Unity mesh collider trigger

The screenshots have been captured from version 4. As new releases are distributed, menus, names or layout in the editor may differ. When creating a new game object in the Unity editor, we can add new components either in the top menu or in the Inspector, after selecting the related object. Colliders are located under the Physics tab. The Box Collider defines a cube area where collisions will be detected. The Sphere Collider is similar, but using a spheric volume instead.

Finally, the Capsule collider defines a Capsule volume for collision detection. All Colliders have a Material field. It refers to the Physics material which determines how the collider will react to collisions, in regard to friction and bounciness. You can also define multiple colliders for a single object to define complex collision areas. To do so, you need to create empty child objects of your game object, and define colliders for each child.

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Mesh Colliders are a particular type of collider which uses an actual mesh for collision detection. They are quite expensive as they compute collision against every face of the mesh, so depending on the complexity of your meshes they can add up quickly.

For this reason, you should avoid using Mesh colliders if possible. Normally, collisions between two mesh colliders are ignored. If you want to detect collisions between mesh colliders, you need to set them as Convex in the Inspector. A game object with a rigid body will be influenced by gravity and external forces. Continuous collision detection is used when dealing with fast moving objects.

Box Trigger and Mesh Collider on one object.

When using Discrete collision detection, some collisions may not be detected as they may go through the other object collider between the time another check is performed. By default, this is set to Discrete and you should leave it as continuous collision detection may really slow down your game.

Every MonoBehaviour attached to the game object will listen for collision with other game objects in the world. The engine offers multiple methods, depending on the collision stage and type of collision. OnCollisionEnter is called when the game object collider starts touching another game object with a collider and rigidbody attached.

While colliding, OnCollisionStay will be called once per frame. Finally, when the collision stops, OnCollisionExit will be called.

Mesh Collider

As you can see, each of these methods supply a Collision object, which contains info about the contact points, the object it collided with, their relative velocity etc. We use it to print to the terminal information about the collision between the two game objects. They work roughly the same way, but supply the Collider object directly instead of giving a Collision object:. Just remember that, for trigger collision event to be triggered, one of the two colliders needs to have a rigid body attached.

You can force the collision system to ignore certain type of collisions, either specifying the actual objects collider or using layers. Just note that both objects need to be active for it to work.

unity mesh collider trigger

On the other hand, IgnoreLayerCollision lets you specify two layers using their IDs as integers and will tell the collision system to ignore collisions between objects of layer1 and layer2. If you need to check if collision between two layers are ignored, you can use GetIgnoreLayerCollision:.The Mesh Collider takes a Mesh Asset and builds its Collider An invisible shape that is used to handle physical collisions for an object.

More info See in Glossary based on that Mesh. It is more accurate for collision detection An automatic process performed by Unity which determines whether a moving GameObject with a rigidbody and collider component has come into contact with any other colliders. More info See in Glossary than using primitives for complicated Meshes. Mesh Colliders that are marked as Convex can collide with other Mesh Colliders.

The Mesh Collider builds its collision representation from the Mesh attached to the GameObject The fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more.

More info See in Glossaryand reads the properties of the attached Transform to set its position and scale correctly. The benefit of this is that you can make the shape of the Collider exactly the same as the shape of the visible Mesh for the GameObject, which creates more precise and authentic collisions.

However, this precision comes with a higher processing overhead than collisions involving primitive colliders such as Sphere, Box, and Capsuleso it is best to use Mesh Colliders sparingly. Faces in collision meshes are one-sided. This means GameObjects can pass through them from one direction, but collide with them from the other. Details about underlying algorithms and data structures used by mesh colliders can be found at PhysX documentation.

Mesh cooking changes a normal Mesh into a Mesh that you can use in the physics engine. Cooking builds the spatial search structures for the physics queries, such as Physics.

