> For the complete documentation index, see [llms.txt](https://docs.flatredball.com/gum/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flatredball.com/gum/code/standard-visuals/spriteruntime/rendertargettexturesource.md).

# RenderTargetTextureSource

## Introduction

The RenderTargetTextureSource property allows a Sprite to render a texture produced by a different ContainerRuntime which is drawing to a render target. This feature allows a render target to be scaled, rotated, positioned, stacked, or to use any other Gum layout functionality.

{% hint style="info" %}
To set up this same pattern in the Gum tool, see [Rotating and Scaling Clipped Contents](/gum/gum-tool/tutorials-and-examples/examples/rotating-and-scaling-clipped-contents.md).
{% endhint %}

## RenderTargetTextureSource Requirements

To use RenderTargetTextureSource, the following must exist:

1. A container which has its IsRenderTarget set to true. This container can contain any number of children.
2. A Sprite which has its RenderTargetTextureSource set to the container

{% hint style="info" %}
Normally invisible objects are not rendered and do not perform their Layout calls. If a container has its IsRenderTarget set to true, then it will perform layout and rendering calls so even if invisible so that SpriteRuntime instances can reference the resulting texture.
{% endhint %}

## Code Example: Scaling a ListBox

The following code creates a ListBox which is displayed on a render target with wavy scaling:

```csharp
SpriteRuntime sprite;

protected override void Initialize()
{
    GumUI.Initialize(this);

    var container = new ContainerRuntime();
    container.AddToRoot();
    container.Name = "Render target container";
    container.IsRenderTarget = true;
    container.Dock(Dock.SizeToChildren);
    container.Visible = false;

    var listBox = new ListBox();
    container.AddChild(listBox);
    for (int i = 0; i < 20; i++)
    {
        listBox.Items.Add($"Item {i}");
    }

    sprite = new SpriteRuntime();
    sprite.AddToRoot();
    sprite.Anchor(Anchor.Center);
    sprite.RenderTargetTextureSource = container;

    base.Initialize();
}

protected override void Update(GameTime gameTime)
{
    var gameSeconds = (float)gameTime.TotalGameTime.TotalSeconds;
    sprite.Width = 100 + 50 * MathF.Sin(gameSeconds * 4);
    sprite.Height = 100 + 50 * MathF.Sin(gameSeconds * 3);

    GumUI.Update(gameTime);

    base.Update(gameTime);
}

```

<figure><img src="https://2695663588-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M_fzQmxQ1VeUFHcoo2c%2Fuploads%2Fgit-blob-5d8dd59bfe6e443f1b8065577e136a10b16ddac8%2F11_05%2056%2052.gif?alt=media" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
Currently the ListBox is not interactive because the original ListBox is invisible so it does not receive events from the Cursor. Future versions of Gum may provide a way to interact with invisible controls rendered to a RenderTarget.

This limitation applies to Gum's own `IsRenderTarget` baking. If you instead draw a subtree into a `RenderTarget2D` yourself (for example with `GumBatch`), you can keep it interactive by mapping the cursor with [`HitTestTransformMatrix`](/gum/code/events-and-interactivity/mouse-and-touch-screen-cursor.md#several-coordinate-spaces-at-once-hittesttransformmatrix).
{% endhint %}

If you are managing a render target yourself instead of using `IsRenderTarget`, see [Render Targets](/gum/code/rendering/render-targets.md) for the blend-mode setup needed to composite translucent content correctly on MonoGame and raylib.


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