3D Modeling for Unity: The Complete Guide
Software for 3D Modeling for Unity
There are 3 major tools on the market which you can choose from:
- Blender
- 3Ds Max
- Maya
The Process of Creating a 3D Model for Unity 建立Unity3D模型的流程
Modeling 建模
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Box modeling is a 3D modeling technique where you take a simple shape like a cube, cylinder, or sphere as a starting point and work along the modeling process until the model is complete. Using simple shapes as building blocks is a good way of making your work more efficient and straightforward.
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NURBS (non-uniform rational basis spline) modeling is a mathematical modeling method that’s generating and representing curves and surfaces. The NURBS modeling technique helps 3D artists to use the so-called curve modeling. A 3D artist can draw rough lines and the software will automatically create smooth shapes. The following method can be used for quick prototyping of models by creating basic shapes of an object.
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Digital sculpting is a modeling technique where a 3D artist uses a digital brush to manipulate a 3D object. The process is similar to using clay in real life. But in this case, an artist is using a software editor to work with a digital object. The method allows models to be built extremely quickly, however, it also makes models very polygon-intensive and heavy so that further optimization is required.
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Procedural modeling （程式化建模） is a method of modeling where a 3D artist is using mathematical formulas, algorithms, and sets of rules to build 3D models or environments. Procedural modeling is used with randomized object details such as trees, landscapes, mountains, fire, water, and other substances.
優勢：美術資源重複組合使用，省去大量美術工作時間；多樣性；隨機性；規模化
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Image-based modeling or photogrammetry is a new way of modeling which is based on rendering models from images. An expert takes 360° photos of an object, then uploads them into the software which generates a model. The software creates a 3D model based on the imagery. The cleaner the shots the cleaner the model is. Often, the model requires further manipulations and retopology to make it visually appealing, smooth, and comfortable to work with.
Retopology 重新拓撲
Retopology is the process of converting high-poly models into low-poly ones. This step is an integral part of the post-modeling process that helps make models easy to work with in Unity.
UV mapping
UV mapping is the process of projecting a 2D image to a 3D model’s surface for texturing. In other words, an artist takes a 3D model, unfolds it, and creates a 2D image which is easier to paint textures upon.
2D 影象投影到 3D 模型表面以進行紋理化的過程
工具：Roadkill, Ultimate Unwrap 3D、Blender、Maya
Rigging 骨骼繫結
Rigging is a 3D modeling method of adding bones to a 3D character or an object for creating flexible and movable parts for animation.
骨骼繫結是一種將骨骼新增到 3D 角色或物件的 3D 建模方法，用於建立動畫的靈活和可移動部件。
Skinning 蒙皮
Skinning binds the 3D mesh with the bones (rigging) so that you can move vertices and use your model to the fullest capacity in animation.
Texturing 紋理
Texturing is the final stage of the modeling process. To achieve the best texturing results using with materials and textures an artist has to make sure that the model has been rigged, skinned, retopologized and UV mapped successfully.