OBJ (quad mesh): Advantages of quads in 3D modelling.

The Wavefront OBJ file format primarily deals with polygonal geometry and does not inherently distinguish between triangles and quads. OBJ files can represent 3D models using triangles and quads, and the format itself is agnostic to the specific polygon type. However, there are some general advantages associated with using quads in 3D modelling, which can be applicable when working with OBJ files that contain quad polygons:

Comparison between triangulated mesh and quad mesh.

Comparison between triangulated mesh and quad mesh.

STL (triangulated mesh)

OBJ (quad mesh)

Tools in Fusion 360 allow you to modify the quad mesh

Key points

Key points

Surface Smoothness:

Quads often contribute to smoother surfaces in 3D models compared to triangles.
This is particularly beneficial for representing curved or organic shapes where a continuous and smooth surface is desired.

Mesh Topology:

Quads provide a more regular and structured mesh topology, making it easier to manage and modify the 3D model. This is especially advantageous during the modelling process, where the designer may need to make adjustments to the mesh.

Subdivision Surfaces:

Quads are well-suited for subdivision surfaces. When using subdivision modelling techniques, quads can lead to more predictable and controllable subdivision results, allowing for detailed and refined surfaces.

UV Mapping:

Quads simplify UV mapping, the process of applying textures to 3D models. The regular structure of quads makes it easier to define and manipulate texture coordinates, enhancing the accuracy of texture mapping on the model’s surface.

Animation and Rigging:

In character animation and rigging, quads are often preferred because they can deform more predictably than triangles. This helps achieve smoother and more natural-looking deformations during character animations.

Sculpting and Detailing:

When using sculpting tools or adding fine details to a 3D model, having a mesh composed of quads can provide a more intuitive and artist-friendly experience. Artists often find it easier to control and manipulate quads for these purposes

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Consistency in Modeling Workflows:

Consistency in Modeling Workflows:

Some 3D modelling workflows and software tools are designed with a quad-based modelling approach. Using quads in the OBJ file can ensure consistency when exchanging models between different software applications that favour or optimise for quad-based geometry.3D design and modelling software such as Blender, Zbrush, Rhinoceros and Fusion 360 allows editing and manipulating quad meshes, allowing the user to modify shapes, sizes, textures, etc.