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Gecko

particle system problems

6 posts in this topic

i''m working on a particle system right now and am having some trouble with the latest part. i''m trying to make the particles always have acceleration towards the cursor position. i''m sure you''ve all seen those little java apps on the net where the particles follow your cursor around and kind of orbit it. i''d appreciate some help
_________________Gecko___ Gecko Design
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Sure thing, It''s easy...

void GetAcceleration(whatever *particle, whatever *mouse, Vector *accel)
{
/* Get the vector from the particle to the mouse. */
VectorSubtract(mouse->origin, particle->origin, accel);

/* Normalize the above vector (ie make it a 1 unit long vector). */
VectorNormalize(accel);

/* Now scale the vector to your rate of acceleration. */
VectorScale(accel, 10.0);
}

Answer your question? I can provide more details if you want... I''m not sure how much help you need
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yes i know i have to make them myself. my question was HOW do i make them. actually the only one i need help with is VectorNormalize.


_________________Gecko___
Gecko Design
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To normalize a vector, all you have to do is divide by its length. For example, if your vector

v = (x, y)

then the length is just

/v/ = sqrt(x^2 + y^2)

thus the normalized vector will be:

(x, y)//v/ = (x//v/, y//v/)

Simple... hope that helps

(There''s some room for optimization in the math... especially in the sqrt() function which could probably just be aproximated with exceptable result.)
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Woah! most of those slashes are supposed to be vertical bars ''/'' I wonder why that happend... Oh, well... they are supposed to be the absolute value (ie, the normalized value) of the v vector.
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