noise-utilities/Runtime/PerlinNoise3DGizmo.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

namespace KairoEngine.NoiseUtilities
{
    public class PerlinNoise3DGizmo : MonoBehaviour
    {
        public bool cubeBoundries = false;
        public int size = 10;
        public int height = 20;
        public int width = 20;
        public int depth = 20;

        public float frequency = 1.01f;
        private Vector3[] points;

        void Start()
        {
            InstantiatePoints();
        }

        private void FixedUpdate()
        {
            UpdateMesh();
        }
        void UpdateMesh()
        {
            if (cubeBoundries)
            {
                height = size;
                width = size;
                depth = size;
            }
            InstantiatePoints();
        }

        void InstantiatePoints()
        {
            points = new Vector3[height * width * depth];

            for (int z = 0, i = 0; z < depth; z++)
            {
                for (int y = 0; y < height; y++)
                {
                    for (int x = 0; x < width; x++)
                    {
                        points[i] = new Vector3(x, y, z);
                        i++;
                    }
                }
            }
        }

        private void OnDrawGizmos()
        {
            if (points != null)
            {
                for (int i = 0; i < points.Length; i++)
                {

                    float sample = PerlinNoise3D.get3DPerlinNoise(points[i], frequency);

                    sample = (sample + 1f) / 2f;
                    Gizmos.color = new Color(sample, sample, sample, 1);

                    Gizmos.DrawSphere(points[i], 0.3f);
                }
            }
        }

        [CustomEditor(typeof(PerlinNoise3DGizmo))]
        public class PerlinNoise3DGizmoEditor : Editor
        {
            override public void OnInspectorGUI()
            {
                var myScript = target as PerlinNoise3DGizmo;

                myScript.cubeBoundries = GUILayout.Toggle(myScript.cubeBoundries, "Enable Box Size:");

                if (!myScript.cubeBoundries)
                {
                    myScript.depth = EditorGUILayout.IntSlider("Depth:", myScript.depth, 1, 30);
                    myScript.height = EditorGUILayout.IntSlider("Heigth:", myScript.height, 1, 30);
                    myScript.width = EditorGUILayout.IntSlider("Width:", myScript.width, 1, 30);
                }
                else
                {
                    myScript.size = EditorGUILayout.IntSlider("Box Size:", myScript.depth, 1, 30);
                }
                myScript.frequency = EditorGUILayout.FloatField("Frequency:", myScript.frequency);


            }
        }

    }
}