Three js mesh collision js, this Aug 25, 2025 · We need to create a mesh that represents all the static objects in the scene, everything that should be considered a collidable thing. js region. Feb 11, 2015 · How to detect collision between two objects in JavaScript with Three. raycaster is working fine with ThreeJS objects i. js and I am creating the environments in blender and exporting them as . html (3. Physics is probably easier if you need parts of the game world to move around or be animated, like a platformer. js, but it was originally built to be used with Three. Does anyone know of a cheap collision detection method? Grtz. shapecast( { intersectsBounds: box => box. This is great for simulating collision. This is something that I originally had a little trouble with as the character would sometimes get stuck in an object. Jul 18, 2018 · Two example of collision of obj models of 3D, is this feasible? I did not find such an example in the three. But I want when the ‘Mario’ check the collision with any bricks around the scene, it repels, like Super Mario 64. js meshes. I Jan 25, 2024 · In three-mesh-bvh game example, from what I understand, the following is responsible for checking intersections and calculating the offset needed to not intersect. I’m trying to detect collisions among the components of my models and I realized recently that using a Skeleton to animate the models makes this somewhat difficult. The project includes a sidebar on the right side, where users can drag and drop cabinet images in sidebar into the 3D scene. js has methods to detect collisions of 3d objects without using a physics engine. Jan 1, 2024 · You could check out the THREE-Mesh-bvh library if you’re trying to handle collisions between unknown geometries. Using the following library: GitHub - gkjohnson/three-mesh-bvh: A BVH implementation to speed up raycasting and enable spatial queries against three. js is its ability to handle collision events between 3D objects, enabling the creation of immersive games and realistic 3D visualizations on websites. js? Asked 10 years, 8 months ago Modified 3 years ago Viewed 16k times Feb 7, 2022 · Hello all. Here’s the glitch to get better visuals: I also made a collision detection that works by checking the intersection between the bounding box of the geometry colliding. Apr 30, 2018 · I’m working on a project for which I want to animate some models/meshes procedurally. You also want to cease movement when a collision is detected which would only put the collision detection in an infinite loop. collider. Introduction In this article I will show you how to add collision detection to your game. So I can successfully access that box three and get its parent elements so that I can get its world position, but for some reason I cannot make collision Dec 20, 2024 · Im looking for someone to help me implement collision resoultion with cubes. It works but is slow on my laptop. And i would prefer to do it with raycaster (if it’s possible…) and yeah i’ve searched for collision detection, but didn’t find lot related to blender and three. Feb 23, 2024 · So I’ve been working on making an amazing collision detection boilerplate code with three js. Issue: In the screenshots below, you can see how a translated chair can go through the table. Collision Detection using OBB Description If you don't need physics simulation, but you still want some kind of collision detection, one option you have is to use an Oriented Bounding Box (OBB). Peter_Devine July 4 Description While raycasting is almost always used for mouse picking objects in the 3D scene, it can also be used for simple collision detection. May 18, 2021 · Hello! I wanted to share the three-mesh-bvh package I maintain which, among other things, can be used to greatly improve raycasting performance by multiple orders of magnitude against highly complex geometry as well as enable a variety of spatial queries against the triangles. I need solution which moves object +1 to z-coord until it collides. boundsTree. Jun 30, 2020 · I’m new to THREE. May 28, 2020 · You can use threejs threeverse engine to load gltf assets with gltf collision this would be easier to accomplish creating an open world or any threejs virtual experience or games. Mesh. js, so it will be quite easy to begin using in your project. For one, the skeleton bones in a sense Nov 16, 2021 · Hello , i try to get like this result on threejs without r3f so i follow a tutorial for that , thank’s for @seanwasere but when i add the mouse movement , the meshes move together without physics , is there some tips i have to fallow it ? thank you the result : Threejs Cannonjs Convex Polyhedrons from Collision Mesh (forked) - CodeSandbox. Should I bother using the three. ” In the context of Three. js is a powerful JavaScript library that allows developers to create stunning 3D graphics and interactive experiences directly in the web browser. This is related to “ray casting”, you have a point in space and some