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SmoothNormal

Purpose

The purpose of this Unity package is to calculate smooth normals for objects that require outlining. In cartoon rendering, smooth normal information is often needed to achieve a good outlining effect.

Algorithm

The smooth normal algorithm employs angle-weighted averaging and is accelerated using a compute shader. However, it's important to note that the current algorithm has a time complexity of O(n^2). Therefore, I recommend splitting your models based on materials rather than using submeshes to optimize performance.

This tool treats nearby vertices in the model as a single vertex, so make sure that the vertices on adjacent surfaces of your model are either merged or close enough to each other.

Usage

You can add this package by UPM (Unity Packages Manager), url like: https://github.com/danbaidong1111/SmoothNormal.git.

The SmoothNormal package filters objects during model import based on the model's name or import path. When a matching model is imported, smooth normals are calculated and ultimately stored in vertex colors or tangents. Users can create their own custom config file by right-clicking in UnityAsset -> Create -> SmoothNormalGlobalConfig. This user-defined config file is globally unique. The default config file is located in the package directory under the "Runtime" folder, named "SmoothNormalAsset." You can determine the current configuration used by checking the "Use User Config" field here.

Config Properties:

• Matching Method: Defines which model will compute smoothnormal.
• Mathing Name Suffix: Match suffix, default is "_SN".
• Write Target: Write smoothnormal data to vertetx color RGB, RG or tangent RGB, RG.
• Vert Dist Thresold: Vertex diatance squre < value will treate as a single vertex. See SmoothNormalGPU computeshader.

Important

Model vertexes should merged by distance.