Question about joints

[Ywa]

Hello. I've been trying to understand how joints work in the engine, so I set myself a simple example:

 

var
 Phys,Mesh, Phys2, Mesh2 : TEntity;

//////////TEST///////////
 Phys := CreateBodyBox( 1,1,1 );
 Mesh := CreateCube( Phys );
 EntityType( Phys, 1 );

 PositionEntity( Phys, mCar.GetPos + Vec3( 0,2,0 ), 1 ); //mCar is another entity

 Phys2 := CreateBodyBox( 1,1,1 );
 Mesh2 := CreateCube( Phys2 );
 EntityType( Phys2, 1 );

 PositionEntity( Phys2, mCar.GetPos + Vec3( 0,0.5,0 ), 1 );
 SetBodyMass( Phys2, 1 );

 CreateJointHinge( Phys, Phys2, mCar.GetPos + Vec3( 0,1,0 ), Vec3(1,0,0) );

 

Basically, I want to see how it works (just like in the wiki example), however when I run the above code, the second box (phys2/mesh2) falls to the ground, without hinge-ing or whatever. I even tried parenting before, but it makes it worse. What am I doing wrong? Thanks.

[Ywa]

Bump.

[Wchris]

Bump.

i don't know, but i'll try your code, looks funny to play with joints

[Wchris]

Bump.

Boing !

 

what is mCar.GetPos supposed to return ? a Tvec3 ?

and delphi does not complain when you use the + operator on two Tvec3 ?

If you have overloaded the Tvec3 add operator, then maybe the problem is there ?

 

This is what i get

[Ywa]

mCar.GetPos returns a TVec3, yes. I also have an overloaded add operator (..but I haven't got problems using it). Anyways, I'll try your code and post results.

 

Results:

 

 

EDIT: I have no idea what's wrong. Also, there's some clipped code (on the CreateJointHinge line, can you write it, please). Thanks.

[Wchris]

EDIT: I have no idea what's wrong. Also, there's some clipped code (on the CreateJointHinge line, can you write it, please). Thanks.

Don't worry we will find out what's wrong. I'm currently at work, i'll come back this evening.

 

Hey ! an overloaded add operator for Tvec3 is a good idea ! Why did i not have this one ? Will do this too !

 

EDIT :

Your screenshot tells me your engine is not up to date, all those red lines in physics debugging mode is a bug that activates debugging on terrain. You'll need latest cray supercomputer to get decent fps when debugging physics with this version .

 

please rerun LESDK updater for 2.40 and try again.

[Ywa]

From my game engine log, it seems I already have LE 2.40.

 

Leadwerks Engine 2.40
Initializing Renderer...

 

PS: Seems like my engine.dll wasn't updated. Results:

 

- Aside from the fact that the terrain physics aren't debugged anymore (which is a good thing), my problem is still there. Waiting for your reply, thanks

[Wchris]

From my game engine log, it seems I already have LE 2.40.

 

Leadwerks Engine 2.40
Initializing Renderer...

 

PS: Seems like my engine.dll wasn't updated. Results:

 

- Aside from the fact that the terrain physics aren't debugged anymore (which is a good thing), my problem is still there. Waiting for your reply, thanks

Yes, i know you have 2.4, the physics debugging bug was a 2.4 bug. i just hoped josh fixed something else in latest engine.dll that would explain my 2.4 is working and your's is not

 

my code is exactly the same as you, and it works ...

     Phys1 := CreateBodyBox( 1,1,1 );
     Mesh1 := createcube(phys1);
     EntityType( Phys1, 1 );

     PositionEntity( Phys1, Vec3( playerposition.X, playerposition.Y+2, playerposition.Z ), 1 );

     Phys2 := CreateBodyBox( 1,1,1 );
     Mesh2 := createcube(phys2);
     EntityType( Phys2, 1 );

     PositionEntity( Phys2, Vec3( playerposition.X, playerposition.Y+0.5, playerposition.Z ), 1 );
     SetBodyMass( Phys2, 1 );

     CreateJointHinge( Phys1, Phys2, Vec3( playerposition.X, playerposition.Y+1, playerposition.Z ), Vec3(1, 0, 0) );

 

now i'm clueless

 

how many newton.dll and jointlibrary.dll do you find on your system ?

[Ywa]

how many newton.dll and jointlibrary.dll do you find on your system ?

 

Many thanks, there was no joinlibrary.dll in the binary folder ... Silly me