direction, that forms a way, and then you want to query your geometry (mesh) to find out which triangles are intersected by the ray, you also find the collision points. When using TransformControls, l found out that you can actually actually translate through other meshes, it just goes through. Essentially, I’m trying to add some rotation to the gltf collider mesh on pointermove and have any balls in the scene respond to that rotation physically, here’s a short clip of what i’m referring to… what I have tried The Cannon physics library is ideal for simulating rigid bodies. js Skeleton class? I’m currently working on collision detection. I use Vertex and Raycaster to detect the collision. CubeGeometry( 64, 64, 64, 8, 8, 8, wireMaterial ) // HOWEVER: when the origin of the ray is Aug 24, 2020 · About collision detection in general. At the moment I’m using the collision detection that comes from ‘Octree. May 22, 2024 · My current approach is to first construct AABB (Axis-Aligned Bounding Boxes) for initial collision detection. We will use it to make objects move and interact in a more realistic way and provide collision detection possibilities. I’ve been working on a small-scale project that displays various cabinet types in a room using R3F (React Three Fiber). 1 model has a lot of vertexes, so with raycast I can’t do it normally. I’m working on a simulation that needs to simulate a spreading mesh in an open space involving objects collisions. You might be able to do some optimizing here if you can make the assumption that all of you’re meshes are going to be more or less consistent along the z-axis. I’m importing simple models from Blender. Learn how to detect intersect and contain collisions using cubes and Jul 13, 2020 · There are two common ways of dealing with character navigation constraints: physics, or a navigation mesh. length = 0; // Clear Mar 13, 2024 · I’m using Perlin noise to create a terrain automatically in three. ^How the OctreeHelper renders. Jun 27, 2024 · Hi there! I made this collision using THREE-MESH-BVH and it works just fine except that when the moveable geometry collides with the idle geometry it gets stuck for just an ms. fromGraphNode()’. How would I go about doing that. You don't have to use it with Three. It’s designed to be memory conscious, fast, and able to be generated asynchronously in a web worker. I was wondering if there is a lilbrary or feature that would add colliders to the rooms so that players cannot go through walls and can go up and down ramps and such. So I’m working with react-three-fiber and use-cannon, and I’m trying to throw basic meshes on a plane. box3() element. In this example, I detect whether the orbit controls will penetrate another object and adjust the cameras position so that it stays outside. intersectsBox( tempBox ), intersectsTriangle: tri => { // check if the triangle is intersecting the capsule and adjust Sep 23, 2014 · Is there a way to implement simple collision detection, preferably using ray casting Here's a pictures of my game. Three. js with this detailed guide. If there is an intersected Jan 4, 2025 · Hello, everyone. However, if there’s already an existing Apr 23, 2024 · Hey @gkjohnson, I’m currently trying to slightly modify your Sphere physics collision Demo but running into some issues that I can’t seem to find documentation on. The randomblock moves down the board and the paddle has to avoid it all my objec Jul 4, 2020 · What is the proper way to implement collision detection in this scenario which allows me to pick a single cube and drag it with mouse, but only within limits set by other cubes (collision with any cube prevent further move in that direction)? I’ve read about position. Enhance your 3D applications through optimized strategies. html file. The body shape exists because I create another mesh with the vertices found in the body to make sure that it is made properly // collision detection: // determines if any of the rays from the cube's origin to each vertex // intersects any face of a mesh in the array of target meshes // for increased collision accuracy, add more vertices to the cube; // for example, new THREE. Some of the gemotery can be a tad too complex for simply creating several box shaped Nov 30, 2020 · Hi there ! First off, I’m a total newbie, so don’t hesitate to tell me if I’m asking in the wrong place or just explaining things wrong. I noticed that when you traverse a gltf mesh( gltf. Thanks for any advice. scene. I then create a physics body with that mesh using Trimesh and get vertices and indices from the geometry. I’m using a separate collision model which has 12294 triangles. Would you also recommend this approach, or do you have another suggestion? The closest example I’ve found so Jan 8, 2024 · Need to ensure that objects do not go through walls/floors and other objects in the scene (collisions). If any Jan 29, 2023 · Hi there, I’m making a simple 3d ‘game’ where you can walk through a building that I made in Blender. In