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Subject: Godot version: changing intensity resets material parameters

Hi, I found an issue with the Godot version of your VFX pack. This report concerns the Godot version, not the Three.js version.

I’m using Godot 4.7.2, Forward+.

In an inherited scene based on Slash_fire.tscn, I changed the effect’s intensity from 1.0 to 0.8 and saved it. The ember particles became almost invisible. Changing intensity back to 1.0 did not restore their appearance.

After investigating, I found that:

• The shaders declare tint, color1, and color2 as plain vec4 uniforms, but the scene files store these parameters as Color.
• Changing intensity calls _apply_instance(), which duplicates the ShaderMaterials.
• In a minimal reproduction on Godot 4.7.2, duplicating a material with a Color value for a plain vec4 uniform resets that parameter to its shader default. It also changes the value on the original material.
• For example, the ember material’s tint changes from Color(16.3869, 16.3869, 16.3869, 0.00392157) to Vector4(1, 1, 1, 1).
• Storing the same values as Vector4 instead preserves them during duplication and saving.

Restoring the original values and storing them as Vector4 fixed the issue. I verified repeated intensity changes between 0.8 and 1.0, material duplication, and saving/reloading.

The same Color parameter format appears in many other Godot scenes in the pack, so this may affect other effects as well.

Could you please check this compatibility issue? Thank you!