From Scan to Game-Ready: My Complete 3D Asset Checklist

3D Model Marketplace

Turning a raw 3D scan into a performant, game-ready asset is a meticulous process that blends art, technical skill, and modern tools. In my experience, success hinges on a disciplined, step-by-step pipeline that prioritizes clean geometry, efficient UVs, and optimized textures. This checklist is for 3D artists and technical artists who want a reliable, production-tested workflow to bridge the gap between high-resolution scan data and the stringent requirements of real-time engines. I'll walk through my entire process, from initial cleanup to engine integration, and share where I strategically integrate AI tools to accelerate the most tedious stages without sacrificing quality.

Key takeaways:

• Clean, manifold geometry is the non-negotiable foundation; a flawed mesh will cause problems at every subsequent stage.
• Retopology isn't just about reducing polygons; it's about creating an efficient, animatable edge flow that supports texturing and deformation.
• Texture optimization (resolution, format, packing) has a direct, massive impact on runtime performance and memory usage.
• AI-assisted tools are most valuable for automating repetitive, time-intensive tasks like initial retopology and texture generation, freeing you to focus on artistic direction and technical polish.

My Pre-Processing & Cleanup Workflow

Before any creative work begins, the raw scan data must be stabilized. I treat this phase as non-negotiable prep work; skipping it guarantees headaches later.

Assessing the Raw Scan: What I Look For First

My first step is a thorough inspection in a viewport. I'm not looking for beauty yet—I'm diagnosing structural integrity. I isolate the mesh and check for non-manifold geometry, which are edges or vertices where the mesh doesn't properly define an "inside" and "outside." I also look for internal faces, tiny floating debris from the scan process, and any major holes or tears in the surface. Understanding the scan's density is crucial; I note areas of excessive, unnecessary detail that will need simplification versus areas that are too sparse and might need help.

Cleaning & Repairing: My Go-To Fixes

I start with automated cleanup functions to handle the low-hanging fruit: removing duplicate vertices, deleting loose geometry, and filling small holes. For more complex non-manifold issues, I often use dedicated remeshing or "make manifold" operations. What I've found is that automated tools get you 80% of the way, but the final 20% requires manual inspection. I always orbit the model at wireframe view, zooming in on complex joins (like where a handle meets a cup) to ensure everything is watertight.

Decimation & Simplification: Balancing Detail & Performance

Here, the goal is to reduce polygon count while preserving the scan's defining silhouette and surface detail. A uniform decimation will often destroy important features. My process:

1. Protect the silhouette: I use vertex groups or selection masks to lock the outer edges and major contours from reduction.
2. Aggressive reduction on flat areas: Large, flat planes or gently curved surfaces can tolerate significant polygon reduction.
3. Iterate and check: I apply decimation in stages, frequently checking the result against the original scan to ensure no crucial form is lost. The output of this stage should be a clean, manifold mesh ready for retopology.

Retopology & UV Unwrapping: My Hands-On Process

This is where the technical art truly begins. We're moving from a messy, scan-derived polygon soup to a clean, purpose-built asset.

Why Good Topology is Non-Negotiable

Good topology means edge loops that follow the form and deformation of the object. For a static prop, this ensures clean shading and efficient texturing. For a character or anything that might deform, it's absolutely critical for predictable animation. Bad topology—like long, thin triangles or poles in high-stress areas—will cause textures to warp and models to pinch unnaturally when rigged. In my workflow, I never skip proper retopology for game assets.

My Step-by-Step Retopo Strategy

I approach retopology methodically. For organic forms, I start with the major forms and work towards details, placing edge loops around key features like eyes, mouth, and joints. For hard-surface objects, I follow the natural panel lines and sharp edges. My toolkit includes:

• Manual retopo tools for full control over critical areas.
• AI-assisted retopology for a first pass. I'll often use a tool like Tripo AI to generate a clean, quad-based base mesh from my cleaned scan in seconds. This gives me an excellent starting block that I can then manually refine, which is far faster than starting from a single plane.

UV Layouts That Actually Work for Texturing

A UV map is a 2D blueprint for your 3D texture. A good layout maximizes texel density (texture resolution) and minimizes wasted space and texture stretching.

• My first cut: I start with automated seams, then manually adjust them to be hidden in less visible areas (e.g., under arms, along hard edges).
• Packing rules: I maintain consistent texel density across all UV islands. I pack islands efficiently but leave a few pixels of padding between them to prevent bleeding.
• UDIMs for complex assets: For very high-detail assets, I use UDIM tiles (multiple UV pages) to maintain resolution without creating a single massive texture.

