Ultimate Fracturing Destruction editor extension for Unity 3D

Is there a way to let it not create any colliders? I just want my object to explode when I trigger it using a script, the debris should just fly through the air and then disappear through the ground. I don't need the overhead of any colliders.

 

Yes, one of the last parameters is Always Gen. Colliders. Just disable it

 

I was wondering if I should enable the Is Trigger property for the kinematic chunks and on impact detach all chunks and disable the trigger attribute. This would avoid hitting against kinematic rigidbodies, the first hit would always be against an already dynamic chunk.

 

Hi there,
I was wondering if there is a way to "batch" the fragment process of multiple and save them as single mesh/prefab.
I know that the saving option is there, but I have A LOT of structures to fragment.
Do you think is possible?

Thanks in advance!

 

The algorithm is creating way too much geometry. The face above could be consisting of 3 triangles, but instead it is using almost 25, while also adding dozens of unnecessary vertices.

 

I'm interested to buy this asset but have a few questions. I'm planning to use this where forces (Rigidbody.AddExplosionForce) are placed on any given object, will your asset detect how much force is placed on the object and fracture?
Also can the fracturing be set so debris falls in diredction of the force, or have like an exploding effect?
Sorry for all the questions, I'd like to try make sure this is the suitable asset for me

 

Hi there!

Not at the moment I'm afraid. This can probably be done by giving support for multiselection.
You plan to have many different objects with different chunks and fragmenting parameters?

 

Hi Glurak,

Check the adjacent faces that are pointing downwards. You need those vertices because the faces below have triangles that link them.
The more depth or chunks you create, the more vertices you end up having.

 

If I can also ask:
Does your system handle dynamic fracturing or would object debris will need to be pre-fractured and have rigidbodies?

 

Those adjacent faces also share the same useless vertices, that's the problem. If I use a 3ds max fracturing script, I end up only with a fraction of that amount of triangles.

Edit:
Nevermind, I'm wrong, it's indeed the fault of my geometry, didn't think it was that weird. Anyway, it would be great to have an option that allows the creation of non-manifold/detached geometry so it renders faster/needs less tris.

 

Hi UGTools,

I have a quick question regarding performance. Right now I'm writing a simple disaster simulation in which a small portion of a city (+/- 100 buildings) can be destroyed as a tornado passes through the scene. I would like to use this asset to make each building destructible however I have some questions concerns. I noticed earlier in this thread that someone asked a similar question and was having significant performance issues (http://forum.unity3d.com/threads/ul...sion-for-unity-3d.184170/page-10#post-2116601).

My scenario differs from the test he talks about in that post in that rather than having one object breaking into 600 chunks, I would have many destructible objects with smaller chunk counts be destroyed between one and three at a time over a longer period. Imagine an explosive force moving through a field of spaced out fractured cubes.

From what I understand the fractured models only become "fractured" once there is a collision event of some sort. Up until that point, the model is rendered using the original mesh. Is this accurate? That means there is no appreciable difference regarding resources and performance until the fracture actually happens?

I know you can't give me specific numbers, but how likely am I to run into performance issues? Can you give me some idea of what I'm looking at here? Ideally I will be targeting a minimum threshold of 60 FPS on reasonable hardware.

Thanks in advance for your time.

 

Exactly, that is one of the optimizations we introduced in earlier versions. Hopefully we will develop some new ones soon!

 

Hi there, this asset pack is pretty much exactly what I'm looking for. I wasn't able to find any video demonstrations showing how this asset pack works with Unity 5. Could you reply back with with something showing your asset pack running in Unity 5? Sorry if I have missed a video you have already put out. Thanks!

 

We haven't uploaded videos with Unity 5 but it works exactly the same but with way better performance.
Unity 5 introduced physx 3.x which has multithreaded support and better/faster physics computations.

 

Hey. I am interested in using this system to reproduce something similar to the effects on house of the dead 2 or left 4 dead 2 where you can fire at a zombie's arm for example and the flesh flies off, and they continue animating. Im trying to deduce whether it can be done with this asset, or whether perhaps it has to be done by cleverly swapping out mesh. Any thoughts or advice on this topic would be greatly appreciated. This, along with the rope asset are extremely well made and worth every penny. Thanks

 

I'm afraid there is no skinned mesh support at the moment

 

Please add an option to disable colliders in detached chunks after n seconds and other to set them to static after n seconds.

 

This seems to be not generating the chunks correctly with Voronoi for objects that have indoors like a building

 

Hello nxtboyIII,

Probably the meshes aren't watertight then

 

What do you mean?

 

There is an error in the console that says "convex hull has a polygon with less than 3 vertices!". How do I fix that?

 

Hi UGT folks!

