Definition
A polygon mesh is a way of representing a 3D object as a network of flat shapes, usually triangles, joined together to form its surface. These connected polygons approximate the shape of an object, creating a continuous, solid-looking surface.
Unlike a point cloud, which is just a set of separate points, a mesh links points into faces, giving a defined surface that can be shaded, textured, and rendered realistically. Meshes are a standard form of 3D geometry.
In simple terms, a polygon mesh is a 3D shape built from many small connected faces that together form its surface.
How It Works
A polygon mesh is made of three basic parts: vertices, which are points in space, edges, which connect vertices, and faces, which are the flat polygons enclosed by edges. Together these define the surface of an object in 3D.
Meshes are often created by converting point clouds into surfaces, a process that connects nearby points into faces, or by modelling directly in 3D software. More faces allow finer detail, while fewer faces make a lighter, simpler model.
Applications
Polygon meshes are used in 3D modelling, gaming, animation, engineering, and reality capture. They turn scanned point clouds into usable surfaces, provide models for visualisation and simulation, and serve as the standard geometry for most 3D applications.
Benefits
- Defined, continuous 3D surfaces.
- Ready for shading, texturing, and rendering.
- Adjustable detail through face count.
- Widely supported across 3D software.
- A practical result of converting point clouds.
Related Terms
- Point Cloud
- 3D Model
- Normal (Surface Normal)
- PLY (Polygon File Format)
Frequently Asked Questions
What is a polygon mesh used for?
It is used to represent 3D surfaces for modelling, gaming, animation, engineering, and reality capture.
What is the difference between a mesh and a point cloud?
A point cloud is a set of separate points, while a mesh connects points into faces to form a continuous surface.
What are meshes made of?
They are made of vertices (points), edges (connections), and faces (the flat polygons that form the surface).
How is a mesh created from a point cloud?
Software connects nearby points into faces, turning the scattered points into a continuous surface.
About Track3D
Track3D helps teams turn point clouds and scans into accurate 3D models and digital twins. Learn more at Track3D.
