unity模型制作：绘制一个管道

Posted 2023-02-15 左右...

（不重要的前言：该博文为系列博文，每一篇有前后文关系，例如基类、组件的集成，如果发现有陌生组件和基类，请查看前面文章，本系列文章单纯应用unity的mesh来绘制模型，并未使用任何三方插件，文章内容、代码都是纯手打，望支持）

一个管道有四个面，分别是顶面、地面、内侧面、外侧面，先看顶面：

这其实就是一个铰链，内边和外边的顶点个数是一样的，头尾重合，就能画出一个圆圈。

其他部位：

外圈为circle1，内圈为circle2

circle1和circle2组合成顶面，circle1和circle2向下偏移一个高度circle3和circle4，组合成底面，

circle1和circle3组成外侧面，circle2和circle4组层内侧面

四个面就是四个铰链，用多边形组合也能画，但是顶点会更多，用铰链组件更加合适。

上代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using MeshMaker.Utility;
using UnityEditor;

namespace MeshMaker.Maker

    /// <summary>
    /// 管子
    /// radius = 半径
    /// height = 高度
    /// density = 密度（密度越高，边缘越圆润）
    /// thickness = 管壁厚度
    /// </summary>
    public class PipeMesh : BaseMesh
    
        [CustomEditor(typeof(PipeMesh))]
        public class Attribute : Editor 
            public override void OnInspectorGUI()
            
                PipeMesh mesh = target as PipeMesh;

                mesh.radius = EditorGUILayout.Slider("radius", mesh.radius, 0.1f, 5);
                mesh.height = EditorGUILayout.Slider("height", mesh.height, 0.1f, 5);
                mesh.density = EditorGUILayout.IntSlider("density", mesh.density,3,50);
                mesh.thickness = EditorGUILayout.Slider("thickness", mesh.thickness,0.1f,0.9f);

                if (GUILayout.Button("Create")) mesh.Create();
            
        

        public float radius = 1;
        public float height = 1;
        public int density = 4;
        public float thickness = 0.1f;

        private List<Vector3> positions;

        public override void Create() 
            Init();

            ClearChilds();

            CreateChain0();
            CreateChain1();
            CreateChain2();
            CreateChain3();
        

        private void Init() 

            positions = new List<Vector3>();

            float d = 360f / density;
            for (int i = 0; i < density; i++)
            
                Vector2 v = CircleUtility.GetPosByAngle(radius,d * i);
                positions.Add(new Vector3(v.x, 0, v.y));
            
        

        private void CreateChain0() 

            List<Vector3> vectors = new List<Vector3>();

            for (int i = 0; i < positions.Count; i++)
            
                Vector3 v = positions[i];
                Vector3 dir = (Vector3.zero - v) * thickness;

                vectors.Add(GetPos(positions, i, false));
                vectors.Add(GetPos(positions, i, true));
            

            CreateChain(vectors, true, false);
        

        private void CreateChain1()
        
            List<Vector3> vectors = new List<Vector3>();

            for (int i = 0; i < positions.Count; i++)
            
                Vector3 v = positions[i];
                Vector3 dir = (Vector3.zero - v) * thickness;

                vectors.Add(GetPos(positions, i, false) + Vector3.up * height);
                vectors.Add(GetPos(positions, i, true) + Vector3.up * height);
            

            CreateChain(vectors, true, true);
        

        private void CreateChain2()
        

            List<Vector3> vectors = new List<Vector3>();

            for (int i = 0; i < positions.Count; i++)
            
                Vector3 v = positions[i];
                Vector3 dir = (Vector3.zero - v) * thickness;

                vectors.Add(GetPos(positions, i, false));
                vectors.Add(GetPos(positions, i, false) + Vector3.up * height);
            

            CreateChain(vectors, true, true);
        

        private void CreateChain3()
        
            List<Vector3> vectors = new List<Vector3>();

            for (int i = 0; i < positions.Count; i++)
            
                Vector3 v = positions[i];
                Vector3 dir = (Vector3.zero - v) * thickness;

                vectors.Add(GetPos(positions, i, true));
                vectors.Add(GetPos(positions, i, true) + Vector3.up * height);
            

            CreateChain(vectors, true, false);
        


        private Vector3 GetPos(List<Vector3> positions,int index,bool move) 
            Vector3 v = positions[index];

            if (move)
            
                Vector3 dir = (Vector3.zero - v) * thickness;
                return v + dir;
            
            else
            
                return v;
            
        
    

   

public static Vector2 GetPosByAngle(float radius, float angle)
        

            float x = 0;
            float y = 0;

            if (angle <= 90)
            
                float a = angle;
                float radian = a * Mathf.PI / 180;

                x = radius * Mathf.Sin(radian);
                y = Mathf.Sqrt(radius * radius - x * x);
            
            else if (angle <= 180)
            
                float a = 180 - angle;
                float radian = a * Mathf.PI / 180;

                x = radius * Mathf.Sin(radian);
                y = -Mathf.Sqrt(radius * radius - x * x);
            
            else if (angle <= 270)
            
                float a = angle - 180;
                float radian = a * Mathf.PI / 180;

                x = -radius * Mathf.Sin(radian);
                y = -Mathf.Sqrt(radius * radius - x * x);
            
            else
            
                float a = 360 - angle;
                float radian = a * Mathf.PI / 180;

                x = -radius * Mathf.Sin(radian);
                y = Mathf.Sqrt(radius * radius - x * x);
            

            return new Vector2(x, y);
        

 源码资源：MeshMaker：Unity模型绘制工具-Unity3D文档类资源-CSDN下载