# The Definition of Topology and Its Purpose in 3D Animation

## Good topology uses only the number of shapes necessary for a project

As you learn to make 2D representations of 3D objects on the screen, think of 3D topology as the wireframe of an object. The wireframe, which is referred to in 3D software as the mesh, is made up of hundreds or thousands of simple geometric shapes.

The term topology refers to the geometric surface characteristics of the mesh. Each geometric surface on the mesh is a face. The wireframe is the foundation of 3D modeling, which eventually results in three-dimensional digital animation.

## Wireframe Characteristics of Good Topology

A wireframe contains many polygons, vertices (the point at which three or more edges meet), edges (lines made up of two vertices), arcs, curves, and circles. These shapes form faces in the wireframe design.

In computer-generated 3D topology, the goal is to have sufficient detail in the wireframe while keeping the number of faces to the minimum number necessary to accomplish the job. In areas where the 3D model needs to bend or move, the designer usually increases the number of polygons to allow for movement without distortion.

Elsewhere, fewer polygons are required. This concept is essential when modeling for 3D animation. The increased polygonal faces in areas of a 3D model that undergo the most deformation during the animation, such as joints, facial features, and moving parts, are crucial to realistic motion.

3D modelers strive for clean topology, typically illustrated by a 3D mesh with efficient polygon distribution, proper placement of edge loops, and clean, precise creases that minimize stretching and distortion.

## Beginner Tips on Topology and 3D Modeling

Topology is a big topic, but beginning 3D modelers can benefit from a few tips:

• Use four-sided polygons freely, but avoid N-gons that have five or more sides.
• Use triangles sparingly unless the software you use welcomes triangle meshes (some do).
• Avoid using elongated polygons. Four-sided polygons should be relatively square.
• Keep it simple in the beginning. Model a square or a sphere. Then, move on to modeling a snowman, which is mostly spheres, a square, and a triangle. Don't start with an ambitious project until you're comfortable with the software.
• When you're ready, try some simple online 3D modeling tutorials.
• Even if you can afford the top-of-the-line 3D modeling software, start with one of the free 3D modeling programs for beginners.
• 3D modeling is difficult to learn. Be patient.

## 3D Modeling Software for Beginners

Several free 3D software programs are available. Any of these is a beneficial place for a beginning modeler to start:

• Daz Studio
• Hexagon
• Blender
• Sculptris

Most 3D modeling software sites provide tutorial videos to help beginners become proficient with the concepts behind 3D modeling.

## 3D Modeling Software for Professionals

Professional-level 3D modeling programs can be intimidating and expensive. However, suppose you plan to be active in 3D animation (whether for creating video games, computer graphics, or films). In that case, you'll need to become an expert in one of them. Advanced-level 3D modeling software programs include:

• Autodesk Maya
• Modo by Foundry