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Level of Detail (LOD) for meshes

This page contains information on level of detail (LOD) for meshes. For information on LOD for shaders A programme that runs on the GPU. More info
See in Glossary , meet SubShader LOD value.

Level of item (LOD) is a technique reduces the number of GPU operations that Unity requires to render distant meshes.

When a GameObject The fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObject's functionality is defined by the Components attached to it. More info
See in Glossary in the Scene A Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you lot place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More than info
See in Glossary is far away from the Camera A component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info
See in Glossary , you see less detail compared to when the GameObject is close to the Camera. However, past default, Unity uses the same number of triangles to render information technology at both distances. This can issue in wasted GPU operations, which tin impact functioning in your Scene.

The LOD technique allows Unity to reduce the number of triangles information technology renders for a GameObject based on its distance from the Photographic camera. To employ it, a GameObject must have a number of meshes with decreasing levels of particular in its geometry. These meshes are called LOD levels. The farther a GameObject is from the Photographic camera, the lower-detail LOD level Unity renders. This technique reduces the load on the hardware for these distant GameObjects, and can therefore improve rendering performance.

To sympathize how to employ LOD in Unity, yous must first sympathise what LOD levels are, and how they work.

LOD Levels

A LOD level is a mesh The main graphics archaic of Unity. Meshes make up a large role of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info
Come across in Glossary that defines the level of detail Unity renders for a GameObject's geometry. When a GameObject uses LOD, Unity displays the advisable LOD level for that GameObject based on the GameObject's altitude from the Photographic camera.

Each LOD level exists in a separate GameObject, each of which has a Mesh Renderer A mesh component that takes the geometry from the Mesh Filter and renders it at the position defined by the object's Transform component. More info
Run into in Glossary component that displays that LOD level. For the very everyman level of particular, yous tin can use a Billboard A textured 2nd object that rotates then that it always faces the Camera. More than info
See in Glossary Asset, which Unity displays instead of a 3D mesh. Unity shows and hides these GameObjects every bit required. LOD levels must be kid GameObjects to the GameObject they relate to.

The images beneath demonstrate how the LOD levels change co-ordinate to distance from the Camera.

At LOD 0, the Camera shows a mesh with a large number of pocket-sized triangles. At LOD 1, the Photographic camera shows the mesh with far fewer triangles, which are much larger in size.

Ready LOD in Unity

To use LOD, you must take a GameObject with a LOD GroupingA component to manage level of detail (LOD) for GameObjects. More info
Come across in Glossary component. The LOD Group component provides controls to define how LOD behaves on this GameObject, and references the GameObjects that Unity shows or hides for each LOD level. See LOD Group for details on the backdrop in this component.

You tin set up up LOD in Unity two means:

• You lot tin can configure LOD levels in your external 3D modeling application, and Unity can automatically create and configure the required GameObjects and components for you. Encounter Importing LOD Meshes for details on the correct configuration.
• Yous tin manually create a GameObject with a LOD Group component, and configure the LOD levels manually.

Configuring LOD levels

To manually configure the distance from the photographic camera at which Unity displays each LOD level, use the LOD Grouping component's option bar.

The LOD Group component accepts a maximum of eight LOD levels. LOD 0 is the closest to the Photographic camera, and therefore the near detailed LOD level.

Project-wide LOD settings

In the Quality settings window, y'all tin can configure LOD settings that affect all GameObjects in your Projection.

In that location are ii LOD settings you lot tin can configure:

• Maximum LOD Level: Exclude meshes above a specified LOD level from your build.
• LOD Bias: Determine whether to favor higher or lower LOD levels at threshold distances.

Source: https://docs.unity3d.com/Manual/LevelOfDetail.html

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