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using UnityEngine;
using UnityEditor;
using System.Threading.Tasks;
public class GenerateNoise : EditorWindow
{
enum NoiseType { WhiteNoise, WorleyNoise, WorleyEdgeSDF }
enum DistanceMetric { L1, L2, LInfinity }
NoiseType _type = NoiseType.WhiteNoise;
int _resolution = 32;
int _texelsPerCell = 8;
DistanceMetric _metric = DistanceMetric.L2;
float _sdfRadius = 0.5f;
[MenuItem("Tools/yum_food/Generate 3D Noise")]
static void Open() => GetWindow<GenerateNoise>("Generate 3D Noise");
void OnGUI()
{
EditorGUILayout.LabelField("Noise Settings", EditorStyles.boldLabel);
_type = (NoiseType)EditorGUILayout.EnumPopup("Type", _type);
if (_type == NoiseType.WhiteNoise)
{
_resolution = EditorGUILayout.IntField("Resolution", _resolution);
_resolution = Mathf.Clamp(_resolution, 2, 512);
}
else
{
_resolution = EditorGUILayout.IntField("Cell Count", _resolution);
_resolution = Mathf.Clamp(_resolution, 2, 512);
_texelsPerCell = EditorGUILayout.IntSlider("Texels Per Cell", _texelsPerCell, 2, 64);
_metric = (DistanceMetric)EditorGUILayout.EnumPopup("Distance Metric", _metric);
if (_type == NoiseType.WorleyEdgeSDF)
_sdfRadius = EditorGUILayout.Slider("SDF Radius (cells)", _sdfRadius, 0.1f, 2f);
EditorGUILayout.HelpBox($"Texture resolution: {_resolution * _texelsPerCell}\u00b3", MessageType.None);
}
EditorGUILayout.Space();
if (GUILayout.Button("Generate"))
DoGenerate();
}
void DoGenerate()
{
int res = _type == NoiseType.WhiteNoise ? _resolution : _resolution * _texelsPerCell;
Texture3D tex;
switch (_type)
{
case NoiseType.WorleyNoise:
{
tex = new Texture3D(res, res, res, TextureFormat.R8, false);
GenerateWorleyField(res, _texelsPerCell, _metric, out var f1, out _);
var pixels = new byte[res * res * res];
for (int i = 0; i < pixels.Length; i++)
pixels[i] = (byte)Mathf.RoundToInt(Mathf.Clamp01(f1[i]) * 255f);
tex.SetPixelData(pixels, 0);
break;
}
case NoiseType.WorleyEdgeSDF:
{
tex = new Texture3D(res, res, res, TextureFormat.R8, false);
GenerateWorleyField(res, _texelsPerCell, _metric, out var f1, out var f2);
var pixels = new byte[res * res * res];
GenerateEdgeSDF(pixels, f2, _sdfRadius);
tex.SetPixelData(pixels, 0);
break;
}
default:
{
tex = new Texture3D(res, res, res, TextureFormat.RGBA32, false);
var pixels = new Color32[res * res * res];
GenerateWhiteNoise(pixels);
tex.SetPixels32(pixels);
break;
}
}
tex.wrapMode = TextureWrapMode.Repeat;
tex.filterMode = FilterMode.Bilinear;
tex.Apply();
string name;
switch (_type)
{
case NoiseType.WorleyNoise: name = $"WorleyNoise3D_{_metric}_{res}"; break;
case NoiseType.WorleyEdgeSDF: name = $"WorleyEdgeSDF3D_{_metric}_{res}"; break;
default: name = $"WhiteNoise3D_{res}"; break;
}
string path = $"Assets/yum_food/3ner/Textures/{name}.asset";
if (!AssetDatabase.IsValidFolder("Assets/yum_food/3ner/Textures"))
AssetDatabase.CreateFolder("Assets/yum_food/3ner", "Textures");
AssetDatabase.CreateAsset(tex, path);
AssetDatabase.SaveAssets();
EditorGUIUtility.PingObject(tex);
Debug.Log($"[GenerateNoise] Saved {_type} ({res}\u00b3) to {path}");
}
static void GenerateWhiteNoise(Color32[] pixels)
{
for (int i = 0; i < pixels.Length; i++)
{
byte r = (byte)Random.Range(0, 256);
byte g = (byte)Random.Range(0, 256);
byte b = (byte)Random.Range(0, 256);
byte a = (byte)Random.Range(0, 256);
pixels[i] = new Color32(r, g, b, a);
}
}
static void GenerateWorleyField(int res, int texelsPerCell, DistanceMetric metric,
out float[] f1, out float[] edgeDist)
{
int cellCount = Mathf.Max(1, res / texelsPerCell);
float cellSize = (float)res / cellCount;
float rcpCellSize = 1f / cellSize;
var points = new Vector3[cellCount * cellCount * cellCount];
for (int cz = 0; cz < cellCount; cz++)
for (int cy = 0; cy < cellCount; cy++)
for (int cx = 0; cx < cellCount; cx++)