that case you could use something like three-to-cannon or three-to-ammojs to generate a physics collider from your THREE. I made it work just fine but the con of using that InterpolationSamplingMode InterpolationSamplingType InvertStencilOp KHR_mesh_quantization_ExtraAttrTypes KeepStencilOp LessCompare LessDepth Mar 12, 2021 · Hello, I need maximum precision for concave object collision (or is it correct to call this “mesh collision”?) detection and would like to know if there is any way to detect concave (or mesh?) intersections fast enough (if it is even possible for realtime detection)? It is assumed that there will not be many objects and they don’t have many polygons, what can you advice for me? Thanks) Jan 6, 2024 · I’m having issue with cannonjs physics, some dynamic bodies which are created from bounding box of a glb model do not collide with static bodies created using threejs Mesh will collide. Its possible? Nov 26, 2022 · Thanks for your respond, the problem is, it’s more than one rectangle, almost 3-4. After that initial screening, I plan to check for intersecting faces by examining the positions from the geometry of each mesh and the indices that form triangles. However for some reason when I drop a sphere on it then it just falls right through it. Collisions are indicated by "hit" text above the Three. JS and figuring out a way to implement Collision Detection on 3D Models with Raycaster. Octree threejs demo - basic collisions with static triangle mesh MOUSE to look around and to throw balls WASD to move and SPACE to jump May 24, 2021 · Hello, I am trying to do optimized code for 2 detailed models collision detection. A simple example is “throwing a dart at a dartboard. Scan your scene looking for objects that are meant to be static / collidables. traverse((node)) {} ) you actually find that the node has a geometry. glb models. 3 KB) With this images in the same folder as the index. js framework. Mar 17, 2024 · I have this proyect: index. Note that collisions do not register if rays intersect the back side of a mesh (in particular, if the origin of the rays are contained in the target mesh). They display fine, but they seem to make the page crash as soon as they collide with each other. e Box Geometry etc, but when it comes to GLTF loaded objects, collision is not being detected. I finally fixed the issue by slightly pushing the character Jun 2, 2024 · Following up this topic of detecting rain drop collision with a Plane, i have this function bellow, using ray cast to find collision point and reset the rain drop (instanced mesh) whenever it get pass the collision point on the plane: const intersectionPoints = []; // Array to store intersection points for visualization function updateRainPositions() { intersectionPoints. It started off May 13, 2025 · Explore advanced collision detection strategies in Three. js navmesh concept… because it’s first control, it doesn’t make sense somehow, that i calculate raycast between camera position and Aug 8, 2022 · Hello, I am new to this library and generally with three. here is the code snippet, crea… Mar 21, 2024 · Questions collision-detection, vertex hunghaui2310 March 21, 2024, 6:38am 1 Now I’m checking the collision between Mesh. Is there any way I can implement collision detection for Blender imported models where I do not have to create a separate mesh to collide. Sep 15, 2014 · If the distance to an intersection is less than the distance between the Player's position and the geometry's vertex, then the collision occurred on the interior of the player's mesh -- what we would probably call an "actual" collision. Thanks for your time. One of the key features of Three. Apr 23, 2025 · Explore advanced collision detection techniques in Three. When an image is dropped, the corresponding cabinet model should appear in the scene. js with this in-depth guide for developers. geometry. How would I add collision to a object/mesh that was created and imported from blender (gltf)? For example, lets say I build a castle object in blender, and I want to walk around that castle (ramps, stairs and all) via FPS point of view an controls. I was thinking the best way to achieve it will be to have as many particles possible in the scene and then create a geometry by connecting all the vertices. There is a simple example that shows sphere collision which is quite simple of course: Three. Learn techniques to optimize performance and enhance user interaction in 3D environments. js. I started playing around with adding collision to Nov 2, 2023 · I’m currently making a first-person game in three. Jan 31, 2024 · Collision detection is the process of determining when two or more objects intersect in a 3D space. clamp, raycasting and so on, but still has no idea how to put it all together. Essentially, I am creating a ray from the camera target to the camera position. BUT l need functionality for translate/rotate/scaling in my scene. bip26bh conbq92 cdwc qxpxvh k9uc3s 2xsv akajww 1wkjpd1 qipb qfut