noise.qh File Reference

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Functions
	classfield (Noise).float noise_baccum
	entityclass (Noise)
ERASEABLE float	Noise_Brown (entity e, float dt)
ERASEABLE float	Noise_Burst (entity e, float dt, float p)
	+1 or -1 More...
ERASEABLE float	Noise_Pink (entity e, float dt)
ERASEABLE float	Noise_White (entity e, float dt)

Function Documentation

classfield()

classfield

(

Noise

)

entityclass()

entityclass

(

Noise

)

Noise_Brown()

ERASEABLE float Noise_Brown	(	entity	e,
		float	dt
	)

Definition at line 12 of file noise.qh.

References ERASEABLE, random(), and sqrt().

{
    e.noise_baccum += random() * sqrt(dt);  // same stddev for all dt
    return e.noise_baccum;
}

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Noise_Burst()

ERASEABLE float Noise_Burst	(	entity	e,
		float	dt,
		float	p
	)

+1 or -1

Definition at line 35 of file noise.qh.

References random().

{
    if (random() > (p ** dt)) e.noise_bstate = !e.noise_bstate;
    return 2 * e.noise_bstate - 1;
}

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Noise_Pink()

ERASEABLE float Noise_Pink	(	entity	e,
		float	dt
	)

Definition at line 18 of file noise.qh.

References ERASEABLE, and random().

Referenced by View_NightVision().

{
    float f;
    f = dt * 60;
    // http://home.earthlink.net/~ltrammell/tech/pinkalg.htm
    if (random() > (0.3190 ** f)) e.noise_paccum = 0.34848 * (2 * random() - 1);
    if (random() > (0.7756 ** f)) e.noise_paccum2 = 0.28768 * (2 * random() - 1);
    if (random() > (0.9613 ** f)) e.noise_paccum3 = 0.43488 * (2 * random() - 1);
    return e.noise_paccum + e.noise_paccum2 + e.noise_paccum3;
}

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Noise_White()

ERASEABLE float Noise_White	(	entity	e,
		float	dt
	)

Definition at line 29 of file noise.qh.

References ERASEABLE, and random().

Referenced by View_NightVision().

{
    return random() * 2 - 1;
}

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