What steps can I take to prevent Transform Control from displacing my object in the event of a collision, by utilizing raycasting?

Question

What steps can I take to prevent Transform Control from displacing my object in the event of a collision, by utilizing raycasting?

Currently, I am working with Three.js and have a situation where there are cubes inside a box. The Transform Control is being used to manipulate the position of the cubes within the box using the mouse. My goal is to implement raycasting to detect collisions. Is there a way to prevent the transform controller from moving the cubes if a collision occurs, specifically when it hits a wall? For reference, my Three.js version is r81.

UPDATE: I've managed to restrict the movement of the cubes within the room by using the size of the space. This method has been effective so far. However, I am wondering if cannon.js can be utilized solely for collision detection without incorporating momentum, gravity, or other features. My aim is to only check for collisions and halt movement upon impact.

javascript 3d three.js cannon.js

Answer 1

Answer №1

Although this post may be dated, I hope it can assist someone searching for a solution. While I couldn't prevent the user from moving my object, I managed to swiftly return it to its correct position by incorporating some logic into the render method.

As for the initial issue of collisions mentioned by the author, one could listen for events on the transform controls and prompt the object to readjust if it ends up in an impermissible state.

transformControls.addEventListener('objectChange', (e) => {
  if (illegalPosition(this.obj.position)) {
    needsReset = true;
  }
  lastPosition = attachedObject.position.clone();
});

Subsequently, within your render function:

if (needsReset) {
  attachedObject.position.set(lastPosition.x, lastPosition.y, lastPosition.z);
}

While this approach may seem somewhat unconventional, especially for those who lack the time or expertise to delve into TransformControls.js, I believe it could prove beneficial.

Answer 2

Although this post may be dated, I hope it can assist someone searching for a solution. While I couldn't prevent the user from moving my object, I managed to swiftly return it to its correct position by incorporating some logic into the render method.

As for the initial issue of collisions mentioned by the author, one could listen for events on the transform controls and prompt the object to readjust if it ends up in an impermissible state.

transformControls.addEventListener('objectChange', (e) => {
  if (illegalPosition(this.obj.position)) {
    needsReset = true;
  }
  lastPosition = attachedObject.position.clone();
});

Subsequently, within your render function:

if (needsReset) {
  attachedObject.position.set(lastPosition.x, lastPosition.y, lastPosition.z);
}

While this approach may seem somewhat unconventional, especially for those who lack the time or expertise to delve into TransformControls.js, I believe it could prove beneficial.

Answer 3

Answer №2

To improve collision detection, consider creating a helper raycaster and organizing all colliders into distinct containers. Once an object is moved, position the raycaster accordingly to check for intersections with other objects in the container. If a collision occurs, revert back to the previous position of that object. For cube colliders, it may be beneficial to cast rays from the center of the cube in various directions using half of the side length as the length of the ray.

Answer 4

To improve collision detection, consider creating a helper raycaster and organizing all colliders into distinct containers. Once an object is moved, position the raycaster accordingly to check for intersections with other objects in the container. If a collision occurs, revert back to the previous position of that object. For cube colliders, it may be beneficial to cast rays from the center of the cube in various directions using half of the side length as the length of the ray.

Answer 5

Answer №3

Implementing collision detection with transform controls can be made painless thanks to Ben S's method. By setting up a render call within a loop at 60 fps using "requestAnimationFrame", you can prevent objects from moving past the point of collision.

It's unclear whether Ben S was aware of "requestAnimationFrame" when writing his answer, but this function is essential for achieving smooth collision detection without resetting the model's position.

function animate() {
    // Render onto screen every frame (60fps).
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
}

By incorporating this loop into your code and adding an event listener, you can efficiently handle collision detection without disrupting the rendering process.

control.addEventListener('objectChange', (e) => {
    // Implement collision detection here by adjusting the colliding model's position.
    // No need to reset it in render.
});

Answer 6

Implementing collision detection with transform controls can be made painless thanks to Ben S's method. By setting up a render call within a loop at 60 fps using "requestAnimationFrame", you can prevent objects from moving past the point of collision.

It's unclear whether Ben S was aware of "requestAnimationFrame" when writing his answer, but this function is essential for achieving smooth collision detection without resetting the model's position.

function animate() {
    // Render onto screen every frame (60fps).
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
}

By incorporating this loop into your code and adding an event listener, you can efficiently handle collision detection without disrupting the rendering process.

control.addEventListener('objectChange', (e) => {
    // Implement collision detection here by adjusting the colliding model's position.
    // No need to reset it in render.
});

What steps can I take to prevent Transform Control from displacing my object in the event of a collision, by utilizing raycasting?

Answer №1

Answer №2

Answer №3

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