Flame Painter Dev Thread

[k1net1k]

dude thats fucking awesome

[avansc]

My attempt, i have a few parameters like noise, focus, force, and size, kinda tried to just emulate the applet thing.

If anyone is interested I'll chuck the source out there.

[pritam]

My attempt, i have a few parameters like noise, focus, force, and size, kinda tried to just emulate the applet thing.

If anyone is interested I'll chuck the source out there.

Nice, and please do

[xiphirx]

My attempt, i have a few parameters like noise, focus, force, and size, kinda tried to just emulate the applet thing.

If anyone is interested I'll chuck the source out there.

Since I sorta want to do this on my own... no D:

Just shows my shitty physics skills since you got way better results in one build :P

[avansc]

Since I sorta want to do this on my own... no D:

Just shows my shitty physics skills since you got way better results in one build :P

I'll just put the zip up.

I use almost no physics on this one, this is literally the only physics, and that just describes the motion of a independent particle.

Code: Select all

void Painter::update(const float dt)
{
	this->vel.x += this->accel.x * dt;
	this->vel.y += this->accel.y * dt;
	
	this->pos.x += this->vel.x*dt + (this->accel.x*dt*dt)/2; 
	this->pos.y += this->vel.y*dt + (this->accel.y*dt*dt)/2; 
	
	this->accel.x = 0;
	this->accel.y = 0;
	
	this->vel.x *= 0.999;
	this->vel.y *= 0.999;	
}

[xiphirx]

Thanks for that.

I'm currently trying to fix my delta timing stuff... timestep is messing up when you fullscreen it :/

[dandymcgee]

Out of curiosity, where in the world did you come up with that code, avansc?

[avansc]

Out of curiosity, where in the world did you come up with that code, avansc?

These are all just kinematic motion equations.

okay lets take a look


the first bit is the velocity equation, accel here really is just a force acting on the particle.

this->vel.x += this->accel.x * dt;
this->vel.y += this->accel.y * dt;

Velocity_final = Velocity_initial + acceleration * delta_time // acceleration pertime gives velocity

now that we have out current velocity we can use the displacement equation. i just used this one, but there are many, V = D/T and so on.

this->pos.x += this->vel.x*dt + (this->accel.x*dt*dt)/2;
this->pos.y += this->vel.y*dt + (this->accel.y*dt*dt)/2;


I reset the "force"

this->accel.x = 0;
this->accel.y = 0;

This part just dampens there velocity, a kind of friction if you will.

this->vel.x *= 0.999;
this->vel.y *= 0.999;
}

http://en.wikipedia.org/wiki/Kinematics

[xiphirx]

Hmm... So I tried to put what you had in your update function avansc, but I get pretty bad results... How do you calculate the acceleration?

[avansc]

being bored.
http://img443.imageshack.us/img443/1778 ... 8at422.png

something like that.

Code: Select all

for(int a = 0;a < MAX;a++)
	{
		cVec2 t = cVec2(tx,ty);
		t -= it[a]->pos;
		
		//t.normalize();
		
		/*
		 FORCE = general attraction force : 0.3f
		 FOCUS = total spread	: 1.0f
		 SPRING = force that keeps ajacent particles together : 10.0f
		 */
		float f = ((a+1)/(float)MAX)/FORCE*(FOCUS - ((a+1)/((float)MAX+SPRING)));
		
		t*=f;
		
		//apply accel
		it[a]->accel.setX(t.getX());
		it[a]->accel.setY(t.getY());
		
		//some noise
		it[a]->vel.x += (NOISE*(rand()%1000/999.0f-0.5f));
		it[a]->vel.y += (NOISE*(rand()%1000/999.0f-0.5f));
	}

[eatcomics]

That would make an awesome screensaver.

That's exactly what I did, and its a bad ass one :D

[GroundUpEngine]

This looks awesome!

That would make an awesome screensaver.

Agreed!

[Falco Girgis]

This thread is win. Avansc is a bamf!

[MrDeathNote]

I'll just put the zip up.

Did you ever put this up, i'd definitely like to have a look at the source

[avansc]

I'll just put the zip up.

Did you ever put this up, i'd definitely like to have a look at the source

I'll get on that, It's just very very messy atm. but i'll chuck something out there.