PH_SLIDER (Problems in Z axis)

I was trying out Slider Constraint

I made 2 map entities -
1. Hollow Cylinder (One end open)
2. Cylinder with a smaller radius

Something same as the image given in the manual (without the cube though)

I am unable to move them on Z axis

here is my code

// Attached to the cylinder of lower radius

action upper
{
Up_Piston=my;
my.shadow=on;

while(Dw_Piston==NULL){wait(1);}

phent_settype(my,PH_RIGID,PH_BOX);

sleep(1);

phent_setgroup(my,2);
phent_setmass(my,10,PH_BOX);
phent_setfriction(my,0);
phent_setelasticity(my,0,0);
phent_setdamping(my,0,0);
vec_set(p2,vector(0,0,1));
vec_set(p3,vector(-400,400,0));
UPPER_ID=phcon_add(PH_SLIDER,Dw_Piston,my);
phcon_setparams1(UPPER_ID,p2,nullvector,nullvector);
phcon_setparams2(UPPER_ID,p3,nullvector,nullvector);
}

// attached to hollow cylinder
action lower
{

Dw_Piston=my;
my.shadow=on;

while(Up_Piston==NULL){wait(1);}

phent_settype(my,PH_RIGID,PH_BOX);

sleep(1);

phent_setgroup(my,2);
phent_setmass(my,10,PH_BOX);
phent_setfriction(my,0);
phent_setelasticity(my,0,0);
phent_setdamping(my,0,0);

}

// forces

if(key_a==1)
{
vec_set(m1,vector(-50,250,0));
phcon_setmotor(UPPER_ID,m1,nullvector,nullvector);
}
if(key_s==1)
{
vec_set(m1,vector(50,250,0));
phcon_setmotor(UPPER_ID,m1,nullvector,nullvector);
}

If i keep the entire system verticle it doesnt work

if i rotate the entire system and change p2 to
vec_set(p2,vector(1,0,0));
Same code works.

Moreover if i use PH_CYLINDER instead of PH_BOX my cylinders just penitrate the floor and disappear (as if no collision)

I am still stuck on this
maybe i am doing some really stupid error

Any helps please

i tried to use a slider for the first time now. it doesn't work at all for me! i experimented with it for over one hour but there seems to be no way to get it working.

and i get an error E1513 with:

slider1_id=phcon_add(PH_SLIDER,my,0);

why isn't it possible to constrain it to the world?

i found my mistake! i constrained the slider and some other objects to an anchor object with mass 0. all objects that get connected to an object with mass 0 seem to freeze. and if other physics objects collide with the frozen constrained objects they freeze too! marco, is this a bug?

now i use a hinge constrained to the world for my anchor object.

@greyplasma: try to use bigger force values for your motors. i had to use values around 100000 to get it moving...

...using a combination of more than 15 constraints i have a fully functional crane simulator now! with realistic wire physics!

...wow! controlling a crane is really difficult!

Thanks Ventilator,

It worked finally, you were right about appying a higher force value,

Your crane simulator seems really nice, please do share your programming experiences.

Thanks

quote:

---

Originally posted by ventilator:
and i get an error E1513 with:
slider1_id=phcon_add(PH_SLIDER,my,0);
why isn't it possible to constrain it to the world?

---

Because of a bug in the engine- I am trying to query the 2nd object's position, which is not a good idea if there is no second object..
Fixed.