the code. The intended object to be dragged, model, is assigned to moveModel, but this array is not correctly passed to the DragControls constructor.
Why This Happens in Real Systems
This issue can occur in real systems when there are typos or incorrect variable references in the code. It can also happen when the developer is not aware of the correct usage of the DragControls class or has not properly set up the scene, camera, and renderer.
Real-World Impact
The inability to drag the model can significantly impact the user experience of the application. It may lead to frustration and confusion for users who expect to be able to interact with the model in this way.
Example or Code
const moveModel = [model];
const dragControls = new DragControls(moveModel, camera2, renderer.domElement);
dragControls.transformGroup = true;
dragControls.enabled = true;Note that the correction involves passing the correct array moveModel to the DragControls constructor.
How Senior Engineers Fix It
Senior engineers would identify the issue by carefully reviewing the code, checking for any typos or incorrect variable references. They would then correct the assignment of the object to be dragged, ensuring that the correct array is passed to the DragControls constructor.
Why Juniors Miss It
Juniors may miss this issue due to a lack of experience with the DragControls class or Three.js in general. They may not be aware of the correct usage of the class or may overlook the typo in the variable reference. Additionally, juniors may not have developed the habit of carefully reviewing their code for errors, which can lead to these types of issues going unnoticed.