DECAL COLLIDER – Ultimate Runtime Mesh & Collision Decals

Decal Collider is a production-focused Unity tool for creating projected decals that include both a visual mesh and a matching physics collider, with strong support for runtime updates, Sprite/TMP workflows, and Built-in/URP/HDRP pipelines.

As projects grow, decal workflows can become fragile: projection gaps, invalid collider meshes, runtime sync issues on animated content, and heavy rebuild costs.

Decal Collider gives you a single, clean pipeline to keep decal visuals and physics consistent.

✨ Better visual-to-physics consistency

✨ Safer runtime behavior for complex meshes

✨ Faster iteration (project -> tweak -> rebuild -> test)

🛠️ How It Works

• Scans source data (Mesh, SpriteRenderer, or TextMeshPro)
• Projects decal geometry onto target surfaces (18+ directions)
• Builds procedural decal mesh + matching collider
• Applies optional alpha trimming/masking to keep only visible collision areas
• Supports runtime/live updates with controlled rebuild frequency
• Outputs detailed stats for optimization decisions

🎯 Projection + Collider in One Workflow

• Generate visual decal mesh and physics collider together
• Local/world projection control with multi-direction support
• Triplanar and sphere-friendly projection options

🖼️ Sprite + TextMeshPro Support

• Sprite swap/flip aware projection
• Dynamic TMP source support with automatic refresh when content changes
• Stable source detection during mode switches

🔄 Runtime Update System

• Live update interval controls
• Async rebuild API support to reduce frame spikes
• Runtime-safe refresh path for frequently changing decals

🧬 Projection Mask Logic

• Masks empty regions when rays partially hit surfaces
• Keeps source fully visible when no hit occurs (void-safe fallback)

🧯 Physics Safety Layer

• PhysX 5-safe mesh assignment path
• Invalid/zero-volume mesh validation before collider apply
• Safe fallback behavior to avoid collider cooking failures

📊 Stats + Analysis

• Before/after mesh stats and timing data
• Hit ratio and projection diagnostics
• Inspector-side analysis for fast tuning

🧩 Performance Controls

• Cache-friendly rebuild flow
• Optional culling/visibility-based update reductions
• Runtime behavior tuned for larger scenes

📚 API + Tooling

• Public API for automation/integration
• Hit callback hooks for gameplay effects
• Editor tooling, presets, quick actions, and example scenes

📋 Requirements

• Unity 2022.3 LTS or newer (recommended: Unity 6)
• TextMeshPro for TMP-based decal sources
• Works in both Editor and Runtime workflows

🌐 Render Pipelines

• Built-in RP
• URP
• HDRP

💻 Supported Platforms

• Editor: Windows / macOS / Linux
• Runtime Builds: All Unity-supported platforms (PC / Mobile / Console)

🌍 Support & Community

• Join our Discord for support, tips, and update announcements.
• Full documentation included with a quick-start guide.

If Decal Collider improves your workflow, please consider leaving a review.