DG Car question

[Julio Jerez]

Ok I put the Beta 2.03 (only the PC build for now)
http://www.newtondynamics.com/downloads/NewtonWin-2.03.rar

It fixes the Bug with the RayCast car that only allowed set car oriented along the x local axis, now the chassis matrix that define the car orientation works as it should.
With this feature the user will not have a physically rotate the car geometry, setting the proper chassis matrix will do the trick.

Code: Select all

For example to create a car joint with a car moving along the x axis you can do this
1 0 0 0  // car direction of motion in local space
0 1 0 0  // up vector In local space
0 0 1 0  // tire rotation axis in local space
0 0 0 1 // always zero vector

// if your can geometry is oriented alone the z asis , then you set the chassis matrix to this
// Vet I think this is your situation
 0 0 1 0  // car direction of motion in local space point alone teh z axis
 0 1 0 0 // up vector In local space
-1 0 0 0 // tire rotation axis in local space poin alon the x axis
 0 0 0 1 // always zero vector

Please try that and see if it is better.

[VeT]

did you update only RayCastCar.cpp or dll is also updated?

[Julio Jerez]

every thing is updated apropietly specially CustomDGRayCastCar.cpp
you do not need to use RayCastCar.cpp exept for reference to see how to go about.

remember you do not need to mutiply the car axis matrix, to create a car you just do this after you create the rigid body

Code: Select all

NewtonCustomJoint *joint;
matrix[16] = {0, 0, 1, 0     0, 1, 0, 0     -1, 0, 0, 0,     0, 0, 0, 1};
NewtonCustomJoint *DGRaycastVehicleCreate (maxTireCount, matrix, NewtonBody* carBody);

this will make a car teh moves along teh z axis, as opposed to to the old tha moved sideways.
Plase let me knwo if it worked

[VeT]

//every thing is updated apropietly specially CustomDGRayCastCar.cpp
i asked because the size of dlls are the same


NewtonBodyGetMatrix(car_body,&tire_offset);
and
matrix[16] = {0, 0, 1, 0, 0, 1, 0, 0 -1, 0, 0, 0, 0, 0, 0, 1};
return the same result with sideway moving

on the other hand,
matrix[16] = {1, 0, 0, 0, 0, 1, 0, 0 0, 0, 1, 0, 0, 0, 0, 1};
works fine... i have no idea, why this happens

[VeT]

and what about wheels?
i create visual object, set matrix to position (20,20,-20), apply a large radius 55, but car ignores it

all 4 wheels made in the same way

Code: Select all

FLwheelPtr = ent_create("WheelL.mdl",nullvector,NULL);
   vec_set(tirepos,vector(20,20,-20));
   D3DXMatrixTranslation(&tire_offset, tirepos.x * QUANTTOMETER,tirepos.y * QUANTTOMETER,tirepos.z * QUANTTOMETER);
   DGRaycastVehicleAddTire(car_joint,FLwheelPtr,&tire_offset, 20,55,0.3,1.1,0.25,60,5,1);

looking like i missed something again

[Julio Jerez]

what is the problem?

[VeT]

car ignores wheels at all... it just fall down and dont move in better case, or fly ahead.. i'll upload video soon, but what it can be?

[Julio Jerez]

Maybe they are too close, 20 conetoneter converet to meter is 0.2

[VeT]

No, i played with values, looking like problem in another

One more question: why DGRaycastVehicleAddTire need pointer to the graphic body FLwheelPtr as 3-rd parameter?
As you said, this is fake-physic car wich works with rays and i must render wheel meshes with the help of DGRayCarGetShasisMatrix

[Julio Jerez]

I am writing a toturial tha I iwll send to Delfi so tah he can correct it and post in teh wiki.
Plus I am perfectingteh car joint.

Tha will clear all the confution.

[VeT]

okay, thanks, i'll wait
.. and study working examples