Overview

Key features

• Per-object passes — outer rim, X-Ray rim for when the object is hidden, interior fill, and X-Ray interior fill, plus an optional cutout overlay on meshes. Each carries its own complete profile.
• Fifteen outline styles, every one of them tunable: Solid, Neon, Halo, Sketch, Pattern, Double, Electric, Rainbow, Gradient, Frost, Lava, Smoke, Crystal, Water, Fire.
• Sprites are first-class: Keyline Outline 2D gives a SpriteRenderer the same profiles, styles and passes, with the rim measured from a distance field baked out of the artwork rather than from an extruded hull — so it follows what is drawn, holes included. Sprite Atlas and per-frame fields for animation clips are supported.
• Pixel art is a first-class case: the sprite's distance field can be baked on the texel grid instead, so the edge lands on texel boundaries, corners come out square, and the width is counted in whole texels of the source — two texels of outline at any zoom and any Pixels Per Unit.
• X-Ray layer filtering: each component names the Unity layers its X-Ray may show through — glass only, walls only, both — and two objects behind the same wall can disagree. Costs nothing until a mask is actually narrowed.
• Seven blend modes plus Default, per pass — Alpha, Additive, Multiply, Screen, Lighten, Darken, Subtract — so the same colour can be laid over the frame as light, as ink, or as ordinary transparency.
• Single Layer: where a hull folds over itself, paint the pixel once instead of twice — for the styles where the overlap is a defect, not the look.
• Adjustable edge softness on every style and every pass, with a stepped ring-by-ring falloff for pixel art. On meshes it rides on the optional Soft Edge pass, added and removed in one click; without it the component behaves exactly as before, hard-edged and with nothing to install.
• Hard-mesh handling — Mixed expand decides per face which rule applies, Sheet Solidify thickens flat islands enough to hold a rim.
• Cutout from material alpha: the outline follows the shape the texture defines, not the one the mesh has, with double-sided rendering for every style and pass. Foliage cards, decals, sprites on quads.
• Uniform scale handling: stretch the model and the outline and its style keep their proportions instead of stretching with it.
• Merge groups draw several objects as one silhouette, explicitly or automatically, with no internal edges between them — and X-Ray unions across the group the same way.
• Skinned meshes follow the animation without re-baking per frame — all passes, on a rigged character.
• Width in world units, in constant screen pixels, or in texels of the source sprite, whichever the shot needs.
• Draw Config exposes queue, ZTest, ZWrite, Cull, depth bias and stencil state per object instead of keeping them as constants.
• Thirteen drop-in components for hover, selection, damage, gauges, waves and reveal — plus an arbiter that stops them fighting over the same object.
• Instance override: profiles are shared by default, and an object forks its own private copy the moment it needs to differ.
• Full scripting API, documented section by section in the manual.

Outline styles

Solida clean, quiet rim. The one that fits realistic scenes without asking for attention.

Neonan additive glow with its own shell, for sci-fi and night scenes.

Haloa soft layered bloom around the silhouette, tunable down to a whisper.

Sketcha restless, sketchy line that keeps moving, for stylised and toon looks.

Pattern84 tileable textures projected onto the rim, with scale, contrast and scroll.

Doubletwo concentric rings with a real gap between them, held open by a mask.

Electrica flickering bolt that reads as energy rather than as a line.

Rainbowa hue sweep travelling vertically or around a centre, with its own saturation control.

Gradienttwo colours with independent alphas; the style everything else is built on — the waves, the gauges and the reveal all drive a Gradient underneath.

Frosta sparkling shell with soft falloff, for ice, shields and status effects.

Lavaa dark crust broken open on a moving core, lit from inside the cracks rather than by being orange.

Smokea billowing cloud that runs out along its drift instead of ending at an edge.

Crystala cut stone: flat facets each catching the light on their own, bright cut edges and dispersion between neighbours.

Watera surface flowing around the object, with caustics and sheen that brighten towards the crest and stop there.

Firetongues rising off the silhouette, stretched along the rise and dying at a height you set.

What's included

• Two outline shaders — Keyline/Outline (Full) and the Light profile for mobile — each carrying a SubShader per render pipeline, plus the hidden Soft Edge, X-Ray occluder and 2D occluder shaders behind them. No Shader Graph dependency.
• Under Add Component ▸ Keyline: the mesh and sprite outline components, the two sprite occluders, Merge Group, Draw Config, and thirteen recipes in Runtime/Recipes/.
• Sixteen ready-made profile assets — one per style, plus a Light profile for mobile.
• 84 pattern textures (PNG, 256 × 256) for the Pattern style.
• A ten-chapter demo scene, built entirely from script and safe to delete — meshes, skinned character, cutouts, sprites and pixel art.
• Demo models, sprites and textures by Kenney (CC0).
• A 17-section HTML manual with 39 illustrations, plus a quick start — both offline, inside the package.
• README, CHANGELOG, License.txt and Third-Party Notices.txt at the package root.

Technical details

Requirements

• Unity 6000.3 or newer.
• Universal Render Pipeline 17.x or High Definition Render Pipeline 17.x — both ship in the same package and are selected automatically.
• The Built-in Render Pipeline is NOT supported.
• Tested on Windows (URP and HDRP), Android (Vulkan and OpenGLES3) and WebGL. Soft Edge switches itself off under single-pass stereo VR; outlines still render.

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