Minecraft 26.3 Snapshot 3 `/posteffect` Guide

Minecraft 26.3 Snapshot 3 introduced /posteffect , a command for adding and removing post-processing effects on players. Post effects are applied to the player's screen after normal rendering finishes.

Minecraft 26.3 Snapshot 3 /posteffect Guide

Minecraft 26.3 Snapshot 3 introduced /posteffect, a command for adding and removing post-processing effects on players. Post effects are applied to the player's screen after normal rendering finishes.

Client-side behavior

Post effects come from resource packs on the client, not from the server. The server therefore cannot determine whether a requested effect is available or actually appears on the player's screen. Verify both the command-managed state and the visible result on the targeted client.

Snapshot 3 uses resource-pack version 91.0.

Command syntax

Add an effect if it is not already present:

/posteffect add <player> <posteffect>

Example:

/posteffect add @s demo:cinematic_blue

List the effects applied to a player:

/posteffect list <target>

Example:

/posteffect list @s

Remove one effect if it is present:

/posteffect remove <player> <posteffect>

Example:

/posteffect remove @s demo:cinematic_blue

Remove all command-managed post effects from a player:

/posteffect clear <player>

Example:

/posteffect clear @s

Resource-pack format warning

Do not rely on the draft's extra shader-program JSON file under shaders/post. Official Minecraft 1.21.5 notes state that JSON shader-program definitions for post-processing effects were removed. Post-effect JSON definitions instead use vertex_shader and fragment_shader; a namespaced shader ID resolves beneath assets/<namespace>/shaders/ with the corresponding .vsh or .fsh extension.

Mojang also warns that shaders can change and that /posteffect, post effects, or shaders may be redesigned. Treat Snapshot 3 packs as experimental and record the exact version used for testing.

Always-on effects

A resource pack can define minecraft:end_of_frame. Minecraft applies this effect before other post effects, including effects enabled through /posteffect. It remains active while the pack is loaded and cannot be controlled with /posteffect, so neither remove nor clear disables it.

If multiple enabled packs define minecraft:end_of_frame, the definition from the last resource pack in the player's pack list is used.

Safe testing

Snapshots can be enabled in the Minecraft Launcher's Installations tab. Mojang warns that testing versions can corrupt worlds and recommends making backups or running them in a folder separate from normal worlds.

For related reporting, follow sourced Minecraft coverage on TOP OF GAMES, while using Mojang's snapshot notes as the implementation reference.