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标题: untiy3d创建锥体代码 [打印本页]

作者: 她。 时间: 2012-8-3 17:49
标题: untiy3d创建锥体代码
功能描述：

This editor script creates a cone with the specified tessellation (=number of vertices), top radius, bottom radius, and length. With top radius == bottom radius, the result is a cylinder. With none of the radii == 0, the result is a ***ncated cone. So far the resulting cone has no end caps, but you can create caps on your own by using a cone with one radius==0 and length==0.
Note it is inevitable that a ***e cone (one of the radii == 0) cannot be rendered completely smooth, and will show facetting artifacts.
使用方法：

Place this script as "CreateCone.cs" in YourProject/Assets/Editor and a menu item will automatically appear in the "GameObject/Create Other" menu after it is compiled.
Num Vertices is the number of vertices each end will have.

Radius Top is the radius at the top. The center point will be located at (0/0/0).

Radius Bottom is the radius at the bottom. The center point will be located at (0/0/Length).

Length is the number of world units long the plane will be (+Z direction).

Opening Angle If this is >0, the top radius is set to 0, and the bottom radius is computed depending on the length, so that the given opening angle is created.

Outside defines whether the outside is visible (default).

Inside defines whether the inside is visible. Set both outside and inside to create a double-sided primitive.

Add Collider creates a matching mesh collider for the cone if checked.

C# - CreateCone.cs

using UnityEngine;
using UnityEditor;

using System.Collections;
// a static method to create a cone primitive (so far no end caps)

// the top center is placed at (0/0/0)

// the bottom center is placed at (0/0/length)

// if either one of the radii is 0, the result will be a cone, otherwise a ***ncated cone

// note you will get inevitable breaks in the smooth shading at cone tips

// Author: Wolfram Kresse

public class CreateCone : ScriptableWizard {
public int numVertices = 10;

public float radiusTop = 0f;

public float radiusBottom = 1f;

public float length = 1f;

public float openingAngle = 0f; // if >0, create a cone with this angle by setting radiusTop to 0, and adjust radiusBottom according to length;

public bool outside = ***e;

public bool inside = false;

public bool addCollider = false;

[MenuItem ("GameObject/Create Other/Cone")]

static void CreateWizard()

{

      ScriptableWizard.DisplayWizard("Create Cone", typeof(CreateCone));

}

void OnWizardCreate(){

      GameObject newCone=new GameObject("Cone");

      // can't access Camera.current

      //newCone.transform.position = Camera.current.transform.position + Camera.current.transform.forward * 5.0f;

      int multiplier=(outside?1:0)+(inside?1:0);

      int offset=(outside&&inside?2*numVertices:0);

      Vector3[] vertices=new Vector3[2*multiplier*numVertices]; // 0..n-1: top, n..2n-1: bottom

      Vector3[] normals=new Vector3[2*multiplier*numVertices];

      Vector2[] uvs=new Vector2[2*multiplier*numVertices];

      int[] tris;

      Mesh mesh=new Mesh();
      if(openingAngle>0&&openingAngle<180){

         radiusTop=0;

         radiusBottom=length*Mathf.Tan(openingAngle*Mathf.Deg2Rad/2);

      }

      float slope=Mathf.Atan((radiusBottom-radiusTop)/length); // (rad difference)/height

      float slopeSin=Mathf.Sin(slope);

      float slopeCos=Mathf.Cos(slope);

      int i;
      for(i=0;i<numVertices;i++){

         float angle=2*Mathf.PI*i/numVertices;

         float angleSin=Mathf.Sin(angle);

         float angleCos=Mathf.Cos(angle);

         float angleHalf=2*Mathf.PI*(i+0.5f)/numVertices; // for degenerated normals at cone tips

         float angleHalfSin=Mathf.Sin(angleHalf);

         float angleHalfCos=Mathf.Cos(angleHalf);
         vertices=new Vector3(radiusTop*angleCos,radiusTop*angleSin,0);

         vertices[i+numVertices]=new Vector3(radiusBottom*angleCos,radiusBottom*angleSin,length);
         if(radiusTop==0)

            normals=new Vector3(angleHalfCos*slopeCos,angleHalfSin*slopeCos,-slopeSin);

         else

            normals=new Vector3(angleCos*slopeCos,angleSin*slopeCos,-slopeSin);

         if(radiusBottom==0)

            normals[i+numVertices]=new Vector3(angleHalfCos*slopeCos,angleHalfSin*slopeCos,-slopeSin);

         else

            normals[i+numVertices]=new Vector3(angleCos*slopeCos,angleSin*slopeCos,-slopeSin);
         uvs=new Vector2(1.0f*i/numVertices,1);

         uvs[i+numVertices]=new Vector2(1.0f*i/numVertices,0);
         if(outside&&inside){

