Update 26.04.08

A new update has been released, you can view the full changes on our blog post.

https://sbox.game/news/update-26-04-08

Here's some highlights from the blog.

New Games Menu

Sandbox: Open Source

The Sandbox game itself is now open-source, people can contribute or take the code for their own games.

Sandbox: Emitters

Sandbox: Achievements

Changelog

🎁 Added

• Doo, a simpler visual scripting system for wiring up component events — designed as a friendlier alternative to ActionGraph for common use cases

• Mesh cable tool in the mesh editor for creating cables, working similarly to Hammer

• New games dashboard with a rotating carousel and redesigned game cards

• `lang.showkeys` cvar and editor toggle to display localisation keys instead of translated text for debugging

• CSS `overflow: clip` and `overflow: clip-whole` properties for UI element clipping

• CSS `background-playback-state` property to pause video backgrounds

• `[ShowIf]` and `[HideIf]` attributes now support null checks

• Center option added to the pivot list in mapping tools

• `IFormattable` whitelisted for use in the sandbox. Thank you @RumBugen!

🧼 Improved

• CosmeticTexture editor moved into the inspector/Thank you @boxrocket6803!

• Cascaded shadow map exclusion culling — shadows no longer render beyond each cascade boundary and objects from previous cascades are no longer re-rendered, significantly improving shadow performance

• Networking thread now processes messages at the same tick rate as the main thread

• Particle sprite GPU upload performance — buffer uploads moved into valid Graphics.Scope to avoid unnecessary render context creation

• Network packet byte arrays are now pooled in DecodeStream, reducing GC pressure for large compressed payloads

• Fixed a Steam buffer GCHandle leak where N-1 handles would leak per broadcast packet; replaced with a cheaper memcpy approach

• `Package.MountAsync` now supports mounting specific package revisions, allowing games to pin map versions

• `LoadingScreen.IsVisible` is no longer overridden every frame, allowing games to manually control loading screen visibility

• `Game.ChangeScene` now shows a loading screen for all clients instead of just the host

• Engine overlays remain visible during loading states

• ScreenPanel `Scale` property now works when Auto Scale is enabled, and `Opacity` now correctly affects ScreenPanels

• Undo support for WrapTextureToSelection and WrapTexture operations in the mapping tools

• Pause modal now uses the lighter HtmlPanel instead of a full WebPanel

• Launcher window geometry is saved when auto-closing

• PATH changes are now a no-op on non-Windows platforms. Thank you @MrSoup678!

🪛 Fixed

• Disabling shadows on a directional light now works correctly

• Shader compiler shutdown crashes resolved by properly draining the material system and preventing Steam callbacks after managed shutdown

• Exceeding the maximum light count no longer triggers assertions or causes directional light flickering

• `GetPixels` arguments are now validated to prevent negative values, fixing a security vulnerability

• Referencing a deleted prefab no longer crashes — the editor shows a warning and preserves instance data for recovery

• Creating a prefab from a GameObject now correctly restores the object's position

• Reverting changes on a nested prefab instance no longer wipes all outermost overrides

• Applying changes to a nested prefab no longer regenerates all GUIDs

• Fixed cyclical library references caused by built-in projects referencing libraries

• Fixed a null `AssetTypeAttribute.Name` NRE that silently shut down the GameInstance on editor startup

• Game loading is now properly cancelled on disconnect, preventing background loads from continuing

• Fixed filesystem unmount exceptions when a load is cancelled

• Prop gibs now properly inherit velocity when spawned in a batch group

• `IgnoreSingleObject` trace now correctly checks both rigidbody and collider GameObjects

• Glass shader tint now blends correctly through multiple layers using premultiplied alpha blending. Thank you @Infiland!

• `backdrop-filter: blur` no longer generates excessive mipmap levels Thank you @Infiland!

• Toast notifications (e.g. achievements) no longer