DIF Files Cause PhysX Collision Logic to Crash - LOGGED

#1 I'm not certain, but I don't believe DIFs support PhysX. I'll have to check on that.

You can export your DIFs to DAE from within the world editor though. That feature is available via File->Export Interiors to Collada. It'll bring up a window with the DIFs that loaded and you can select which ones to export.

#2 I created a collada model to replace the interior instance (.dif file), but now all my objects are kind of shaking inside the simulation (jittery).

What are the different types of interior instances you can have?

#3 Is there a way to tweak your collision forces? Or give a "cushion" of some sort? Usually there is an epsilon value used to prevent jitter in close contact physics sims....

#4 I do have objects that are within close proximity of each other and I don't have the jittery objects.

It happens when I use a collada building model instead of a DIF building model.

All the objects inside the collada building model jitter, but when I load the level without the collada building model, then the jittering stops.

It's not just physics objects that jitter, but all types of objects.

#5 Greetings!

Logged as THREED-1453. Thanks!

- Dave

#6 the reason they jitter is cause if the collada building is a physics object, the other physics objects are within its physics collision bounds, if you understand, a physics object inside a physics object will try to displace its-self to outside the object, thats physics.

these are my unsupported observations while doing similar structures.

you will need a lot of planning when doing buildings to support these kinds of things.

#7 I created the office building as a TSStatic object using a Collada model.

It turns out that the jittery effect I'm seeing is my player model. If I click F8 to go into camera mode, then click F7 to go back to player mode, then the jittery goes away.

It seems like when I first load the mission, the player is placed a little below the floor of the building model, just slightly, but that seems to be causing the jittery effect.

#8 @Philip

I'm looking at this bug now.

Can you please email me the old DIF that was causing the PhysX issue at tom@sickheadgames.com. I don't need anything other than the one .DIF file... no materials or textures.

#9 @Tom

I just sent you the email with the .DIF file attached. Thanks.

#10 Fixed for 1.1.

In engine/source/interior/interiorInstance.cpp around line 248:

if ( PHYSICSMGR && mInteriorRes && mInteriorRes->getNumDetailLevels() > 0 ) // MODIFIED!
   {
      // TODO: We need to cache the collision by resource name
      // and reuse it across multiple instances.

      // Get the interior collision geometry.
      ConcretePolyList polylist;
      mInteriorRes->getDetailLevel(0)->buildPolyList( &polylist, 
         Box3F(999999.0f), MatrixF::Identity, getScale() ); // MODIFIED!
      polylist.triangulate();

      if ( !polylist.isEmpty() ) // ADDED!
      {
         // Use a triangle mesh for collision.
         PhysicsCollision *colShape = PHYSICSMGR->createCollision();
         colShape->addTriangleMesh( polylist.mVertexList.address(), 
                                    polylist.mVertexList.size(),
                                    polylist.mIndexList.address(),
                                    polylist.mIndexList.size() / 3,
                                    MatrixF::Identity );

         PhysicsWorld *world = PHYSICSMGR->getWorld( isServerObject() ? "server" : "client" );
         mPhysicsRep = PHYSICSMGR->createBody();
         mPhysicsRep->init( colShape, 0, 0, this, world );
         mPhysicsRep->setTransform( getTransform() );
      } // ADDED!
   }

That should do it. Thanks for the report Philip!

#11 Thanks a lot Tom! I appreciate it:)