Will freezed body be raycasted?

[Rodion Karimov]

Hello. I need an object, that will not interact physically with other objects, but will be raycasted by function NewtonWorldRayCast.

So if I create body with some collision primitive than freeze it by NewtonWorldFreezeBody - will it be then raycasted by NewtonWorldRayCast?

I use Newton 1.53.

[Julio Jerez]

yes.
but you should use 2.00

[Rodion Karimov]

But will it work in 1.53?
2.x I will use in my next games. I familiar with 1.53, so I'll use it in current - for not to search information about the changes in 2.x now.

[Julio Jerez]

yes.

[Rodion Karimov]

Ok, thank you.

One note - I downloaded Newton SDK 2.23 and there is no any documentation - even simple list of functions, as in 1.53. I think at least this list will be very helpful. Wiki is good, but it is online and if there is need to quickly learn information about some function - it is not very convenient to connect to internet, navigate wiki and search information about function.

But anyway - thanks for good physics engine.

And I found some bugs on site - in download section - dates of two new releases are - 07/05/2210 and 08/01/2210. The year is 200 years ahead .

[Stucuk]

The Wiki is the documentation. There is no Offline Documentation as it would easily become outdated. The Wiki on the other hand can be updated by the community as Newton Develops. Can't you just stay connected to the Internet(My Router is generally connected 24/7)?

[Rodion Karimov]

It is just a suggestion. But if it is not convenient to NGD developers - OK, I'll not argue.

[Rodion Karimov]

Strangely - frozen bodies are still interacting.

I create them so -

Code: Select all

WriteOffsetMatrix ( OffsetMatrix, GameEngine.OWithFT [ i ].Size.y );

      case GameEngine.OWithFT [ i ].DescriptionType of
        PE_DT_SPHERE : Collision        := NewtonCreateSphere ( NewtonWorld, GameEngine.OWithFT [ i ].Size.x, GameEngine.OWithFT [ i ].Size.y, GameEngine.OWithFT [ i ].Size.z, @ OffsetMatrix );
        PE_DT_CYLINDER : Collision      := NewtonCreateCylinder ( NewtonWorld, GameEngine.OWithFT [ i ].Size.x, GameEngine.OWithFT [ i ].Size.y, @ OffsetMatrix );
        PE_DT_BOX : Collision           := NewtonCreateBox ( NewtonWorld, GameEngine.OWithFT [ i ].Size.x, GameEngine.OWithFT [ i ].Size.y, GameEngine.OWithFT [ i ].Size.z, @ OffsetMatrix );

      end; //-case

      GameEngine.OWithFT [ i ].NewtonBody   := NewtonCreateBody ( NewtonWorld, Collision );
      NewtonReleaseCollision ( NewtonWorld, Collision );

      //if GameEngine.OWithFT [ i ].Flags and OF_NOT_INTERACTING > 0 then begin
        NewtonBodySetAutoFreeze ( GameEngine.OWithFT [ i ].NewtonBody, 0 );
        NewtonWorldFreezeBody ( NewtonWorld, GameEngine.OWithFT [ i ].NewtonBody );

      //end;

      NewtonBodySetMassMatrix ( GameEngine.OWithFT [ i ].NewtonBody, GameEngine.OWithFT [ i ].Mass,
                                0.2 * GameEngine.OWithFT [ i ].Mass * ( GameEngine.OWithFT [ i ].Size.y * GameEngine.OWithFT [ i ].Size.y + GameEngine.OWithFT [ i ].Size.x * GameEngine.OWithFT [ i ].Size.x ),
                                0.2 * GameEngine.OWithFT [ i ].Mass * ( GameEngine.OWithFT [ i ].Size.z * GameEngine.OWithFT [ i ].Size.z + GameEngine.OWithFT [ i ].Size.x * GameEngine.OWithFT [ i ].Size.x ),
                                0.2 * GameEngine.OWithFT [ i ].Mass * ( GameEngine.OWithFT [ i ].Size.z * GameEngine.OWithFT [ i ].Size.z + GameEngine.OWithFT [ i ].Size.y * GameEngine.OWithFT [ i ].Size.y ) );

      if GameEngine.OWithFT [ i ].Mass <> 0.0 then
        NewtonBodySetForceAndTorqueCallBack ( GameEngine.OWithFT [ i ].NewtonBody, ForceAndTorqueCallBack );



    NewtonBodyGetMatrix ( GameEngine.OWithFT [ i ].NewtonBody, @ GameEngine.OWithFT [ i ].Matrix );
    WriteRotYMatrix ( GameEngine.OWithFT [ i ].Matrix, GameEngine.OWithFT [ i ].Rotation.y );
    WriteCoordinatesInPhysicsMatrix ( GameEngine.OWithFT [ i ].Matrix, GameEngine.OWithFT [ i ].Coordinates );
    NewtonBodySetMatrix ( GameEngine.OWithFT [ i ].NewtonBody, @ GameEngine.OWithFT [ i ].Matrix );
   
    SelectionEngine.SelectionDataArray [ j ].SType               := ST_OBJECT;
    SelectionEngine.SelectionDataArray [ j ].O                   := @ GameEngine.OWithFT [ i ];
    NewtonBodySetUserData ( GameEngine.OWithFT [ i ].NewtonBody, @ SelectionEngine.SelectionDataArray [ j ] );
    j                                   := j + 1;

They are raycasted, but they still interact with player, created like in Character Controller example. Maybe I'm making something wrong? Any suggestions will be very appreciated. I use Delphi headers with Free Pascal if it matters.

[Rodion Karimov]

I've found some solution - I've set for these bodies - non collidable material. And everything works. Maybe it is not the best solution, but it works.

[JernejL]

Ofcourse a frozen body will be raycast and will interact if something hits it. It's common functionality. Freezing a body does not equal to removing it from the newton world..

[Rodion Karimov]

Strange behavior - logically

NewtonBodySetAutoFreeze ( GameEngine.OWithFT [ i ].NewtonBody, 0 );

must disable autoactivation of the body. And

NewtonWorldFreezeBody ( NewtonWorld, GameEngine.OWithFT [ i ].NewtonBody );

must deactivate it. But anyway - solution is found and it works. And it is good.