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#### 4.9.7.3 Entities

But first lets discuss the type of entities that Crystal Space supports. We already saw sectors above. These are the main containers for all the entities below.

#### Sprites or Models

Crystal Space supports (among others) both 3D and 2D sprites. A 3D sprite is basically a set of triangles or a triangle mesh. I will not go into much more detail here because this document is related to visibility. A 2D sprite is a general polygon which always faces the camera. Both are considered detail objects (more on that later).

#### Things

Things are general objects used to define the basic geometry in a level. They can move and rotate but in general their most important use is to define level geometry (i.e. walls, floor, ceiling, a painting on the wall, a staircase, a chair, etc.). Small and detailed things will be tagged as detail objects.

#### Curved Surfaces

Curved surfaces are implemented in a separate mesh object. They are usually considered as detail objects.

#### Terrain Surfaces

A terrain surface is a large entity that can be in a sector. It is not a detail object (obviously). Handling of terrain and visibility is not ready yet. We need to do more work on this part. At this moment the terrain engine already has a visibility algorithm inside which is used for visibility culling of its own triangles but this algorithm should also be used to cull objects that are on the terrain.

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