一個園 等分成 6份 ， 得出 六個 圓上的點， 兩兩畫線得出 一個 六邊形了
C# 代碼部分：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class TmpGL : MonoBehaviour
{ // When added to an object, draws colored rays from the
// transform position.
public int lineCount = 100;
public float radius = 3.0f;
Vector3[] myPoint;
Vector3[] myPoint1;
Vector3[] myPoint2;
Vector3[] myPoint3;
static Material lineMaterial;
private void Start()
{
myPoint = new Vector3[lineCount];
myPoint1 = new Vector3[lineCount];
myPoint2 = new Vector3[lineCount];
myPoint3 = new Vector3[lineCount];
for (int i = 0; i < lineCount; ++i)
{
float a = i / (float)lineCount;
float angle = a * Mathf.PI * 2;
myPoint[i]= new Vector3(Mathf.Cos(angle) * radius, Mathf.Sin(angle) * radius, 0);
myPoint1[i] = new Vector3(Mathf.Cos(angle) *( radius-1), Mathf.Sin(angle) * (radius - 1), 0);
myPoint2[i] = new Vector3(Mathf.Cos(angle) * (radius - 2), Mathf.Sin(angle) * (radius - 2), 0);
myPoint3[i] = new Vector3(Mathf.Cos(angle) * (radius - 3), Mathf.Sin(angle) * (radius - 3), 0);
}
}
static void CreateLineMaterial()
{
if (!lineMaterial)
{
// Unity has a built-in shader that is useful for drawing
// simple colored things.
Shader shader = Shader.Find("Hidden/Internal-Colored");
lineMaterial = new Material(shader);
lineMaterial.hideFlags = HideFlags.HideAndDontSave;
// Turn on alpha blending
lineMaterial.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
lineMaterial.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
// Turn backface culling off
lineMaterial.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);
// Turn off depth writes
lineMaterial.SetInt("_ZWrite", 0);
}
}
// Will be called after all regular rendering is done
public void OnRenderObject()
{
CreateLineMaterial();
// Apply the line material
lineMaterial.SetPass(0);
GL.PushMatrix();
// Set transformation matrix for drawing to
// match our transform
GL.MultMatrix(transform.localToWorldMatrix);
// Draw lines
GLLines();
GLLines(myPoint);
GLLines(myPoint1);
GLLines(myPoint2);
GLLines(myPoint3);
GLTrianGles(myPoint2);
// GLTrianGles2(myPoint2);
GL.PopMatrix();
}
void GLLines()
{
GL.Begin(GL.LINES);
for (int i = 0; i < lineCount; ++i)
{
float a = i / (float)lineCount;
float angle = a * Mathf.PI * 2;
// Vertex colors change from red to green
// GL.Color(new Color(a, 1 - a, 0, 0.8F));
// One vertex at transform position
GL.Vertex3(0, 0, 0);
// Another vertex at edge of circle
GL.Vertex3(Mathf.Cos(angle) * radius, Mathf.Sin(angle) * radius, 0);
}
GL.End();
}
void GLLines(Vector3[] mPoint)
{
GL.Begin(GL.LINES);
for (int i = 0; i < lineCount; ++i)
{
GL.Vertex(mPoint[i]);
int tmp = (i + 1) % lineCount;
GL.Vertex(mPoint[tmp]);
}
GL.End();
}
void GLTrianGles(Vector3[] mPoint)
{
GL.Begin(GL.TRIANGLES);
for (int i = 0; i < lineCount; ++i)
{
GL.Color(Color.blue);
GL.Vertex(mPoint[i]);
int tmp = (i + 1) % lineCount;
GL.Vertex(mPoint[tmp]);
GL.Vertex3(0, 0, 0);
}
GL.End();
}
void GLTrianGles2(Vector3[] mPoint)
{
GL.Begin(GL.TRIANGLES);
for (int i = 0; i < lineCount; ++i)
{
GL.Color(Color.blue);
GL.Vertex(mPoint[i]);
int tmp = (i + 2) % lineCount;
GL.Vertex(myPoint[tmp]);
int tmp1 = (i + 1) % lineCount;
GL.Vertex(myPoint1[tmp1]);
}
GL.End();
}
}