In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. Think of each unique Scene file as a unique level. However, a good rule is to use mesh colliders for scene A Scene contains the environments and menus of your game. The benefit of this is that a convex mesh collider can collide with other mesh colliders so you can use this feature when you have a moving character with a suitable shape.
This generates the collider shape as a “convex hull” which is like the original mesh but with any undercuts filled in. You can get around this in some cases by marking the mesh collider as Convex in the Inspector A Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. Also, a mesh collider cannot collide with another mesh collider (i.e., nothing happens when they make contact). These colliders are much more processor-intensive than primitive types, so use them sparingly to maintain good performance. More info See in Glossary graphic perfectly but you can refine the shape to any level of detail The Level Of Detail (LOD) technique is an optimization that reduces the number of triangles that Unity has to render for a GameObject when its distance from the Camera increases. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. In 2D, the Polygon Collider 2D does not match the shape of the sprite A 2D graphic objects. More info See in Glossary to match the shape of the GameObject’s mesh exactly. In 3D, you can use Mesh Colliders A free-form collider component which accepts a mesh reference to define its collision surface shape. There are some cases, however, where even compound colliders are not accurate enough. If you use a combination of rotations and non-uniform scales in the Transform hierarchy so that the resulting shape is no longer a primitive shape, the primitive collider cannot represent it correctly. Primitive colliders do not work correctly with shear transforms. More info See in Glossary component, placed on the root GameObject in the hierarchy. When you create a compound collider like this, you should only use one Rigidbody A component that allows a GameObject to be affected by simulated gravity and other forces. For instance, you can rotate boxes relative to the local axes of the parent GameObject.
To get further flexibility, you can add additional colliders on child GameObjects. You can add any number of these to a single GameObject to create compound colliders.Ĭompound colliders approximate the shape of a GameObject while keeping a low processor overhead. In 2D, you can use the Box Collider 2D and Circle Collider 2D. More info See in Glossary and Capsule Collider A capsule-shaped collider component that handles collisions for GameObjects like barrels and character limbs. More info See in Glossary, Sphere Collider A sphere-shaped collider component that handles collisions for GameObjects like balls or other things that can be roughly approximated as a sphere for the purposes of physics. In 3D, these are the Box Collider A cube-shaped collider component that handles collisions for GameObjects like dice and ice cubes. The simplest (and least processor-intensive) colliders are primitive collider types. A rough approximation of the mesh is often more efficient and indistinguishable in gameplay. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. Unity supports triangulated or Quadrangulated polygon meshes. Meshes make up a large part of your 3D worlds. A collider, which is invisible, does not need to be the exact same shape as the GameObject’s mesh The main graphics primitive of Unity. More info See in Glossary for the purposes of physical collisions. A GameObject’s functionality is defined by the Components attached to it. Collider components define the shape of a GameObject The fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more.
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