3D modeling

In short: 3D modeling is the creation of three-dimensional objects on the computer, as a mesh of points, edges and faces. It is used for games, films, product design, architecture and 3D printing.

In more detail: A model usually consists of a mesh: vertices connected by edges into faces (mostly triangles or quads). Add to that materials, textures and possibly a skeleton for animation.

In Depth

Methods:

Method	Idea	Typical software
Polygon modeling	Shape the mesh point by point, edge by edge	Blender, Maya, 3ds Max
Sculpting	Like shaping clay, with fine details	ZBrush, Blender Sculpt
CAD / parametric	Exact dimensions, sketches, parts with constraints	Fusion 360, SolidWorks, FreeCAD
NURBS/curves	Smooth mathematical surfaces (cars)	Rhino, Alias
Photogrammetry / 3D scan	From photos or laser scans	RealityCapture, Meshroom
Procedural	Rules generate shapes	Houdini, Geometry Nodes

Workflow in games and films:

1. Concept/reference (sketches).
2. Modeling: Rough shape → details. Few polygons (low poly) for games, many for film.
3. UV unwrapping: The surface is “cut open” flat so textures fit.
4. Texturing: Color, roughness, metal, normal maps (e.g. Substance Painter).
5. Rigging and animation: Bones and movement.
6. Rendering or export into the engine (FBX, glTF, OBJ).

Important terms: Topology (clean arrangement of faces), normals, subdivision, LOD (levels of detail by distance), polycount.

Modeling for 3D printing: The model must be “watertight” (closed shell). Export as STL or 3MF.

Difference from CAD: CAD works with exact dimensions for manufacturing. Artistic modeling works visually and is meant for presentation.

Getting started: Blender (free) with tutorials, for simple parts TinkerCAD in the browser.

See also: CAD, Shaders, Game engine