# Instance Transform

`FloraInstanceTransform` is a lightweight struct used to represent an instance’s **position**, **rotation**, and **scale**—either relative to a parent (`local space`) or in world space when no parent is assigned.

Its design and API are based on Unity’s [`LocalTransform`](https://docs.unity3d.com/Packages/com.unity.entities@1.0/api/Unity.Transforms.LocalTransform.html) from the Entities package.

***

### Usage

#### Defining an Instance Transform

Instances can be placed using local-space transform data relative to a parent `Transform`:

```csharp
var localTransform = new FloraInstanceTransform(localPosition, localRotation, localScale);
FloraSystem.Instance.CreateInstance(prefab, this.transform, localTransform);
```

#### Converting from a Unity Transform

You can construct a `FloraInstanceTransform` from a `Transform`, in either local or world space:

```csharp
var local = FloraInstanceTransform.FromUnityTransform(this.transform, Space.Self);
var world = FloraInstanceTransform.FromUnityTransform(this.transform, Space.World);
```

#### Writing Instance Transforms

To update an instance’s transform after creation:

```csharp
FloraSystem.Instance.UpdateInstanceWorldTransform(handle, transform);
```

You can also update multiple instances at once using arrays or native containers.

#### Transform Composition and Manipulation

`FloraInstanceTransform` includes utility methods for manipulating transform data:

```csharp
transform = transform.RotateY(math.radians(90)).Translate(new float3(0, 1, 0));
```


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