            // vertices and uvs are identical on inside and outside, so just copy

            vertices[i+2*numVertices]=vertices;

            vertices[i+3*numVertices]=vertices[i+numVertices];

            uvs[i+2*numVertices]=uvs;

            uvs[i+3*numVertices]=uvs[i+numVertices];

         }

         if(inside){

            // invert normals

            normals[i+offset]=-normals;

            normals[i+numVertices+offset]=-normals[i+numVertices];

         }

      }

      MeshFilter mf=newCone.AddComponent<MeshFilter>();

      mesh.vertices = vertices;

      mesh.normals = normals;

      mesh.uv = uvs;
      // create triangles

      // here we need to take care of point order, depending on inside and outside

      int cnt=0;

      if(radiusTop==0){

         // top cone

         tris=new int[numVertices*3*multiplier];

         if(outside)

            for(i=0;i<numVertices;i++){

                  tris[cnt++]=i+numVertices;

                  tris[cnt++]=i;

                  if(i==numVertices-1)

                     tris[cnt++]=numVertices;

                  else

                     tris[cnt++]=i+1+numVertices;

            }

         if(inside)

            for(i=offset;i<numVertices+offset;i++){

                  tris[cnt++]=i;

                  tris[cnt++]=i+numVertices;

                  if(i==numVertices-1+offset)

                     tris[cnt++]=numVertices+offset;

                  else

                     tris[cnt++]=i+1+numVertices;

            }

      }else if(radiusBottom==0){

         // bottom cone

         tris=new int[numVertices*3*multiplier];

         if(outside)

            for(i=0;i<numVertices;i++){

                  tris[cnt++]=i;

                  if(i==numVertices-1)

                     tris[cnt++]=0;

                  else

                     tris[cnt++]=i+1;

                  tris[cnt++]=i+numVertices;

            }

         if(inside)

            for(i=offset;i<numVertices+offset;i++){

                  if(i==numVertices-1+offset)

                     tris[cnt++]=offset;

                  else

                     tris[cnt++]=i+1;

                  tris[cnt++]=i;

                  tris[cnt++]=i+numVertices;

            }

      }else{

         // ***ncated cone

         tris=new int[numVertices*6*multiplier];

         if(outside)

            for(i=0;i<numVertices;i++){

                  int ip1=i+1;

                  if(ip1==numVertices)

                     ip1=0;
                  tris[cnt++]=i;

                  tris[cnt++]=ip1;

                  tris[cnt++]=i+numVertices;
                  tris[cnt++]=ip1+numVertices;

                  tris[cnt++]=i+numVertices;

                  tris[cnt++]=ip1;

            }

         if(inside)

            for(i=offset;i<numVertices+offset;i++){

                  int ip1=i+1;

                  if(ip1==numVertices+offset)

                     ip1=offset;
                  tris[cnt++]=ip1;

                  tris[cnt++]=i;

                  tris[cnt++]=i+numVertices;
                  tris[cnt++]=i+numVertices;

                  tris[cnt++]=ip1+numVertices;

                  tris[cnt++]=ip1;

            }

      }

      mesh.triangles = tris;



      mf.mesh = mesh;
      newCone.AddComponent<MeshRenderer>();
      if(addCollider){

         MeshCollider mc=newCone.AddComponent<MeshCollider>();

         mc.sharedMesh=mf.sharedMesh;

      }
      Selection.activeObject = newCone;

}
}
作者: 她。 时间: 2012-8-3 17:54
我爱纳金网~www.narkii.com
作者: 王者再临 时间: 2012-12-30 04:16
学习了，虽然还是有难度，谢谢楼主的用心

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