Merge pull request #122 from MineBill/collision-data

Add some information about convex and triangle mesh collision data.

manual/physics/colliders/collision-data.md

@@ -25,6 +25,23 @@ Now open the asset (double-click on it) and assign the model to use for a collid
 | **Convex Flags** | The convex mesh generation flags. See [ConvexMeshGenerationFlags](https://docs.flaxengine.com/api/FlaxEngine.ConvexMeshGenerationFlags.html) to learn more. |
 | **Vertex Limit** | The convex mesh vertex limit. Use values in range [8;255]. |
 
+### Collision data type
+Flax allows you to generate a convex or a triangle mesh for your collision data.
+
+#### Convex
+A convex mesh is a simplified representation of a 3D object in which all internal angles are less than 180 degrees. This simplification results in a mesh with a uniform shape, and it's particularly well-suited for certain collision scenarios.
+
+![Convex](media/convex.png)
+
+#### Triangle mesh
+A triangle mesh is a more detailed representation of a 3D object, consisting of interconnected triangles. This mesh type is capable of accurately representing complex and concave shapes, making it valuable for accurate collisions.
+
+![Convex](media/triangle-mesh.png)
+
+As you can see, a triangle mesh offers much more granularity and better represents the mesh but it comes at a cost:
+- More expensive both in terms of memory and calculations.
+- **Cannot** be used with a Rigidbody. This means they can only be used to collide against them.
+
 ## Create collision data from code
 
 Flax supports creating most of the asset types in Editor using C# scripts (with editor plugins). The same applies to the collision data asset. Here is an example code that bakes the asset: