HitscanEffect.cpp File Reference

Implementation of hitscan energy beam with fBm path deviation. More...

#include "HitscanEffect.hpp"
#include <algorithm>
#include <cmath>
#include <cstdlib>
#include <glm/glm.hpp>
#include <glm/gtc/constants.hpp>

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Functions
static float	randf ()
	Return a random float in [0, 1].
static float	hash1 (int n)
	Good avalanche hash – gives uniform [0,1] output for any integer input.
static float	vnoise (float t)
	1-D value noise with cubic (smoothstep) interpolation.
static float	fbm (float t, float seed, float time, int octaves=4)
	4-octave fBm displacement (lacunarity ~ 3, persistence ~ 0.4).
static float	wfbm (float t, float seed, float warpSeed, float time, int octaves=4)
	Domain-warped fBm: warp t before sampling.

Detailed Description

Implementation of hitscan energy beam with fBm path deviation.

Function Documentation

fbm()

static float fbm ( float  t, float  seed, float  time, int  octaves = 4  )

static

4-octave fBm displacement (lacunarity ~ 3, persistence ~ 0.4).

Higher octaves run at 2x the animation speed of the one below them, giving slow large-scale breathing overlaid with fast fine crackle.

Parameters

t	Sample position along the arc [0, 1].
seed	Base seed for this noise instance.
time	Elapsed animation time (drives temporal evolution).
octaves	Number of fBm octaves to sum.

Returns

Displacement value in approximately [-1, +1].

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hash1()

static float hash1 ( int  n )

static

Good avalanche hash – gives uniform [0,1] output for any integer input.

Parameters

n	Integer input.

Returns

Hashed value in [0, 1].

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randf()

static float randf ( )

static

Return a random float in [0, 1].

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vnoise()

static float vnoise ( float  t )

static

1-D value noise with cubic (smoothstep) interpolation.

Continuous in t.

Parameters

t	Sample position along the noise domain.

Returns

Noise value in [0, 1].

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wfbm()

static float wfbm ( float  t, float  seed, float  warpSeed, float  time, int  octaves = 4  )

static

Domain-warped fBm: warp t before sampling.

Warping causes frequency content to vary spatially – some regions are smooth, others suddenly jagged – matching how real lightning looks.

Parameters

t	Sample position along the arc [0, 1].
seed	Base fBm seed.
warpSeed	Seed for the domain warp noise.
time	Elapsed animation time.
octaves	Number of fBm octaves to sum.

Returns

Warped displacement value in approximately [-1, +1].

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