noise.qh File Reference

#include "random.qh"

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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
ERASEABLE float	Noise_Pink (entity e, float dt)
ERASEABLE float	Noise_White (entity e, float dt)

Function Documentation

classfield()

classfield

(

Noise

)

References ERASEABLE.

entityclass()

entityclass

(

Noise

)

Noise_Brown()

ERASEABLE float Noise_Brown	(	entity	e,
		float	dt )

Definition at line 14 of file noise.qh.

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

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

Noise_Burst()

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

+1 or -1

Definition at line 36 of file noise.qh.

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

References entity(), and random().

Noise_Pink()

ERASEABLE float Noise_Pink	(	entity	e,
		float	dt )

Definition at line 20 of file noise.qh.

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

References crandom, entity(), and random().

Referenced by View_NightVision().

Noise_White()

ERASEABLE float Noise_White	(	entity	e,
		float	dt )

Definition at line 30 of file noise.qh.

{
    return random() * 2 - 1;
}

References entity(), and random().

Referenced by View_NightVision().