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Runtime/Cloner/Distribution/GridDistribution.cs

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+using Unity.Mathematics;
+
+namespace Misaki.ArtTool
+{
+    public static partial class Distribution
+    {
+        public static void GridDistribution(int index, GridDistributionSetting setting, out float4x4 localMatrix, out bool isValid)
+        {
+            var random = Random.CreateFromIndex((uint)index);
+
+            var localPosition = GetCubePosition(index, setting.count) * setting.spacing;
+
+            switch (setting.shape)
+            {
+                case GridShape.Cube:
+                    isValid = true;
+                    break;
+
+                case GridShape.Sphere:
+                    var isInsideSphere = ShapeHelper.IsInsideSphere(localPosition, 0.0f, setting.count * setting.spacing);
+
+                    isValid = isInsideSphere;
+                    break;
+
+                case GridShape.Cylinder:
+                    var isInsideCylinder = ShapeHelper.IsInsideCylinder(localPosition, 0.0f, setting.count * setting.spacing);
+                    isValid = isInsideCylinder;
+                    break;
+                default:
+                    isValid = false;
+                    break;
+            }
+
+            if (random.NextFloat() > setting.fill && isValid == true)
+            {
+                isValid = false;
+            }
+
+            localMatrix = float4x4.TRS(localPosition, quaternion.identity, new float3(1.0f));
+        }
+
+        private static float3 GetCubePosition(int index, int3 size)
+        {
+            float3 localPosition;
+            var yIndex = index / (size.x * size.z);
+            var remain = index % (size.x * size.z);
+            var zIndex = remain / size.x;
+            var xIndex = remain % size.x;
+
+            localPosition = new float3(xIndex, yIndex, zIndex);
+            localPosition -= (float3)(size - 1) * 0.5f;
+            return localPosition;
+        }
+    }
+}