《切水果》那游戏还算是个伪3D吧。估计是考虑了表现能力和资源。
下面是个U3D的插件，可以实现随意切的效果。
http://gustavolsson.squarespace.com/shatter-toolkit/
发现还有一个浮力的插件。。
http://gustavolsson.squarespace.com/buoyancy-toolkit/
原文的ReadMe：
Attach one ShatterTool script instance and one UvMapper script instance (WorldUvMapper or TargetUvMapper), located in Core/Main/, to a game object that you want to shatter or split. When shattering or splitting a game object the pieces will be instantiated as clones of the original game object and the original game object will be destroyed.
The ShatterTool script requires that the game object has a MeshFilter attached, as it needs some geometry to work with. Any other component you attach will be carried over without modification to the pieces when the game object is shattered or split. However, the ShatterTool script takes special care to itself, MeshCollider and Rigidbody components respectively. If attached, any of these will be updated to act realistically when the game object is shattered or split by for example modifying the Rigidbody's mass and velocity.
IMPORTANT! If you attach a MeshCollider and a Rigidbody, always keep the MeshCollider Convex in order to avoid errors while updating the mass properties of the Rigidbody.
IMPORTANT! If ShatterTool.FillCut is enabled (default) every edge of the mesh needs to belong to exactly two triangles, ie. the mesh needs to be closed.
Here are a number of ways you can shatter or split a game object:
No scripting required:
- Attach the ShatterOnCollision script (located in Helpers/Game Objects) and specify the required force needed to shatter the game object (requires an attached rigidbody and convex collider)
- Attach any of the mouse scripts (located in Helpers/Mouse) to an empty game object in the same scene
Scripting:
- In a script, send a "Shatter" message to the game object and specify a world-space point (Vector3) where the game object should be shattered; for example
SendMessage("Shatter", Vector3.zero);
- In a script, send a "Split" message to the game object and specify an array of world-space planes (Plane[]) with unit-length normals where the game object should be split; for example
SendMessage("Split", new Plane[] { new Plane(Vector3.right, Vector3.zero) });
# Example scenes:
Check out the example scenes to see how the shatter toolkit is used in practice.
# Good to know
1. The ShatterTool properties have tooltips in the editor, mouse over to read them
2. Check out the Reference.zip for scripting reference
3. You can make the ShatterTool instance send pre- and post-split messages by toggling the "Pre Split msg" and the "Post Split msg" properties in the editor. These may be useful if you need to do something before and/or after a split occurs.
4. When shattering or splitting parented game objects, make sure you always handle the children/parent carefully to avoid duplicating too many game objects. See the Table game object in the Basic scene for an example.
翻译一下它的ReadMe文件吧：
1.使用方式：
注意：
1.模型的三角面不能多于255个，这个是physx的convex的限制。
2.尽量不用他的PreSplit和PostSplit，它要用到SendMessage，似乎会比较慢。
3.不要把生成的新物体赋给一个父物体，会减慢速度。