First: nicely done with F&D. Awesome.
Second: i see it has some difficulties playing nice with VertexColour shaders like the kind used in Low Poly assets like PolyWorld. www.assetstore.unity3d.com/en/#!/content/18572

The single mesh renders fine but the chunks do not.
Is this something that can be fixed?

thx in advance!
Toph

 

Please I have a problem that The tool seems that it does not recognize empty objects, I have used an empty sphere , like an egg (only available the outer part) and when fracturing with voronoi, it will fracture correctly BUT the whole of the sphere, including also the empty space inside.

Also I have used a bottle, and also it does not work as expected, all the bottle is considered as full when is empty

Also I have made this cubic 3D rectangle or Hollow cube (see screenshot), that has the inside empty, and it happens the same, when trying to fracture it, it takes ALL the cube shape including ALSO the empty part. It should only take the visible parts of the mesh and not the whole of the shape.

Please, I am doing something wrong? How can I fracture an empty object?

Thanks for your help

 

This is happening to me too, it is fracturing parts of the mesh that aren't visible

 

Nxtboyll is answering to the the post above I have

Good to know that I am not the only one that happens this, and it happens to you too, and searching on internet, it seems that for this to work it needs to be able to recognize the width of the borders to be able to know where is empty
For example in Blender to use fracture on a hollow shape is needed to solidify the 3D model before fracturing it.

What do you mean that the mesh must be watertight?
I suposse and think it means that it must be 100% closed shape without holes, but:
How can I now if a mesh is really watertight? how can I have a proof of this?

ERRORS AFTER MADE THE FRACTURE

I have a 3D model of a spherical drone that has some additional details and is a closed shape, but when I try to fracture it, it works, but in a weird and strange way.
Using voronoi with values X=3 Y=3 Z=3 you should get 27 fragments, well I get instead 648 fragments!!!! and is really fractured, and the preview chunks works right, BUT in the console appears these errors

Gu::ConvexMesh::loadConvexHull: convex hull init failed! Try to use the PxConvexFlag::eINFLATE_CONVEX flag. (see PxToolkit::createConvexMeshSafe)
UnityEditor.DockArea:OnGUI()

ConvexHullBuilder::CreateTrianglesFromPolygons: convex hull has a polygon with less than 3 vertices!
UnityEditor.DockArea:OnGUI()

In the manual is told that to be able to fix this you should increase the value of Min Collider Volume, well I have done it from value 1 until 900 (also many numbers in between) and still having exactly the same error. Each Time that I have tried a new value I have pressed the Compute colliders.

Also have tried to use a new seed and compute chunks again and keeps being the same

If I buy and use the Concave collider could help to fix this?

GUIDE ABOUT HOW TO PREPARE CORRECTLY 3D MODELS FOR FRACTURING?

Maybe the problem could not be because of the plugin, and could be because the 3D model must be prepared correctly and with some conditions and requirements, so then the plugin can process and fragment the 3D models correctly without problems and errors

So I think it would be good, useful and helpful to have also additionally to the well done manual, a guide about how to prepare a 3d model for fracturing.

Some additional questions related to this topic

Are all the shaders that a mesh could have be allowed to be used for fracturing?

Are all the materials that may be added to the mesh be compatible with fracturing?

What happens with 3D models that may have Quads or N-gons instead of triangles?

Must it have a UV or it does not matter?

From the manual I know that it must be one unique mesh and that it should have some volume, although I really do not know what this means.

Thanks for any possible help

Best wishes

 

Hi there!

Can you send me the model to info@ultimategametools.com? I suspect it could be indeed missing vertex color information

 

Hi SpaceRay,

Yes, if you only have the outer part it will consider it a closed mesh, which makes sense because how would you specify you want the inside fractured as well otherwise?
If you want the hollow part inside, you would need to "close" the mesh so that it has volume, even if it's thin.

Can you send me the cube shape on your screenshot? info@ultimategametools.com

 

Do those 648 fragments also appear if you fracture the mesh deactivating "Generate Mesh Islands" option? This will also create chunks if the algorithm finds groups of closed meshes.

Regarding shaders, materials and some requirements:
-You can use any shader you want, any material you want
-Unity would have to triangulate them for the tool, and I'm not sure if that happends. Do you have any models for testing?
-It doesn't matter if it doesn't have UV

Regarding the "volume" thing. Imagine you have a house and you want to fracture it. You would need the walls to be thick, and not planes. Otherwise the algorithm can't know which parts to fracture. You want the walls to collapse, not the room inside.
You will find many models online that use planes for the walls instead of having proper geometric thickness and that's why they won't work

 

Can you please, please fix this bug? I really need this to work. The building I am trying to fracture is completely watertight and it doesn't work.

 

Hi, I've tried to fracture your model with all default values and this is the result. I don't see anything wrong:

http://postimg.org/image/a4hicn7pp/

 

In that picture you can see right here (http://puu.sh/kf9GB/f22f3840da.png) the collider is making a triangle instead of the corner shape it should be. I don't want that

 

Also I recently bought the Concave Collider asset and when I check the "Concave Collider" checkbox it says Concave Collider is not found. By the way I am on a Mac.

