Pixel Sprite Outline — real-time outline effect

Sprite Outline adds a crisp, pixel-perfect outline to any SpriteRenderer using just a single component. Designed specifically for pixel art and 2D sprites, it respects hard pixel edges and delivers clean outlines at any resolution. No material editing. No shader graphs. No post-processing. Just add the component and it works instantly on any sprite. Features: Zero Setup - Attach the component, and the outline appears immediately; Pixel-Perfect Edge Detection - Works beautifully with pixel art sprites; Adjustable Thickness - Fine-tune outline thickness from 0 to 16 pixels; Full Color Control - Pick any outline color via the Inspector or runtime API; Alpha Threshold - Adjust which sprite edges get outlined; Sorting Offset - Renders cleanly behind the sprite with zero z-fighting; Animation-Ready - Fully compatible with Unity Animator, sprite swapping, and flipping; Pipeline Agnostic - Seamlessly supports Built-in, URP, and HDRP; Runtime API - Control outline color, thickness, and more directly from code. How it works: The component creates a lightweight overlay mesh behind your sprite and uses an edge-detection shader that samples 8 neighboring pixels. Only the edges are colored and the original sprite remains completely untouched. Performance: Highly Optimized with only 1 extra draw call per outlined sprite; Lightweight with just 4 vertices per outline mesh; No Overhead - Zero render textures, command buffers, or post-processing passes required. Customization: Outline Color, Outline Pixels (0 to 16), Alpha Threshold (0.0 to 1.0), Sorting Order Offset. What is included: SpriteOutlineRenderer.cs (Main component), SpriteOutlineOnly.shader (Edge-detection shader), Interactive demo scene with UI controls, Demo character sprites.