Issue?+Suggestion: Inability to Achieve Transparency Animation with Glowing Eyes Effect in Version 1.21.3.

Normal Functionality in older version

To make the light effect (Glowing Eyes) fade to transparency, you typically set the color to black, while white will make it visible.

Advantages

This method allows for creating animations that fade the light in or out, revealing the texture behind.

Disadvantages

The downside is that the colors can become distorted. Even when set to pure white, the effect remains somewhat transparent.
It’s necessary to use a black background texture or adjust the white light effect's color filter to prevent excessive color distortion.

Current Issue in Version 1.21.3

In version 1.21.3, it seems there is either a bug or a recent change in the lighting system :

You can no longer make the effect transparent.
When the "Color filter" with "Glowing Eyes" is set to black, it turns completely black and is no longer transparent.
Setting it to white does not cause color distortion, as it is not transparent at all.

This change can be seen as a solution to the color distortion in transparency, but it raises the question: what if you want the effect to be transparent?

left 1.21.1 And right 1.21.3 (both are CPM 0.16.19a)

https://github.com/user-attachments/assets/e5806875-e304-462c-b195-b3a58952c4fc

File model : TestGlowColorSetBlackto0.zip

Suggestion

I propose adding an "Alpha Color" or "Alpha Channel" in the "Color filter" bar for lights. This would ensure that colors remain unaffected when creating transparent light animations.

Impact on Older Models

Currently, older models that used this transparency technique have turned into solid black or non-transparent versions. This affects:

Effects resembling outlines of models
Barrier armor effects
Clear glass effects

1.21.1

1.21.3 no more halloween glow effect. XD *not my model

Summary

I appreciate the new lighting system (Glowing Eyes). I'm uncertain if the lack of transparency is a bug or a fix, but it effectively prevents color distortion, which is a benefit. However, I would still like to retain the ability to create transparent light effects. Adding an "Alpha" thing in the "Color filter" specifically for animations would be ideal.

More info - Tested with

Minecraft version 1.21.3 on both Fabric and Forge
No other mods on 1.21.3
CPM 0.16.19a
AMD RX570 graphics card

tom5454 / CustomPlayerModels