详细描述

函数
Float	SNoiseP ( 向量 p, Float t, Int32 t_repeat)
Float	TurbulenceP ( 向量 p, Float t, Float oct, Bool abs, Int32 t_repeat)
Float	FbmP ( Float *table, 向量 p, Float t, Float oct, Int32 t_repeat)
Float	RidgedMultifractalP ( Float *table, 向量 p, Float t, Float oct, Float offset, Float gain, Int32 t_repeat)

变量
static const Int32	NOISE_RESOLUTION

Function Documentation

◆  SNoiseP()

Float SNoiseP	(	向量	p ,
		Float	t ,
		Int32	t_repeat
	)

Generates a periodic signed noise value.

参数

[in]	p	The noise coordinate.
[in]	t	The time.
[in]	t_repeat	The time repeat. Must be 2^ x - 1 ，其中 x = [ 1 .. 10 ], i.e. one of 1 , 3 , 7 , 15 , 31 , 63 , 127 , 255 , 511 ，和 1023 . A noise repeats itself in time every 1024 units. Using a smaller t_repeat the noise will repeat at an earlier time.

返回

The signed noise value, between -1.0 and 1.0 .

◆  TurbulenceP()

Float TurbulenceP	(	向量	p ,
		Float	t ,
		Float	oct ,
		Bool	abs ,
		Int32	t_repeat
	)

Generates a periodic turbulence value, this is a sum of multiple noises with different frequency.

参数

[in]	p	The noise coordinate.
[in]	t	The time.
[in]	oct	The number of octaves.
[in]	abs	true for the absolute value.
[in]	t_repeat	The time repeat. Must be 2^ x - 1 ，其中 x = [ 1 .. 10 ], i.e. one of 1 , 3 , 7 , 15 , 31 , 63 , 127 , 255 , 511 ，和 1023 . A noise repeats itself in time every 1024 units. Using a smaller t_repeat the noise will repeat at an earlier time.

返回

The turbulence value, between -1.0 and 1.0 unless abs is true , in which case it will be between 0.0 to 1.0 .

◆  FbmP()

Float FbmP	(	Float *	table ,
		向量	p ,
		Float	t ,
		Float	oct ,
		Int32	t_repeat
	)

Generates a periodic Fractional Brownian Motion value.

注意

InitFbm() must be called before this function.

参数

[in]	table	The preallocated and initialized table by InitFbm() . The caller owns the pointed array.
[in]	p	The evaluation point.
[in]	t	The time.
[in]	oct	The number of octaves. Must not exceed the max_octaves value passed to InitFbm() , but can be lower.
[in]	t_repeat	The time repeat. Must be 2^ x - 1 ，其中 x = [ 1 .. 10 ], i.e. one of 1 , 3 , 7 , 15 , 31 , 63 , 127 , 255 , 511 ，和 1023 . A noise repeats itself in time every 1024 units. Using a smaller t_repeat the noise will repeat at an earlier time.

返回

The fBm value.

◆  RidgedMultifractalP()

Float RidgedMultifractalP	(	Float *	table ,
		向量	p ,
		Float	t ,
		Float	oct ,
		Float	offset ,
		Float	gain ,
		Int32	t_repeat
	)

Generates a periodic fractal function used for such things as landscapes or mountain ranges.

注意

InitFbm() must be called before this function.

参数

[in]	table	The preallocated and initialized table by InitFbm() . The caller owns the pointed array.
[in]	p	The evaluation point.
[in]	t	The time.
[in]	oct	The number of octaves. Must not exceed the max_octaves value passed to InitFbm() , but can be lower.
[in]	offset	The zero offset, this controls the multi-fractal.
[in]	gain	The amplification of the fractal value.
[in]	t_repeat	The time repeat. Must be 2^ x - 1 ，其中 x = [ 1 .. 10 ], i.e. one of 1 , 3 , 7 , 15 , 31 , 63 , 127 , 255 , 511 ，和 1023 . A noise repeats itself in time every 1024 units. Using a smaller t_repeat the noise will repeat at an earlier time.

返回

The fractal value.

Variable Documentation

◆  NOISE_RESOLUTION

const Int32 NOISE_RESOLUTION static

Noise resolution.