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Added comment with the range of the noise functions.

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This commit is contained in:
Sander Schobers 2020-05-15 10:20:54 +02:00
parent 52494022f6
commit cc72cd1171
1 changed files with 2 additions and 0 deletions
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2
noise/perlin.go
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@ -30,6 +30,7 @@ func perlinLerp(t, a, b float64) float64 { return a + t*(b-a) }
func perlinAt2D(q [2]float64, rx, ry float64) float64 { return rx*q[0] + ry*q[1] } func perlinAt2D(q [2]float64, rx, ry float64) float64 { return rx*q[0] + ry*q[1] }
// noise2d generates 2-dimensional noise. The result is in range [-sqrt(1/4),sqrt(1/4)].
func (p *Perlin) noise1d(x float64) float64 { func (p *Perlin) noise1d(x float64) float64 {
tx := x + perlinN tx := x + perlinN
bx0 := int(tx) & perlinBM bx0 := int(tx) & perlinBM
@ -44,6 +45,7 @@ func (p *Perlin) noise1d(x float64) float64 {
return perlinLerp(sx, u, v) return perlinLerp(sx, u, v)
} }
// noise2d generates 2-dimensional noise. The result is in range [-sqrt(1/2),sqrt(1/2)].
func (p *Perlin) noise2d(x, y float64) float64 { func (p *Perlin) noise2d(x, y float64) float64 {
tx := x + perlinN tx := x + perlinN
bx0 := int(tx) & perlinBM bx0 := int(tx) & perlinBM