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Update SimplexNoise2D with correct constants

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Closes #64
This commit is contained in:
Edwin Jakobs
2020-04-06 19:46:30 +02:00
parent 0de7426017
commit ac248b1a2e
1 changed files with 7 additions and 9 deletions
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16
orx-noise/src/main/kotlin/SimplexNoise2D.kt
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@@ -1,7 +1,8 @@
package org.openrndr.extra.noise
private const val G2 = 1.0 / 4.0
private const val F2 = 1.0 / 2.0
private const val SQRT3 = 1.7320508075688772935274463415059
private const val F2 = 0.5 * (SQRT3 - 1.0)
private const val G2 = (3.0 - SQRT3) / 6.0
fun simplex(seed: Int, x: Double, y: Double): Double {
var t = (x + y) * F2
@@ -9,11 +10,8 @@ fun simplex(seed: Int, x: Double, y: Double): Double {
val j = (y + t).fastFloor()
t = ((i + j) * G2)
val X0 = i - t
val Y0 = j - t
val x0 = x - X0
val y0 = y - Y0
val x0 = x - (i - t)
val y0 = y - (j - t)
val i1: Int
val j1: Int
@@ -27,8 +25,8 @@ fun simplex(seed: Int, x: Double, y: Double): Double {
val x1 = (x0 - i1 + G2)
val y1 = (y0 - j1 + G2)
val x2 = (x0 - 1 + F2)
val y2 = (y0 - 1 + F2)
val x2 = (x0 - 1 + 2 * G2)
val y2 = (y0 - 1 + 2 * G2)
val n0: Double
val n1: Double