VolumetricFog 2.0

Assets/Jbl_Shaders/Fog/FogNoiseGenerator.cs

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+using UnityEngine;
+
+[ExecuteAlways]
+public class FogNoiseGenerator : MonoBehaviour
+{
+    public Material targetMaterial;
+    public string propertyName = "_FogNoise";
+    public int size = 64;
+    public float scale = 0.05f;
+    public int seed = 1337;
+
+    void Start() { if (Application.isPlaying) Generate(); }
+
+    [ContextMenu("Generate Noise")]
+    public void Generate()
+    {
+        if (targetMaterial == null) { Debug.LogWarning("No target material set"); return; }
+        var tex = CreatePerlin3D(size, scale, seed);
+        tex.wrapMode = TextureWrapMode.Repeat;
+        tex.filterMode = FilterMode.Trilinear;
+        tex.Apply();
+        targetMaterial.SetTexture(propertyName, tex);
+        Debug.Log("Generated Texture3D and assigned to material");
+    }
+
+    static Texture3D CreatePerlin3D(int size, float scale, int seed)
+    {
+        var tex = new Texture3D(size, size, size, TextureFormat.RGBA32, false);
+        var cols = new Color[size * size * size];
+        var rng = new System.Random(seed);
+        float ox = (float)rng.NextDouble() * 10000f, oy = (float)rng.NextDouble() * 10000f, oz = (float)rng.NextDouble() * 10000f;
+        int idx = 0;
+        for (int z = 0; z < size; z++)
+        {
+            float wz = (z + oz) * scale;
+            for (int y = 0; y < size; y++)
+            {
+                float wy = (y + oy) * scale;
+                for (int x = 0; x < size; x++)
+                {
+                    float wx = (x + ox) * scale;
+                    float n = FractalPerlin(wx, wy, wz, 3);
+                    cols[idx++] = new Color(n, n, n, n);
+                }
+            }
+        }
+        tex.SetPixels(cols);
+        return tex;
+    }
+
+    static float FractalPerlin(float x, float y, float z, int octaves)
+    {
+        float amp = 1f, freq = 1f, sum = 0f, max = 0f;
+        for (int i = 0; i < octaves; i++)
+        {
+            sum += amp * Mathf.PerlinNoise(x * freq, y * freq);
+            sum += amp * Mathf.PerlinNoise(y * freq, z * freq);
+            sum += amp * Mathf.PerlinNoise(z * freq, x * freq);
+            max += 3f * amp;
+            amp *= 0.5f;
+            freq *= 2f;
+        }
+        return Mathf.Clamp01(sum / max);
+    }
+}