{
int ci = cx + cellCount * (cy + cellCount * cz);
points[ci] = new Vector3(
(cx + Random.value) * cellSize,
(cy + Random.value) * cellSize,
(cz + Random.value) * cellSize);
}
float rcpMaxDist = rcpCellSize;
int count = res * res * res;
var f1Arr = new float[count];
var edgeArr = new float[count];
bool isL2 = metric == DistanceMetric.L2;
bool isL1 = metric == DistanceMetric.L1;
Parallel.For(0, res, z =>
{
for (int y = 0; y < res; y++)
for (int x = 0; x < res; x++)
{
float px = x + 0.5f, py = y + 0.5f, pz = z + 0.5f;
int cx0 = (int)(px * rcpCellSize);
int cy0 = (int)(py * rcpCellSize);
int cz0 = (int)(pz * rcpCellSize);
// Pass 1: Find closest point (metric determines cell ownership)
float bestDist = float.MaxValue;
float p1x = 0, p1y = 0, p1z = 0;
int p1nx = 0, p1ny = 0, p1nz = 0;
for (int dz = -1; dz <= 1; dz++)
for (int dy = -1; dy <= 1; dy++)
for (int dx = -1; dx <= 1; dx++)
{
int ncx = cx0 + dx, ncy = cy0 + dy, ncz = cz0 + dz;
int wcx = ((ncx % cellCount) + cellCount) % cellCount;
int wcy = ((ncy % cellCount) + cellCount) % cellCount;
int wcz = ((ncz % cellCount) + cellCount) % cellCount;
var pt = points[wcx + cellCount * (wcy + cellCount * wcz)];
float qx = pt.x + (ncx - wcx) * cellSize;
float qy = pt.y + (ncy - wcy) * cellSize;
float qz = pt.z + (ncz - wcz) * cellSize;
float ex = qx - px, ey = qy - py, ez = qz - pz;
float dist;
if (isL1)
{
float ax = ex < 0 ? -ex : ex, ay = ey < 0 ? -ey : ey, az = ez < 0 ? -ez : ez;
dist = ax + ay + az;
}
else if (isL2)
{
dist = ex * ex + ey * ey + ez * ez; // compare squared, defer sqrt
}
else
{
float ax = ex < 0 ? -ex : ex, ay = ey < 0 ? -ey : ey, az = ez < 0 ? -ez : ez;
dist = ax > ay ? (ax > az ? ax : az) : (ay > az ? ay : az);
}
if (dist < bestDist)
{
bestDist = dist;
p1x = qx; p1y = qy; p1z = qz;
p1nx = ncx; p1ny = ncy; p1nz = ncz;
}
}
float d1 = isL2 ? (float)System.Math.Sqrt(bestDist) : bestDist;
// Pass 2: Squared distance to nearest bisecting plane (Euclidean regardless
// of metric — linear under trilinear filtering). One sqrt at the end.
float r1x = p1x - px, r1y = p1y - py, r1z = p1z - pz;
float minEdgeSq = float.MaxValue;
for (int dz = -2; dz <= 2; dz++)
for (int dy = -2; dy <= 2; dy++)
for (int dx = -2; dx <= 2; dx++)
{
int ncx = cx0 + dx, ncy = cy0 + dy, ncz = cz0 + dz;
if (ncx == p1nx && ncy == p1ny && ncz == p1nz) continue;
int wcx = ((ncx % cellCount) + cellCount) % cellCount;
int wcy = ((ncy % cellCount) + cellCount) % cellCount;
int wcz = ((ncz % cellCount) + cellCount) % cellCount;
var pt = points[wcx + cellCount * (wcy + cellCount * wcz)];
float qx = pt.x + (ncx - wcx) * cellSize;
float qy = pt.y + (ncy - wcy) * cellSize;
float qz = pt.z + (ncz - wcz) * cellSize;
float r2x = qx - px, r2y = qy - py, r2z = qz - pz;
float ax = r2x - r1x, ay = r2y - r1y, az = r2z - r1z;
// num = dot(r1 + r2, axis), sign determines which side of the plane
float num = (r1x + r2x) * ax + (r1y + r2y) * ay + (r1z + r2z) * az;
if (num > 0f)
{
// d = num / (2 * |axis|), so d² = num² / (4 * |axis|²)
float denSq = ax * ax + ay * ay + az * az;
float dSq = num * num / (4f * denSq);
if (dSq < minEdgeSq) minEdgeSq = dSq;
}
}
int i = x + res * (y + res * z);
f1Arr[i] = d1 * rcpMaxDist;
edgeArr[i] = (float)System.Math.Sqrt(minEdgeSq) * rcpMaxDist;
}
});
f1 = f1Arr;
edgeDist = edgeArr;
}
// Convert bisecting-plane distance into [0,1]: 0.5 = on boundary, 1 = deep inside cell.
// sdfRadius controls how much distance maps to [0,1] — smaller = more precision near edges.
static void GenerateEdgeSDF(byte[] pixels, float[] edgeDist, float sdfRadius)
{
for (int i = 0; i < pixels.Length; i++)
{
float normalized = edgeDist[i] / sdfRadius * 0.5f + 0.5f;
pixels[i] = (byte)Mathf.RoundToInt(Mathf.Clamp01(normalized) * 255f);
}
}
}
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