Generated new code and added initial data handling

BlendFile/DNA/FluidVertexVelocity.cs

@@ -17,6 +17,9 @@ namespace BlendFile.DNA {
     public struct FluidVertexVelocity {
         [DNAFieldAttribute(0, "float", "vel[3]", 4)]
         public float[] vel = new System.Single[3];
+        public FluidVertexVelocity() {
+            this.vel = default;
+        }
         public FluidVertexVelocity(float[] vel) {
             this.vel = vel;
         }