Calculate co-ordinates along raycast

Questions
1

Hi

Is it possible to calculate the co-ordinates of a point say 75% of the distance between the origin of the ray (the camera) and the intersect point?

2

chatgpt:“for threejs calculate vector at 75% between camera and raycasted object”

// Create a raycaster
const raycaster = new THREE.Raycaster();

// Set the raycaster’s origin to the camera’s position
raycaster.setFromCamera(new THREE.Vector2(), camera);

// Check if the raycaster intersects any objects in the scene
const intersects = raycaster.intersectObjects(scene.children);

// If there are any intersecting objects
if (intersects.length > 0) {
// Get the first intersecting object
const intersectedObject = intersects[0];

// Get the position of the intersected object
const intersectedObjectPosition = intersectedObject.object.position;

// Calculate the vector between the camera and the intersected object
const cameraToObjectVector = intersectedObjectPosition.sub(camera.position);

// Calculate the vector at 75% between the camera and the intersected object
const halfVector = cameraToObjectVector.multiplyScalar(0.75);
const vectorAt75Percent = camera.position.add(halfVector);

// Do something with the vector at 75% (e.g. move another object to that position)
}
:wink:

3

This line will change position of the camera. camera.position.clone().add(halfVector) will work.

Moreover, the task involves the point of intersection, not position of the intersected object. Thus, intersectedObject.point, instead of intersectedObject.object.position.

I would solve the task with let v3at75percent = new THREE.Vector3().lerpVectors(camera.position, intersectedObject.point, 0.75);

But who am I to argue with AI :thinking:

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