Raycastas well as supporting structures for the contacts generation. Unity cooks all Meshes before using them in collision detection. The downside is that you need to generate no degenerate triangles and no co-located vertices, but the cooking works faster.

Note : When you set the Cooking Options to any other value than the default settings, it means the Mesh Collider must use a Mesh that has an isReadable value of true. GameObjects that have a Rigidbody A component that allows a GameObject to be affected by simulated gravity and other forces. More info See in Glossary component only support Mesh Colliders that have Convex option enabled: the physics engine can only simulate convex mesh colliders.

You should not modify mesh geometry that is used for colliders because the physics engine has to rebuild an internal mesh collision acceleration structure every time you change the mesh. This causes a substantial performance overhead.Many games simulate real-world physics and collisions are also a crucial part of these simulations.

Likewise, while we develop games, most of the time we start or stop events based on other events.

Unity 3D: Collisions Basics

In Unity, colliders are components that allow the physics engine to handle the collisions. The physics engine simulates collisions using colliders. We can determine which objects will collide with each other, or how objects will behave under collisions using colliders. On the other hand, triggers are special setups of colliders. The purpose of triggers is to trigger events when more than one objects overlap. If an object has a collider that is configured as a trigger, that object does not collide with any other object but overlap instead.

There are several collider types in Unity3D. There are also 2D versions of these colliders. Mesh Collider creates a collider that exactly covers complex meshes. However, physics calculations for mesh colliders are expensive and if possible, you should avoid using them. Most of the time developers add few primitive colliders in order to cover the object.

unity mesh collider trigger

Generally, it is sufficient to cover most parts of the object. Primitive objects come with colliders attached.

If you import a custom mesh into your scene, you need to add a collider component for that object. Box Collider is one of the most used colliders. By using its properties, you can determine if this collider is a trigger or not do not worry about triggers yet, we will see it in detail later or its center and size.

In addition, you can attach a physics material that specifies the friction coefficient and bounciness we will see physics materials in a minute. You can control all these properties in the inspector as well as in C script. Here are some code samples that control these properties:. The second collider that we will see is the sphere collider. You can control its IsTrigger, material, the position of center and radius properties.


You can also access these properties using C scripts. Here are some code samples:. Another important collider is the capsule collider. Like box collider and sphere collider, you can control properties like center, radius, and height.

You can assign a physics material, and also change the direction. Direction property changes the orientation of the collider. Developers generally use capsule colliders for characters. The following code samples control some properties of a capsule collider:. Mesh collider is a type of collider that has the same geometry with the mesh that is associated.Discussion in ' Scripting ' started by RecluseFeb 23, Search Unity. Log in Create a Unity ID. Unity Forum. Forums Quick Links.

Asset Store Spring Sale has begun! Unite Now has started! Come level up your Unity skills and knowledge. Come post your questions! Joined: May 16, Posts: I've been using Unity for over a year and a half and suddenly I'm having a really basic problem! I've got two different objects, both with convex mesh colliders. Neither will collide. I've checked the collision Matrix in the physics settings. I've tried adding a rigidbody to both of them, marked it as Kinematic, but this doesn't work. The only way I can get the objects to collide is to add a non-kinematic rigidbody to one.

But this is then affected by Physics, which I don't want. Is there no way to get two convex mesh colliders to register contact? RecluseFeb 23, Joined: Nov 12, Posts: Did you check your collider meshes don't have more than triangles? It they do then no convex collision….A primitive Collider shaped like a cuboid. Material - A reference, if specified, to the physics material of the Box Collider. A primitive Collider shaped like a sphere. Material - A reference, if specified, to the physics material of the Sphere Collider.

Two half spheres joined by a cylinder. Material - A reference, if specified, to the physics material of the Capsule Collider. Damper - A larger value dampens the velocity more and the suspension moves slower. Target position - the default is 0. A Collider based on a Mesh Asset. Convex - Convex Mesh colliders are limited to polygons - if enabled, this Collider can collide with other mesh colliders.

