Triangle Count View Mode – Unreal Engine

Editor plugin for Unreal Engine 5 that colors meshes in the viewport by their LOD0 triangle count like Shader Complexity, but for geometry weight.
Helps you find the heaviest meshes in your scene at a glance.

Key features:
Per-mesh triangle count visualization with customizable color ranges
Post-process + Custom Stencil rendering mesh materials are never modified, fully save-safe
Per-instance counting for Foliage, ISM, and HISM
Supports Static Meshes, Skeletal Meshes, Nanite fallback proxies, and World Partition external actors
Camera radius filter and auto-follow for scenes with 1M+ actors
Three interpolation modes: Stepped, Smooth, and Smooth Log (for wide dynamic ranges)
Configurable Custom Stencil range to avoid collision with outline / highlight systems
In-viewport legend with live min / median / max stats
Force LOD0 toggle for accurate displayed counts
Auto-deactivates safely before Save, PIE, and editor close

Use cases:
Foliage optimization in open worlds
Polygon budget diagnostics during pre-production
Reviewing assets from outsource teams
Educational visualization of mesh cost
Editor-only no runtime impact, not included in packaged builds.
Tested on Unreal Engine 5.7 (should also build on 5.8).
Free for personal use.

Features:
Visualizes per-mesh LOD0 triangle counts in the viewport using customizable color ranges
Post-process based rendering, mesh materials are never modified, fully save-safe
Per-instance counting for Foliage, ISM, and HISM components
Three interpolation modes: Stepped, Smooth, Smooth Log (for wide dynamic ranges)
Camera radius filter and auto-follow for large scenes (1M+ actors)
Nanite fallback proxy counting and Skeletal Mesh support
Configurable Custom Stencil range to avoid collision with outline / highlight systems
In-viewport legend with live min / median / max stats
Force LOD0 toggle for accurate displayed counts
Auto-deactivate hooks for Save, PIE, and editor close
Code Modules:
Triangle Count View Mode (Editor)
Number of Blueprints: 0
Number of C++ Classes: 7
Network Replicated: No
Supported Development Platforms:
Windows: Yes
Mac: Yes – not tested
Supported Unreal Engine Versions: 5.7
Supported Target Build Platforms: Editor-only plugin, not included in packaged builds

Important/Additional Notes: This is an editor-only tool intended for development workflows (scene auditing, foliage optimization, polygon budget diagnostics). It has no runtime impact and is not included in packaged builds.
The plugin requires Custom Depth-Stencil Pass, which it enables automatically on activation and restores on deactivation.
Requires Unreal Engine 5.7 or later.

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