29 lines
633 B
Go
29 lines
633 B
Go
package math
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import (
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opensimplex "github.com/ojrac/opensimplex-go"
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)
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// Noise utility to sample simplex noise
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type Noise struct {
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opensimplex.Noise
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Seed int
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Freq float32
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}
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// NewNoise creates a new noise struct from a seed value and a frequency factor.
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func NewNoise(seed int, freq float32) *Noise {
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return &Noise{
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Noise: opensimplex.New(int64(seed)),
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Seed: seed,
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Freq: freq,
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}
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}
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// Sample the noise at a certain position
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func (n *Noise) Sample(x, y, z int) float32 {
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// jeez
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fx, fy, fz := float64(float32(x)*n.Freq), float64(float32(y)*n.Freq), float64(float32(z)*n.Freq)
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return float32(n.Eval3(fx, fy, fz))
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}
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