Example Box Collider A primitive Collider shaped like a cuboid. Properties Is Trigger - If ticked, the Box Collider will ignore physics and become a Trigger Collider Material - A reference, if specified, to the physics material of the Box Collider Mesh - A reference to the mesh the Collider is based on Convex - Convex Mesh colliders are limited to polygons - if enabled, this Collider can collide with other mesh colliders Example If you apply more than one Collider to a GameObject, we call it a Compound Collider.

PDF - Download unity3d for free. Previous Next. Related Tags. This website is not affiliated with Stack Overflow.I'm creating a vanishing platform and I have my code working, but to be honest, I'm not sure how I'm getting the result I'm getting based off the code I wrote. To elaborate, I have attached a scaled box trigger on to an object that has a mesh collider. Now, when the player walks into the box trigger, the platform renderer will disappear after a set amount of seconds. The platform will also set the mesh collider as a trigger so that the physics are pretty much gone, thus, allowing the player to fall.

After another set amount of seconds, the platform will come back and the mesh collider's trigger value will be set to false. This is the part that confuses me but I'm glad it's workingthe box trigger is completely unaffected every time. Seeing how the box trigger is technically a collider as far as I thought, I would think that setting the "unspecified" collider's trigger to false would disable both the mesh collider's AND box trigger's trigger to false.

Anyone know why this may be happening, and just to be safe, does anyone know a way to specify which collider to manipulate in code? I suppose the collider property works like audio or other GameObject properties: they only return the first component GetComponents is used in order to access the others.

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Unfortunately, Unity tells nothing about the component order, thus it's possible although not likely that in the future something gets changed and your script stop working. If you want to avoid this risk, child the trigger volume to the platform instead of adding it, and move the code above to the trigger - with some modifications, of course:.

Thanks for the advice.

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Your method of child triggering was the way I was actually doing it before. I suppose I wanted to be lazy this time around, but I'll probably revert to the method you spoke of. Attachments: Up to 2 attachments including images can be used with a maximum of To help users navigate the site we have posted a site navigation guide. Make sure to check out our Knowledge Base for commonly asked Unity questions.

Answers Answers and Comments. A question about collisions. Multiple Colliders Trigger problem 2 Answers. Can't click gameobject when over another trigger? Box colliders from procedural mesh 1 Answer. Login Create account. Ask a question. Hello, I'm creating a vanishing platform and I have my code working, but to be honest, I'm not sure how I'm getting the result I'm getting based off the code I wrote.

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Unity 5 does not support that because the updated PhysX does not allow it. A mesh collider can collide with a primitive collider box, sphere, capsule but there is no way to have two mesh colliders register a trigger or collision. You'll need to use compound colliders to approximate the shape.

IMO although it seems imprecise at first in practice you hardly notice if your collision area is slightly outside of your mesh. Performance wise multiple primitives on anything other than mobile at least are next to nothing so don't be afraid to use as many colliders as you need to approximate your shape.

Learn more. Asked 3 years, 2 months ago. Active 3 years, 2 months ago. Viewed 4k times. I'm having some troubles checking the "Is Trigger" option on a non-convex mesh collider. I looked for an answer on the internet and found something like : Unity 5 does not support that because the updated PhysX does not allow it. Since the post is kind of outdated? I hope you'll be able to help me :P Thank you in advance, Axel. Axel Samyn Axel Samyn 83 2 2 silver badges 7 7 bronze badges.

I only heard about hacky workarounds : What kind of mesh is this?

Unity: Good Enough for Bad Games

Does it really need a mesh collider? Well imagine a temple run like game with tetris blocks as obstacles Active Oldest Votes. Absinthe Absinthe 2, 2 2 gold badges 18 18 silver badges 45 45 bronze badges. Guess I'll have to do that ; But what's sad is that it seems like it was possible in the earlier versions of Unity Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

unity mesh collider trigger

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