Make sure its activated ( click the checkbox to the left of the heading). A set of properties will appear in the ' Inspector' headed ' Mesh Collider' ().

In the ' Inspector' click the ' Add Component' button () bottom of the panel and select ' Physics' then ' Mesh Collider'. Once the model is available drop an instance into the Editor (main viewport) and in the ' Hierarchy' select the mesh corresponding to the collision hull () and left-click select it. In Unity import the mesh as a typical asset WITHOUT setting Unity to auto generate collision data. In the ' File Browser' that appears select the options to the lower-left - typically only ' Selected Objects' is necessary when working with a lot of content in the same file (else everything is exported) - and then click ' Export FBX' top-right. For accuracy both collision and visible game-mesh should similarly position in 3D space, and use the same Origin point (shown below separated for clarity).Įxporting collision with game-mesh in BlenderĮxporting a game-mesh with collision included is relatively straightforward, simply ' Shift+RMB' multi-select each mesh to be exported as normal and from the ' File' menu select ' Export Â» FBX (.fbx)'. Generally speaking the collision mesh will be constructed from 'primitive' shapes, usually cubes and other solid volume shapes in differing configuration, be 'closed' or 'sealed' (must not have any open faces or gaps), and be convex. The collision mesh is basically a simplified version of the 'game object', the item visible to the player in-game. For learn more about collision read ' Collision meshes & game models'. To alleviate this, rather than using the editors inbuilt systems, collision can be included alongside models when they are exported from Blender (Max, Maya or other 3D software).

Export game-mesh with custom collision for UnityĪlthough Unity has a number of way to add collision to an environment using Unity Editor, placing hundreds or thousands of such objects can be tedious and time-consuming for large levels, or projects with a lot of model assets in use.

Unity export mesh to fbx