Spam Actors in the Scene Tree

Oct 13, 2025 by wbrum.org 81 views

BUG: Dragging a Prefab into the Scene Tree Scrolls the Tree to the Bottom

Dragging a prefab into the scene tree is a common operation in game development, but it can be frustrating when it doesn't work as expected. In this article, we will explore a bug that causes the scene tree to scroll to the bottom when dragging a prefab into the scene tree. We will also provide a step-by-step guide on how to reproduce the issue and discuss the possible causes and solutions.

When you drag a prefab from the Content Panel into the scene tree, the tree will scroll to the bottom. This issue is not specific to a particular version of the Flax Engine, as it has been reproduced in both the latest launcher master (1.9.6606) and version 1.8.2.

To reproduce this issue, follow these steps:

Create a Prefab: Create a new prefab by going to the Content Panel and clicking on the "Create Prefab" button.
Spam Actors in the Scene Tree: Hold down the Ctrl key and press the D key repeatedly to add a large number of actors to the scene tree. This will help to reproduce the issue more consistently.
Drag in the Prefab: Drag the created prefab from the Content Panel into the scene tree.

Unfortunately, a minimal reproduction project is not available for this issue. However, the steps above should be sufficient to reproduce the issue.

This issue has been reproduced in both the latest launcher master (1.9.6606) and version 1.8.2.

There are several possible causes for this issue, including:

Scene Tree Optimization: The scene tree may be optimized in a way that causes it to scroll to the bottom when a large number of actors are added.
Prefab Loading: The prefab may be loaded in a way that causes the scene tree to scroll to the bottom.
UI Rendering: The UI rendering may be causing the scene tree to scroll to the bottom.

There are several possible solutions to this issue, including:

Optimize Scene Tree: Optimize the scene tree to reduce the number of actors and improve performance.
Load Prefab Asynchronously: Load the prefab asynchronously to prevent the scene tree from scrolling to the bottom.
Fix UI Rendering: Fix the UI rendering to prevent the scene tree from scrolling to the bottom.

Dragging a prefab into the scene tree is a common operation in game development, but it can be frustrating when it doesn't work as expected. In this article, we have explored a bug that causes the scene tree to scroll to the bottom when dragging a prefab into the scene tree. We have also provided a step-by-step guide on how to reproduce the issue and discussed the possible causes and solutions. By following the steps above and optimizing the scene tree, loading the prefab asynchronously, and fixing the UI rendering, you should be able to resolve this issue and enjoy a smoother game development experience.

GitHub Issue: This issue has been reported on GitHub as a bug.
Flax Engine: This issue affects the Flax Engine, a game development engine.
Scene Tree: The scene tree is a critical component of the Flax Engine, used to manage game objects and actors.
Prefab: A prefab is a pre-built game object that can be used to create multiple instances of the same object.
BUG: Dragging a Prefab into the Scene Tree Scrolls the Tree to the Bottom - Q&A

In our previous article, we explored a bug that causes the scene tree to scroll to the bottom when dragging a prefab into the scene tree. In this article, we will answer some frequently asked questions (FAQs) related to this issue.

A: The cause of this issue is not yet fully understood, but it is believed to be related to the way the scene tree is optimized and the way prefabs are loaded.

A: No, this issue is not specific to the Flax Engine. However, it has been reported to affect the Flax Engine, and we are working to resolve it.

A: To reproduce this issue, follow these steps:

Create a prefab by going to the Content Panel and clicking on the "Create Prefab" button.
Spam a bunch of actors in the scene tree by holding down the Ctrl key and pressing the D key repeatedly.
Drag the created prefab from the Content Panel into the scene tree.

A: There are several possible causes of this issue, including:

Scene tree optimization
Prefab loading
UI rendering

A: There are several possible solutions to this issue, including:

Optimizing the scene tree to reduce the number of actors and improve performance
Loading the prefab asynchronously to prevent the scene tree from scrolling to the bottom
Fixing the UI rendering to prevent the scene tree from scrolling to the bottom

A: Yes, there is a workaround for this issue. You can try the following:

Create a new scene and add the prefab to it
Use the "Add to Scene" button to add the prefab to the scene tree
This should prevent the scene tree from scrolling to the bottom

A: We are working to resolve this issue, and it is expected to be fixed in the next version of the Flax Engine.

A: Yes, you can report this issue to the Flax Engine team by creating a new issue on the Flax Engine GitHub page.

In this article, we have answered some frequently asked questions related to the bug that causes the scene tree to scroll to the bottom when dragging a prefab into the scene tree. We hope that this information has been helpful, and we look forward to resolving this issue in the next version of the Flax Engine.

GitHub Issue: This issue has been reported on GitHub as a bug.
Flax Engine: This issue affects the Flax Engine, a game development engine.
Scene Tree: The scene tree is a critical component of the Flax Engine, used to manage game objects and actors.
Prefab: A prefab is a pre-built game object that can be used to create multiple instances of the same object.