Godot Version 4.5.1 Question I have been trying to access a screen texture where the game is visible to implement a custom CRT shader. To test whether I can access it from a ping-pong buffer, I simply try to output a screen texture as COLOR, which doesn’t work and displays a pitch black screen. Wh…

You need to share the World2D resource between the root SubViewport and all other SubViewport nodes. Explained here: Worlds - Using Viewports Introduction: Think of a Viewport as a screen onto which the game is projected. In order to see the game, we need to have a surface on which to…

At the script attached to the Game node, I have added these statements in func _ready(): buffer_a.world_2d = get_world_2d() buffer_b.world_2d = get_world_2d() However, it returns this error in a debugger, which doesn’t appear when these lines don’t exist/are commented out. E 0:00:01:162 draw_…

I’m not sure it’ll work but Can you try this instead? buffer_a.world_2d = get_tree().current_scene.get_viewport().world_2d buffer_b.world_2d = get_tree().current_scene.get_viewport().world_2d

Unfortunately, I get the same error when using these lines of code. E 0:00:01:667 draw_list_bind_uniform_set: Attempted to use the same texture in framebuffer attachment and a uniform (set: 3, binding: 0), this is not allowed. <C++ Error> Condition "attachable_ptr[i].texture == bound_ptr[j]" …

I just found this. I think it’s the same error you are getting. It’s worth to check it. Attempted to use the same texture in framebuffer attachment error opened 10:17PM - 17 Dec 20 UTC (UTC) closed 08:34AM - 04 J…

I have found another instance of the problem: Error message when sharing a world_2d between Viewports opened 01:34PM - 17 Dec 22 UTC (UTC) [image] michasng …

I think sharing the world has nothing to do with screen texture. Afaik the main screen texture cannot be attained from within sub viewports. Likely because sub viewport are drawn before the main viewport.

[image] cyberhead: Am I missing something or doesn’t documentation make it clear on how I can get a game screen texture in the main viewport? You’re definitely overcomplicating things. You certainly do not need to be doing your own texture buffering. You also do not need to use a SubViewport …

I want to implement a phosphor decay effect like it’s visible on this video, and that’s why I decided to use the ping-pong buffer to implement it. [Lyle Bickley explains the PDP-1 (and we play the original Spacewar!)] In this case, it makes sense to make my own texture buffering.

[image] cyberhead: I want to implement a phosphor decay effect like it’s visible on this video, and that’s why I decided to use the ping-pong buffer to implement it. You could do that with a tween and modulate the alpha value. var tween: Tween = create_tween() tween.tween_property(self, "mod…

Accessing a screen texture from a SubViewport

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normalized February 10, 2026, 5:10pm 15

There was a thread recently about accumulating using a sub viewport: