How to spawn an object at the same speed and direction

[Zapi]

Is it possible to spawn an object (in this case, a circle) at the same speed and direction as the spawner (a object that a laser hits inside a rocket that i am making)?

I have some code already, but if I use it as a backwards rocket, or a maneuvering rocket, the spawned mass collides with the rocket and can cause problems.

Code: Select all

(e)=>{scene.addcircle({radius := 0.5;pos := e.pos;friction := 0;density := 5;collideSet := 7;heterocollide := true;color := [0.7, 0, 0, 0.6]}) }

[Matten]

How does your rocket looks like?
If it's made like most spawning rockets it could be done without scripting.

[electronicboy]

look on algobox and look for the k probe. you should be able to extract info from that to use in there spawn script. no promise though.

[Zapi]

How does your rocket looks like?
If it's made like most spawning rockets it could be done without scripting.

Well, I use a object in a tunnel and a laser mounted on a rectangle. When the laser hits the object, the object runs the script i have posted to create a ball, moving at zero meters per second (which is the problem; i want the ball to spawn at the same velocity as the rocket). Above the tunnel is a repeller object that pushes the ball away from the rocket. Newton's third law means that because the ball is pushed away (and the rocket is obviously not mounted to the background), the rocket is pushed alittle as well.

I hope this is what you mean

[Rideg]

I did a spawner once that wpaned them with the same speed and direction. Can't find it now though...

[Kilinich]

Is it possible to spawn an object (in this case, a circle) at the same speed and direction as the spawner (a object that a laser hits inside a rocket that i am making)?

I have some code already, but if I use it as a backwards rocket, or a maneuvering rocket, the spawned mass collides with the rocket and can cause problems.

Code: Select all

(e)=>{scene.addcircle({radius := 0.5;pos := e.pos;friction := 0;density := 5;collideSet := 7;heterocollide := true;color := [0.7, 0, 0, 0.6]}) }

No problem
Just save prev pos and calculate speed on every tick.

[Zapi]

No problem
Just save prev pos and calculate speed on every tick.

Do you have code?

[Kilinich]

sure.
here example for box (+ laser).
textureMatrix used just for example, can be replaced with global var.

Code: Select all

onHitBylaser = (e) => {
  currentVel := (e.pos - [textureMatrix(0), textureMatrix(1)]) / (sim.time - textureMatrix(2));
  textureMatrix = e.pos ++ [sim.time] ++ [0,0,0,0,0,0];
//  ... you can now use currentVel in spawn script
}


p.s. didn't test, but you get the point

[Zapi]

actually, that's confusing to me. i need help with implementing it. i tried pasting the code you have me in, but the mass still spawns at zero meters per second.

I just need to get the velocity of the rocket, and spawn the exhaust at the same velocity so that the rocket will work backwards. is there any way to get the velocity of the object that the laser hits?

[Rideg]

what does the "++" mean? :O

[Zapi]

i don't know what it means.

[Nait]

actually, that's confusing to me. i need help with implementing it. i tried pasting the code you have me in, but the mass still spawns at zero meters per second.

I just need to get the velocity of the rocket, and spawn the exhaust at the same velocity so that the rocket will work backwards. is there any way to get the velocity of the object that the laser hits?

Here

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(e)=>{scene.addcircle({ // Your code\\ ; vel:=currentVel}); currentVel := (e.pos - [textureMatrix(0), textureMatrix(1)]) / (sim.time - textureMatrix(2)); textureMatrix = e.pos ++ [sim.time] ++ [0,0,0,0,0,0] }}

Instead currentVel you can use property of spawner, like Friction, or ControllerAcc...

PS
I didn't test it also, if doesn't work, report me
--------

what does the "++" mean? :O

This is adding for lists.

Code: Select all

[1,0]++[2,3]=[1,0,2,3]

Hope you understand me

[Rideg]

I belive I do. Thank you for the mini-tutorial ;D