Unity uses the meshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info
See in Glossary’s bounds to determine whether to render it. If the entire bounding volumeA closed shape representing the edges and faces of a collider or trigger.
See in Glossary is outside the view of any active CameraA 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, Unity does not render the mesh.
In the case of a Skinned Mesh RendererA 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
See in Glossary, its mesh bounds change as it deforms. Unity accounts for all animations present at import time when it calculates the maximum bounding volume, and uses this value to determine visibility; however, the following situations that occur after import might push vertices or bones outside of the maximum known bounds:
If this happens, Unity might not correctly determine the visibility of the mesh, and might fail to show it when expected.
In these cases, you can try either of the following solutions to fix the problem:
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