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henrykl

creating Particle system. problem with the spread

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Hello all,

i have been working on a particle system for a while now, but its just not coming together the way i need it too. i am at my wits end with it. the main prblem i have is that my spread doesnt spread at all, it lingers trailing behind the object its attached to.

heres how i start it

p->SetDirection ( Vector2D_Rotate(direction,DegreesToRadians(float(rand() % int(Spreadrate)))));
pos.fX =(float) m_vStartPosX;
pos.fY =(float) m_vStartPosY;
p->setPosition(pos);

and its update



m_vPosition.fX += Direction.fX * m_vVelocity.fX * dt;
m_vPosition.fY += Direction.fY * m_vVelocity.fY * dt;

any help would be much appreciated

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  1. When using [font=courier new,courier,monospace]rand()[/font] like that, you should actually do it like: [font=courier new,courier,monospace]static_cast<float>(rand()) / static_cast<float>(RAND_MAX + 1.0f) * Spreadrate[/font]. See this on why.
  2. There isn't anything obvious from this... You're sure that [font=courier new,courier,monospace]DegreesToRadians()[/font] and [font=courier new,courier,monospace]Vector2D_Rotate()[/font] work properly and are returning the correct values? Step through it with a debugger and find out what these functions are receiving as parameters and what they're returning, and make sure they're correct. Make sure your randomness is working correctly.
  3. Are you initializing the random library properly? You have to call [font=courier new,courier,monospace]srand()[/font] once (and only once) in your program before you can start calling [font=courier new,courier,monospace]rand()[/font].

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