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标题: unity3d 图形吧 之 场景中画圆 [打印本页]
作者: tianhett 时间: 2015-2-7 22:52
标题: unity3d 图形吧 之 场景中画圆
先看一下效果：
区别就是一个2d一个3d.
2d就不介绍了，相对简单一些，对于3d的内容，我们先来看一看数学中的一个题和答案，这样就很容易理解程序了。
这样就好办了！ 直接看下面几个脚本吧。
using UnityEngine;
using System.Collections;
using SunGuangDong.Math;
[ExecuteInEditMode]
public class DrawCircleMono : MonoBehaviour {
private Vector3 m_Normal ;
// Use this for initialization
void Start () {
m_Normal = new Vector3 (0, 1, 0);
}
void OnDrawGizmos()
{
Circle2d circle2 = new Circle2d(transform.position, 5);
DrawCircle(ref circle2, Color.red);
Vector3 center = new Vector3 (transform.position.x, transform.position.y + 0.2f, transform.position.z);
Circle3d circle3 = new Circle3d(ref center,ref m_Normal, 5);
DrawCircle (circle3, Color.red, 40);
}
protected void DrawCircle(ref Circle2d circle, Color color)
{
int count = 40;
float delta = 2f * Mathf.PI / count;
Vector3 prev = circle.Eval(0);
Color tempColor = Gizmos.color;
Gizmos.color = color;
for (int i = 1; i <= count; ++i)
{
Vector3 curr = circle.Eval(i * delta);
Gizmos.DrawLine(prev, curr);
prev = curr;
}
Gizmos.color = tempColor;
}
protected void DrawCircle(Vector2 center, float radius, Color color)
{
Circle2d circle = new Circle2d(ref center, radius);
int count = 40;
float delta = 2f * Mathf.PI / count;
Vector3 prev = circle.Eval(0);
Color tempColor = Gizmos.color;
Gizmos.color = color;
for (int i = 1; i <= count; ++i)
{
Vector3 curr = circle.Eval(i * delta);
Gizmos.DrawLine(prev, curr);
prev = curr;
}
Gizmos.color = tempColor;
}
protected void DrawCircle(Circle3d circle, Color color, int count = 20)
{
float delta = 2f * Mathf.PI / count;
Vector3 prev = circle.Eval(0);
Color tempColor = Gizmos.color;
Gizmos.color = color;
for (int i = 1; i <= count; ++i)
{
Vector3 curr = circle.Eval(i * delta);
Gizmos.DrawLine(prev, curr);
prev = curr;
}
Gizmos.color = tempColor;
}
}
上面这个脚本在 挂到场景中的任意对象上，如Cube
namespace SunGuangDong.Math
{
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using UnityEngine;
[StructLayout(LayoutKind.Sequential)]
public struct Circle2d
{
public Vector2 Center;
public float Radius;
public Circle2d(ref Vector2 center, float radius)
{
this.Center = center;
this.Radius = radius;
}
public Circle2d(Vector2 center, float radius)
{
this.Center = center;
this.Radius = radius;
}
public float CalcPerimeter()
{
return (6.283185f * this.Radius);
}
public float CalcArea()
{
return ((3.141593f * this.Radius) * this.Radius);
}
public Vector2 Eval(float t)
{
return new Vector2(this.Center.x + (this.Radius * Mathf.Cos(t)), this.Center.y + (this.Radius * Mathf.Sin(t)));
}
public Vector2 Eval(float t, float radius)
{
return new Vector2(this.Center.x + (radius * Mathf.Cos(t)), this.Center.y + (radius * Mathf.Sin(t)));
}
public bool Contains(ref Vector2 point)
{
Vector2 vector = point - this.Center;
return (vector.magnitude <= (this.Radius * this.Radius));
}
public bool Contains(Vector2 point)
{
Vector2 vector = point - this.Center;
return (vector.magnitude <= (this.Radius * this.Radius));
}
public void Include(ref Circle2d circle)
{
Vector2 vector = circle.Center - this.Center;
float num = vector.magnitude;
float num2 = circle.Radius - this.Radius;
float num3 = num2 * num2;
if (num3 >= num)
{
if (num2 >= 0f)
{
this = circle;
}
}
else
{
float num4 = Mathf.Sqrt(num);
if (num4 > 1E-05f)
{
float num5 = (num4 + num2) / (2f * num4);
this.Center += (Vector2) (num5 * vector);
}
this.Radius = 0.5f * ((num4 + this.Radius) + circle.Radius);
}
}
public void Include(Circle2d circle)
{
this.Include(ref circle);
}
}
}
namespace SunGuangDong.Math
{
using System;
using System.Runtime.InteropServices;
using UnityEngine;
[StructLayout(LayoutKind.Sequential)]
public struct Circle3d
{
public Vector3 Center;
public Vector3 Axis0;
public Vector3 Axis1;
public Vector3 Normal;
public float Radius;
public Circle3d(ref Vector3 center, ref Vector3 normal, float radius)
{
this.Center = center;
this.Normal = normal;
Vector3ex.CreateOrthonormalBasis(out this.Axis0, out this.Axis1, ref this.Normal);
this.Radius = radius;
}
public Circle3d(Vector3 center, Vector3 normal, float radius)
{
this.Center = center;
this.Normal = normal;
Vector3ex.CreateOrthonormalBasis(out this.Axis0, out this.Axis1, ref this.Normal);
this.Radius = radius;
}
public float CalcPerimeter()
{
return (6.283185f * this.Radius);
}
public float CalcArea()
{
return ((3.141593f * this.Radius) * this.Radius);
}
public Vector3 Eval(float t)
{
return (this.Center + ((Vector3) (this.Radius * ((Mathf.Cos(t) * this.Axis0) + (Mathf.Sin(t) * this.Axis1)))));
}
public Vector3 Eval(float t, float radius)
{
return (this.Center + ((Vector3) (radius * ((Mathf.Cos(t) * this.Axis0) + (Mathf.Sin(t) * this.Axis1)))));
}
}
}
namespace SunGuangDong.Math
{
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using UnityEngine;
public static class Vector3ex
{
public static readonly Vector3 Zero = new Vector3(0f, 0f, 0f);
public static void CreateOrthonormalBasis(out Vector3 u, out Vector3 v, ref Vector3 w)
{
if (Mathf.Abs(w.x) >= Mathf.Abs(w.y))
{
float num = Mathfex.InvSqrt((w.x * w.x) + (w.z * w.z));
u.x = -w.z * num;
u.y = 0f;
u.z = w.x * num;
v.x = w.y * u.z;
v.y = (w.z * u.x) - (w.x * u.z);
v.z = -w.y * u.x;
}
else
{
float num2 = Mathfex.InvSqrt((w.y * w.y) + (w.z * w.z));
u.x = 0f;
u.y = w.z * num2;
u.z = -w.y * num2;
v.x = (w.y * u.z) - (w.z * u.y);
v.y = -w.x * u.z;
v.z = w.x * u.y;
}
}
}
}
namespace SunGuangDong.Math
{
using System;
using System.Runtime.InteropServices;
using UnityEngine;
public static class Mathfex
{
public const float Pi = 3.141593f;
public static float InvSqrt(float value)
{
if (value != 0f)
{
return (1f / Mathf.Sqrt(value));
}
return 0f;
}
}
}
最后附上一些其他图片吧。
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作者: HIDEOKOJIMA 时间: 2015-2-7 23:29
Thanks for sharing this one !
作者: myonkyo 时间: 2015-2-8 11:19
感谢分享，谢谢提供下载
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