What is the best way to implement collision detection using raycasting?

Question

What is the best way to implement collision detection using raycasting?

For my university project, I am looking to implement collision similar to what is shown in this example. However, I am facing an issue where collision is only working on the top of the object. I referred to this for guidance. My goal is to add collision to the sides of the object cube. How can I achieve this? Which parameter should I modify for this purpose? I attempted to make changes as follows:

    raycaster.ray.origin.y -= 10;
    raycaster.ray.origin.x -= 0;

However, I observed that this adjustment affects the upper collision position. I have a possible solution in mind, but I lack an understanding of its functionality. Here is the code snippet:

raycaster = new THREE.Raycaster( new THREE.Vector3(), new THREE.Vector3( 0, -1, 0 ), 0, 10 );

UPDATE

Following Ivan's suggestion, I have managed to prevent the player from passing through boxes. However, a new problem arises when I approach a box too closely - I get stuck and cannot move at all, even if the box is not visible to the camera. This results in the velocity on the x or z axis becoming zero. How can I resolve this issue?

UPDATED CODE:

javascript three.js

Answer 1

Answer №1

Looks like you're making progress with the raycaster line.

raycaster = new THREE.Raycaster( new THREE.Vector3(), new THREE.Vector3( 0, -1, 0 ), 0, 10 );

Based on your snippet, it seems like the raycasting/jumping on the ground plane is functioning properly. Are you trying to prevent the player from moving into boxes in the world?

One approach could be to add another raycast in the direction the player is moving to check for obstacles in the way. By feeding the player's position and direction into the raycaster, it will cast a ray from the position towards the direction. Perhaps something like this?

This is just a basic concept, you might want to refine it further, possibly by using bounding boxes. Here's an example you can refer to:

function animate() {
    // Animation function code goes here
}

Answer 2

Looks like you're making progress with the raycaster line.

raycaster = new THREE.Raycaster( new THREE.Vector3(), new THREE.Vector3( 0, -1, 0 ), 0, 10 );

Based on your snippet, it seems like the raycasting/jumping on the ground plane is functioning properly. Are you trying to prevent the player from moving into boxes in the world?

One approach could be to add another raycast in the direction the player is moving to check for obstacles in the way. By feeding the player's position and direction into the raycaster, it will cast a ray from the position towards the direction. Perhaps something like this?

This is just a basic concept, you might want to refine it further, possibly by using bounding boxes. Here's an example you can refer to:

function animate() {
    // Animation function code goes here
}

What is the best way to implement collision detection using raycasting?

Answer №1

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