Persistent warn when assigning Viewport Texture to Light Projector Texture

Help Programming
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1

Godot 4.4

I have a 3d scene in which I have a mesh of an old cabinet CRT TV. This TV has a screen with a Viewport Texture assigned to it, and within that SubViewport is a variety of 2d elements. However in order to simulate the variable light of an actual TV being cast into the room I have a second SubViewport with identical 2d elements and a blur shader, which I have assigned to a Spotlight3D. This only works by running this function continually through the _process function:

func light_reset():
	light_projector.light_projector = null
	light_projector.light_projector = $"TV Light".get_texture()

This works great and isnt a performance problem or anything, however, I then receive this warning EVERY FRAME:

“ViewportTexture cannot be used as a Light3D projector texture (). As a workaround, assign the value returned by ViewportTexture’s get_image() instead”.

Provided I’m applying this change correctly (which I assume is the case as it doesn’t throw errors of any kind) the projector no longer works, if I try to ignore the warning, I cannot due to it not having a specified type (as far as I can tell). This is obviously very obnoxious, I do fully understand that according to the docs this workaround I am using is specifically not supported hence the warning, but I am simply unwilling to let it go and it literally still functions, I should at least be able to ignore the warning.

If I am leaving out any relevant code, Images, or other information that may help you help me please let me know. Thank you for reading!

2

You’ll need to use an ImageTexture for your light_projector and set the viewport’s texture Image to it whenever you want to update it with ImageTexture.set_image()

extends Node

@onready var spot_light_3d: SpotLight3D = $SpotLight3D
@onready var sub_viewport: SubViewport = $SubViewport

var projector_texture:ImageTexture

func _ready() -> void:
	var image = sub_viewport.get_texture().get_image()
	projector_texture = ImageTexture.create_from_image(image)
	spot_light_3d.light_projector = projector_texture


func _process(delta: float) -> void:
	if not projector_texture:
		return
	var image = sub_viewport.get_texture().get_image()
	projector_texture.set_image(image)

Result:

3

THANK YOU SO MUCH! I see now that it was not simply asking me to tack something onto my existing code. this works perfectly.