AuraBlob

aura_demo.mp4

Animated aura blob shader for Unity UI Toolkit (URP). Renders a living, iridescent blob with inner layers, edge glow, and star particles — designed to sit behind UI cards as a relationship/status indicator.

Shader — Custom/AuraBlob

Renders via Graphics.Blit into a RenderTexture used as a background-image on a UIToolkit VisualElement.

Key properties

Property	Description	Range
_BaseHue	Primary color hue	0–1
_IridShift	Iridescence spread from base hue	0–1
_Saturation / _Brightness	Color intensity	—
_BlobPadding	Inset of blob edge from RT bounds	0–0.45
_CornerRadius	Roundness of blob shape	0–0.5
_EdgeAmp / _EdgeFreq	Organic wobble amplitude and frequency	—
_EdgeGlow	Outer glow intensity	0–1
_Speed / _IridSpeed	Animation speeds	0–3
_LayerCount	Number of inner concentric layers	0–6
_LayerVisibility	Opacity of inner layers	0–0.4
_StarDensity / _StarBrightness	Particle field density and brightness	—
_InnerCut	Cuts a hole in the center (1 = full blob, 0 = ring)	0–1
_AspectRatio	Must be set to width / height each frame	Float
_Alpha	Overall opacity multiplier — used for layer blending	0–1

AuraCard

AuraCard : VisualElement — wraps the shader lifecycle. Drop into a UXML or create in code.

var card = new AuraCard();
card.AddToClassList("ac-aura-card");
container.Add(card);
card.Initialize(auraMaterial, blobPadding: 0.12f);
card.SetGlow(primaryColor, secondaryColor, intensity: 0.6f);
card.SetLayerAlpha(0.8f);

Initialize copies the material, sets shader defaults, and starts the 16ms blit loop on GeometryChangedEvent. The RT is re-created automatically when the element is resized. Scale is 3× CSS size with antiAliasing = 4 for sharp rendering.

AuraCustomizer demo

AuraCustomizerController + AuraCustomizerUI.uxml — interactive demo scene.

• Up to 4 stacked layers, each with independent color and intensity
• Each layer gets a different _BlobPadding (0.14 → 0.05) so they nest visually
• 12 color presets, per-layer intensity slider, scrollable controls panel

Setup

1. Assign AuraMaterial (using Custom/AuraBlob) to AuraCustomizerController in the Inspector
2. The UIDocument on the same GameObject should reference AuraCustomizerUI.uxml
3. Hit Play — first layer initializes automatically