3D modeling is the art of creating digital representations of objects or surfaces using 3D modeling software. In the most basic case, three-dimensional models can be created from simple shapes like cubes, rectangles, and triangles. These shapes are then modified into complex, high-polygon designs.
As a beginner in 3D modeling, there’s a lot you need to know. In this article, we’ll go over the basics and different types of 3D modeling, as well as usage and suggestions for software. We’ll also share some tips and troubleshooting to keep you going. At any point, feel free to refer to the glossary at the end.
Let’s kick-off!
3D modeling is the intermediary step between having an idea and making it real. It can be used to create an interactive design of an object or surface that represents a real-life design.
Depending on the application, it can also be an important step for testing the structural feasibility of a design. For example, a part of a physical object can be created quickly, its physical properties analyzed, and then the model updated as needed.
Whether offline or in-browser, 3D modeling (sometimes called computer-aided design) software allows designers and companies to model products and present them, internally or to clients, before a final product is created. Not surprisingly, 3D modeling can be both time- and cost-efficient.
Now that we know some of the general uses, let’s get into the basics of 3D modeling!
At a fundamental level, you’ll need to know the building blocks of 3D modeling. Here are the most important terms:
Now that we have some basic terms down, let’s move into 3D environments. Every 3D modeling program uses a 3D environment, which is made navigable using vectors and planes.
Another concept you can’t miss in 3D modeling is low-poly models. These are polygonal meshes that have a small number of polygons (see the image above). The low-poly modeling technique is usually used in subdivision modeling, animation, and rigging.
Low-poly models are great if you’re designing a model that you intend to use in a real-time engine, such as Unity. Their main advantages are the ease of loading, viewing, and editing. With a simplified model, there won’t be a lot of detail, but you can work on them quickly.
High-poly models, as the name suggests, are models that have a high polygon count, providing more detail. Due to the density of such a model, editing and moving around the viewpoint takes time and can be much harder. It’s should be no surprise, then, that rendering high-poly models takes significantly longer than low-poly models.
There are three main types of 3D modeling used in CAD software. Later in the article, we’ll go over how these modeling types work.
Unsurprisingly, this 3D modeling technique is used to produce solid shapes. It aims to ensure that the 3D models are geometrically correct. Compared to the other two types, solid modeling is more complex, as it requires simulating the exterior and interior of the model.
Solid modeling is helpful for creating, animating, designing, and visualizing functional models. The designer is able to see how the design looks and works from the very beginning.
Surface modeling is a mathematical method for displaying or presenting solid 3D objects. It focuses on the external aspect of a 3D model, allowing you to view the 3D model from different angles.
Surface modeling is easier to work with than solid modeling, though it’s more complex than wireframe. It’s mostly used in architectural illustrations and animations in video games.
Wireframe modeling is based on generating a 3D model by “bending a wire” and following the edges of an object. These 3D models consist entirely of points, arcs, circles, curves, and lines.
A wireframe object is not recognized as solid. Instead, the boundary of the object is recorded as points and their connections.
When compared to surface and solid modeling, wireframe is the least complex method of representing 3D objects. Typically, triangles are the basic elements in wireframe modeling. The more triangles, the higher the realism.
In addition to the main three, there are some other methods of 3D modeling, which we’ll briefly mention here:
How 3D modeling works differs from the type being used. Let’s learn more!
A 3D designer begins by preparing the wireframe model of the solid object to be created. The wireframe model is then converted into a 3D view and surfaces are added in to create a 3D model. Techniques used include Boolean operations, pick and place, and parametric modeling.
Note that not all solid modeling programs can achieve the above.
In surface modeling, one begins by defining the shapes and exterior curves of a model. Unlike in solid modeling, the objects can be physically and geometrically incorrect (with no thickness or properties of mass defined). This is helpful, as the designer will be able to manipulate the object easily with fewer restrictions.
Because of its flexibility, it’s relatively easy to work on imported objects. Deleting and replacing the faces of an imported object, for example, is straightforward.
3D modeling software with brushes is often called sculpting. Creating a model with sculpting tools involves pulling, pushing, smoothing, and pinching surfaces of a solid object. Complicated calculations are used to create detailed meshes that look more like real-life models.
This process often begins with a basic model or shape. Sculpting tools are then used to manipulate the surfaces. The first layer formed during sculpting defines the basic features of the model, like the nose. Once the basic shape is created, you can then subdivide the geometry to add finer details. Minor textures are added to layers with many details with further subdivisions.
Texturing and painting can also be used to make the model look more realistic. The artist can even make the model appear more complicated than it is. There are many built-in textures within 3D modeling software, and some programs even allow you to import your own.
As a beginner in 3D modeling, there are some things that you’re guaranteed to stumble upon on your journey:
3D modeling has made it into many fields, including ones you expect and some not so obvious.
Certain file formats store various kinds of information about 3D models. The most common file types supported by CAD programs include:
3D modeling can be a confusing experience for beginners as there’s so much to process. There are some common mistakes most newbies make when learning 3D modeling that can lead to more challenges later on. After learning them, you’ll know how to avoid them!
Now that we know some of the pitfalls and solutions that can befall modeling newbies, let’s go over some more tricks!
License: The text of "How to 3D Model: The Basics of 3D Modeling" by All3DP is licensed under a Creative Commons Attribution 4.0 International License.