What is 3D modeling?
3D modeling is the process of creating three-dimensional digital objects, using techniques like polygon modeling, digital sculpting, and procedural generation.
For real-time applications like games, this also means planning for optimization, texture mapping, and level-of-detail from the start, not just building a shape.
How does 3D modeling work?
Artists choose a technique based on the subject matter and intended use case:
- Polygon modeling: Builds objects by manipulating vertices, edges, and faces, ideal for hard-surface objects with precise edges and flat surfaces. Unity's ProBuilder lets you do this directly in the Editor.
- Digital sculpting: Deforms mesh surfaces with brush-like tools for a more organic result, well suited to natural forms and fine surface detail. Unity's Polybrush brings sculpting, texture blending, and object scattering into the Editor, too.
- Procedural modeling: Generates geometry from rules or algorithms rather than manual placement, commonly used for terrain, vegetation, and other content that needs to be created at scale. Unity's SpeedTree toolkit is a real example built specifically for this.
Regardless of technique, workflows typically progress from basic forms to refined details, with topology optimization to keep animation deformation and rendering efficient. UV mapping then enables texture application, and normal maps let high-resolution detail live on an optimized, lower-resolution mesh.
For interactive applications, level-of-detail systems swap between model resolutions based on viewing distance, preserving visual quality without the performance cost of full detail at every distance.
A typical modeling workflow
1. Block out the basic shape
2. Refine details with polygon modeling or sculpting
3. Optimize topology for animation and rendering
4. Apply UV mapping
5. Add texture and normal maps
6. Set up level-of-detail for real-time performance
Once a model exists, it's ready for the next stage of the pipeline: rigging to prepare it for movement, and 3D animation to actually bring it to life.