Fix crash when creating Empty particle emitter

Fixes #174

Source/Editor/Surface/Archetypes/Particles.cs

@@ -338,7 +338,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Size = new Vector2(300, 600),
                 DefaultValues = new object[]
                 {
-                    500, // Capacity
+                    1000, // Capacity
                     (int)ParticlesSimulationMode.Default, // Simulation Mode
                     (int)ParticlesSimulationSpace.Local, // Simulation Space
                     true, // Enable Pooling

Source/Engine/Serialization/Stream.cpp

@@ -602,13 +602,21 @@ void WriteStream::WriteVariant(const Variant& data)
         break;
     case VariantType::Structure:
     case VariantType::Blob:
-    case VariantType::BoundingBox:
-    case VariantType::Transform:
-    case VariantType::Ray:
-    case VariantType::Matrix:
         WriteInt32(data.AsBlob.Length);
         WriteBytes(data.AsBlob.Data, data.AsBlob.Length);
         break;
+    case VariantType::BoundingBox:
+        WriteBytes(data.AsBlob.Data, sizeof(BoundingBox));
+        break;
+    case VariantType::Transform:
+        WriteBytes(data.AsBlob.Data, sizeof(Transform));
+        break;
+    case VariantType::Ray:
+        WriteBytes(data.AsBlob.Data, sizeof(Ray));
+        break;
+    case VariantType::Matrix:
+        WriteBytes(data.AsBlob.Data, sizeof(Matrix));
+        break;
     case VariantType::Asset:
         id = data.AsAsset ? data.AsAsset->GetID() : Guid::Empty;
         Write(&id);