Available on Asset Store: https://assetstore.unity.com/packages/tools/gui/runtime-scene-gizmo-123040

Forum Thread: https://forum.unity.com/threads/runtime-scene-gizmo-for-ugui-open-source.540011/

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This plugin helps you display a runtime scene gizmo as a UI element in your Unity projects. An event is raised when a component of the gizmo is clicked.

There are 5 ways to install this plugin:

• import RuntimeSceneGizmo.unitypackage via Assets-Import Package
• clone/download this repository and move the Plugins folder to your Unity project's Assets folder
• import it from Asset Store
• (via Package Manager) add the following line to Packages/manifest.json:
  • "com.yasirkula.runtimescenegizmo": "https://github.com/yasirkula/UnityRuntimeSceneGizmo.git",
• (via OpenUPM) after installing openupm-cli, run the following command:
  • openupm add com.yasirkula.runtimescenegizmo

Simply add Plugins/RuntimeSceneGizmo/Prefabs/GizmoRenderer to your UI canvas and position it as you like. Gizmo will always have 1:1 aspect ratio and, by default, will be placed at the top-right corner of GizmoRenderer. You can change the RenderTarget child object's pivot for a different placement.

To invoke a function when a gizmo component is clicked, use the On Component Clicked event of the GizmoRenderer object. Functions registered to this event should ideally take a GizmoComponent parameter (which is defined in RuntimeSceneGizmo namespace).

Gizmo's rotation will match the main camera's rotation but it is possible to change the reference object via GizmoRenderer's Reference Transform property.

GizmoRenderer will automatically create an instance of SceneGizmo prefab in your scene. SceneGizmo uses a camera to render the gizmo to a RenderTexture, which is then used by the GizmoRenderer to display the gizmo on the canvas. By default, SceneGizmo objects use layer 24 but this can be adjusted via SceneGizmoController.GIZMOS_LAYER constant.

See Plugins/RuntimeSceneGizmo/Demo/DemoScene for an example scene.