How to spawn hinges, fixates, and springs

[PhunWars]

But how can we do when we don't know the world position of an object ? For example I want to spawn a spring wich should be attached to the center of a square and to the plane which is down that square, but how can I do ?

PS: I have to use a laser so I use the onHitbylaser script

[windtalkers]

Cool tutorials! But how can I get the positions of the two circles, as world0pos := [-31.396013, 5.9814367]; world1pos := [-29.41792, 7.3022513] in your post?

[Someone Else]

Eh, I guess this bump was pretty well on-topic.

@PhunWars and windtalkers: Try these codes:

I use onCollide, so I will use the relevant codes here. The spawning code is the same as for lasers, though.

• Make a circle.
• A little ways below that, make an angled box.
• A little ways below that, make another angled box, so the circle will bounce off the top one exactly once, then the bottom one exactly once.
• Fixate both boxes to the background.
• In the top box goes this code:

  Code: Select all

  scene.addCircle({
   pos := e.pos + [-10, 20];
   geomID := 1
});
scene.addCircle({
    pos := e.pos + [10, 20];
    geomID := 2
})

• In the bottom box goes this code:

  Code: Select all

  scene.addHinge({
   geom0 := 1;
   geom1 := 2;
   geom0pos := [0, 2];
   geom1pos := [0, -2];
   size = 1
})

It spawns the hinge using geom0pos, the position relative to that geom's center of mass. Geom0pos := [0, 0] is the center of the object. Note that this code also spawns the hinge outside the objects.

NOTE: I learned this trick from Kilinich's hinge-spawn cursor.

[FuzzyLogicBrain]

well thats cool, but what if i want an obect to be spawned, with a fix joint, onto an existing object, becase i find the the geom id for the spawned object changes whether or not i state the geom id.
sorry for the bump

[TC42]

Not possible, unfortunately. The geomID of the existing object will be subject to change, and if you don't have the geomID of the existing object, the fixate will be fixated between the background and the spawned object. Is this what is happening, or is no fixate spawning at all?

[FuzzyLogicBrain]

No there is a fix joint. >:( Why is it so difficult to do something on algodoo?

[Chronos]

Because Algodoo is a physics simulator, not a coding program.

[FuzzyLogicBrain]

I don't code.