 

That is because the object is dynamic and Unity only allows convex colliders for dynamic objects. Indeed Convex Collider should overcome this issue
Do you have a file located at Assets/Plugins/ConvexColliderDll.dll or Assets/Plugins/x86_64/ConvexDecompositionDll.dll? Even if you are on Mac, it looks for this file to know if it can enable the Concave Collider support.

 

Yes I do have that file.

 

I've spotted a bug that must have slipped in one of the latest versions. Change FracturedObjectEditor.cs line 650:

Code (csharp):

1.  
2. if(System.IO.File.Exists("Assets/Plugins/ConvexDecompositionDll.dll") == false && System.IO.File.Exists("Assets/Plugins/x86_64/ConvexDecompositionDll.dll"))
3.  

for:

Code (csharp):

1.  
2. if(System.IO.File.Exists("Assets/Plugins/ConvexDecompositionDll.dll") == false && System.IO.File.Exists("Assets/Plugins/x86_64/ConvexDecompositionDll.dll") == false)
3.  

 

I've also noticed something. The Concave Collider integration in the fracturing panel doesn't expose all the parameters the Concave Collider allows to tweak when it is added on its own to a GameObject. Using the default parametesr sometimes you can't get the results you're after. I had to tweak them by code to get this:

http://postimg.org/image/hgwxdjdpn/

Which is the correct result, but would require to add new parameters which I will do that in the following days.
Meanwhile if you want to get the same result change FracturedObject.cs line 121: parameter ConcaveColliderMaxHulls should be higher than 1. Try setting it to 6 or 7. But do it before adding the FracturedObject component to the object because it isn't refreshed when you change it once it has been added.

Hope that helps!

 

Hi again!

I will update a fix for this ASAP, but meanwhile you can change MeshData.cs line 217:

Code (csharp):

1.  
2. resultArray[i].bHasColor32 = false;
3.  

for:

Code (csharp):

1.  
2. else resultArray[i].bHasColor32 = false;
3.  

 

Ok thanks. Also for some reason the Fracturing and Destruction asset causes unity to crash a lot, and whenever I compute the concave colliders it always, always crashes.

 

I think I found a bug in how supported chunks are being calculated. When destroying a simple cube I get the result shown in the attached photos. Wherein, the chunks at the top of the cube will continue to float. Is there any setting I can check that will fix this? I read through the documentation but didn't see any thing about how it was determined if the chunk was still supported.

 

Hi nxtboylll,

I'm looking into it right now. It is very difficult to debug but I will make an update soon hopefully.

 

Hi mercalli,

Can you send me a sample scene to info@ultimategametools.com? Thanks!

 

Well, after trying to create a sample scene for you, I figured it out In my custom explode script I wasn't setting the bCheckStructureIntegrityAfter parameter to true. As soon as I set it to true the parts no longer float, and it falls as expected.. Awesome.

 

Nice! hope it looks cool

 

Hi there,

I was wondering if there's a way to disable fracturing when a large piece is detached from the main object.

For example on this screenshot, if I press Space the gun will fire and the part in the green area will be detached and fractured into multiple chunks. I'd like to disable the fracture, at least until it reaches the floor. Is it possible ?

 

This was done by an user. And requested long time ago. This asset has not been improved in a long time either. Just updated to u5.

 

Hi allinlabs,

Indeed this feature has been really high priority for some time. We have been extremely busy lately developing our 3 new assets but now that they are online we are concentrating our effort in F&D updates. As soon as I have some more concise dates and info I'll let you know.

 

Bigger updates with brand new features are in the making

 

Seriously looking forward to these. You expect to keep suppport for 4.6.8 platform?

 

An idea for future.
For large stuff I wouldn´t mind to slice my geometry in 3dmax for later on independently fracturing each part, so when a projectile hits the building, it doesn´t spawn several zillions of rigidbodies but just those on the area on impact. This can be done actually, the issue is that betwen each other there is no structural relationship.I'm pretty sure that is not too hard to add considering the actual structural capabilities. It would instead need to consider each fractured object group the way actually chunks are considered. In case of collapse you could collapse a building considering as a chunk the different groups root geometries without spawning rigidbodies at will. Or even further, If baked to anim, these parent geometries still not fractured, could collapse without using physycs and without trigering the fracture of the objects below its node. Sounds to me like the only way to go massive with destruction.

Edit: You could even use the fracturing solution for the first step without adding rigid bodies etc.

Edit 2: please allow planar surfaces.

 

Sorry for a noob question, but can I synchronize destruction of objects through Unity Network (uNet)? If on authoritative server the object or part of it is destroyed - all players see it the same way? Maybe not exactly the same but more or less