Texturing & Material Creation for Real-Time Engines

Textures bring the asset to life. My goal is to create physically based rendering (PBR) materials that look great and perform efficiently.

Baking Clean Maps: My Setup & Tips

Baking transfers detail from the high-poly scan to the low-poly retopologized mesh via texture maps. A clean bake is essential.

• Cage/Projection: I use a slightly inflated version of my low-poly mesh (a "cage") to control the ray projection from high to low poly, preventing artifacts.
• Key maps I bake: Normal, Ambient Occlusion (AO), Curvature, and Position maps. These become the foundation for my materials.
• Pitfall: Ensure there are no overlapping UVs during the bake, or you'll get smearing.

Creating PBR Materials: What I Do in Substance/Blender

I work in a PBR workflow (Base Color, Roughness, Metallic, Normal). My process:

1. Use my baked AO and Curvature maps as masks to add wear, dirt, and edge variation procedurally.
2. Build up layers of detail, from broad base colors to specific surface imperfections.
3. Constantly check the material in a real-time viewport under different lighting conditions (HDRIs) to ensure it holds up.

Optimizing Textures for Game Performance

Texture memory is a precious resource. My optimization checklist:

• Downsample intelligently: A prop in the distance doesn't need a 4K texture set. I create 2K, 1K, and even 512px versions.
• Use appropriate formats: BC7 for color/normal on DX11+, ASTC for mobile, ETC2 for OpenGL ES.
• Pack channels: I often pack the Roughness and Metallic maps into the Green and Blue channels of a single texture, or AO into the Base Color alpha.

Final Optimization & Engine Integration

The asset isn't done until it runs smoothly in-engine.

LOD Creation: My Rules of Thumb

Level of Detail (LOD) models are lower-poly versions used at a distance. My rules:

• LOD0: My main, fully detailed asset.
• LOD1: ~50% poly reduction. Preserve silhouette, reduce inner detail.
• LOD2: ~25% of original polycount. Drastically simplified forms.
• Automate where possible: I use automated generators for LOD1+, but I always do a manual pass to fix any silhouette or material errors they introduce.

Collision & Physics Setup

Collision meshes are simplified hulls used for physics calculations, separate from the visual mesh.

• For simple shapes: I use primitive collision (boxes, spheres, capsules) in-engine.
• For complex shapes: I generate a simplified convex hull or a low-poly mesh specifically as the collision asset.
• Never use the visual mesh for complex collision unless it's extremely simple—it's a performance killer.

Testing in Engine: My Final Validation Checklist

Before calling an asset final, I import it into my target engine (e.g., Unreal, Unity) and run through this list:

• No console warnings or errors on import.
• Material instances correctly and uses PBR workflow.
• LODs transition smoothly at defined distances.
• Collision works as intended (no falling through floors, correct object interaction).
• Asset performs within target frame-time budget and memory limits.

Accelerating the Pipeline with AI Tools

AI is not a replacement for the artist; it's a powerful assistant that handles the repetitive heavy lifting.

Where AI Fits Into My Traditional Workflow

I integrate AI at specific, high-friction points: generating a first-draft retopology from a cleaned scan, proposing initial UV seam placements, and creating texture baselines. This gives me a 70-80% complete foundation to refine, rather than starting from zero. It turns days of manual work into hours of directed, creative polish.

My Experience with AI-Assisted Retopology & UVs

Using AI for retopology has been a game-changer for my scan-based work. I feed my decimated, cleaned scan into the AI system and within minutes receive a clean, quad-dominant mesh with sensible edge flow. It's not always perfect—sometimes edge loops need redirecting or complex areas need manual work—but it eliminates the soul-crushing initial block of retopology. Similarly, for UVs, an AI can propose a surprisingly logical seam layout that I can then tweak, saving significant time.

Streamlining Texturing with Intelligent Generation

For texturing, I use AI as a powerful idea generator and base-map creator. I can provide a text prompt ("rusted iron with peeling blue paint") or a concept image, and the AI generates a coherent set of PBR texture maps. In my workflow, I then take these generated maps into my standard software as a starting point. I'll project them onto my UVs, use them as layers within my material graphs, and spend my time artistically directing the details, enhancing wear patterns, and ensuring technical correctness for the engine, rather than painting every single base color from scratch.