RainbowGear

Fully refined gear gets a green halo. RainbowGear turns that halo into a slowly cycling, white-tinted rainbow and recolours the weapon's own blade trail — without changing the glow's size, density or the weapon model itself.

How it works

Runtime inspection of an item shows the glow is three things:

UpgraderGlow:  ParticleIntensityScaler
Particle System:  ParticleSystemRenderer  [DraugrFangGlow material (_EmissionColor, _EmissionMap)]
Point light:      Light, LightLod
trail:            MeleeWeaponTrail

The halo's colour lives in the particle material's _EmissionColor, not in the particle start colour. Writing the start colour only tints it slightly and can wash it out to white fog.
The blade trail is a MeleeWeaponTrail with baked vertex colours.

The plugin therefore:

writes _EmissionColor (and _Color) on each ParticleSystemRenderer material of the equipped model — the emission is the halo;
recolours the point light;
replaces the RGB of the built-in MeleeWeaponTrail's vertex colours, keeping its alpha falloff.

It does not resize, thin out or add anything, so the look stays vanilla apart from the hue.

Config

BepInEx/config/snowfarm.valheim.rainbowgear.cfg

Section	Key	Default	Meaning
1 - General	`Enabled`	`true`	Master switch
1 - General	`MinQuality`	`26`	Minimum item quality (26 = above level 25)
2 - Rainbow	`CycleSpeed`	`1.0`	Full hue cycles per second
2 - Rainbow	`Saturation`	`0.5`	`0` = white, `1` = vivid rainbow
2 - Rainbow	`GlowBrightness`	`1.0`	Emission multiplier; `1` keeps the vanilla intensity

Tuning:

halo still too strong → GlowBrightness 0.6
want it brighter → GlowBrightness 1.5
more colour, less white → Saturation 0.7–0.9
faster cycle → CycleSpeed 2

Why quality 26 is a real number

In Valheim 1.0 the Forge of Potential in the Mountains reforges an item with an idol: 65% chance to raise its quality by one level and no maximum level. Quality values above the old cap of 4/5 are normal on refined gear, and 26 simply means "anything refined past 25".

Notes

Client-side and visual only; nothing is sent to the server or saved.
Materials are accessed per instance (Renderer.material), so shared assets are never modified.

中文说明

满级/高强化装备外面那圈绿光，其实由三部分组成：粒子（材质 DraugrFangGlow 的 _EmissionColor 决定颜色）、点光源、以及武器自带的 MeleeWeaponTrail 刀光。

这个 mod 只做换色，不改尺寸、不改浓度、也不额外加拖尾：

逐帧写粒子材质的 _EmissionColor / _Color；
改点光源颜色；
把自带 MeleeWeaponTrail 的顶点颜色 RGB 换掉、保留原本的透明度衰减。

所以外观和原版一致，只是绿光变成会流转的、偏白的彩虹。想更淡把 GlowBrightness 调到 0.6，想更彩把 Saturation 调到 0.8。

Build

dotnet build -c Release -p:ValheimDir="C:\Program Files (x86)\Steam\steamapps\common\Valheim"

or run pack.ps1 to build and produce RainbowGear.zip for Thunderstore.

Details