转载：http://www.manew.com/thread-42935-1-1.html?_dsign=4597a598
其实和 小地图都差不多了。 还是要借助 另一个相机
目的: 这篇文章的主要目的是 要给你一个想法 如何做放大境效果 。
在unity中可以简单的实现放大镜效果啊 . 那么现在就来一步一步实现这个：
创建一个摄像机对象，设置 projection 类型为 perspective 或者 orthographic.
设置相机的 orthographicSize 或者 fieldOfView (依赖于相机的 projection 类型 ).
设置其 pixelrect . 例如如果您想要在你鼠标位置显示放大境 和其大小是 100 x 100 , 然后设置pixelrect 为 :
magnifyCamera.pixelRect = new Rect (Input.mousePosition.x – 100f / 2.0f, Input.mousePosition.y – 100f / 2.0f, 100f, 100f);
设置相机的位置。 例如 如果你想在 你的鼠标位置显示放大镜效果 ，那么设置相机的位置为 mousePosition世界点。
你能看到最终的效果图：
下面的 C# 脚本将创建一个 MagnifyGlass，并将它移动到 mousePosition位置 。
MagnifyGlass 脚本: 添加到一个空的游戏对象。
[C#]
纯文本查看
复制代码
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using
UnityEngine;
using
System.Collections;
public
class
MagnifyGlass : MonoBehaviour
{
private
Camera magnifyCamera;
private
GameObject magnifyBorders;
private
LineRenderer LeftBorder, RightBorder, TopBorder, BottomBorder;
// Reference for lines of magnify glass borders
private
float
MGOX,MG0Y;
// Magnify Glass Origin X and Y position
private
float
MGWidth = Screen.width/5f,MGHeight = Screen.width/5f;
// Magnify glass width and height
private
Vector3 mousePos;
void
Start ()
{
createMagnifyGlass ();
}
void
Update ()
{
// Following lines set the camera's pixelRect and camera position at mouse position
magnifyCamera.pixelRect =
new
Rect (Input.mousePosition.x - MGWidth / 2.0f, Input.mousePosition.y - MGHeight / 2.0f, MGWidth, MGHeight);
mousePos = getWorldPosition (Input.mousePosition);
magnifyCamera.transform.position = mousePos;
mousePos.z = 0;
magnifyBorders.transform.position = mousePos;
}
// Following method creates MagnifyGlass
private
void
createMagnifyGlass()
{
GameObject camera =
new
GameObject(
"MagnifyCamera"
);
MGOX = Screen.width / 2f - MGWidth/2f;
MG0Y = Screen.height / 2f - MGHeight/2f;
magnifyCamera = camera.AddComponent<Camera>();
magnifyCamera.pixelRect =
new
Rect(MGOX, MG0Y, MGWidth, MGHeight);
magnifyCamera.transform.position =
new
Vector3(0,0,0);
if
(Camera.main.isOrthoGraphic)
{
magnifyCamera.orthographic =
true
;
magnifyCamera.orthographicSize = Camera.main.orthographicSize / 5.0f;
//+ 1.0f;
createBordersForMagniyGlass ();
}
else
{
magnifyCamera.orthographic =
false
;
magnifyCamera.fieldOfView = Camera.main.fieldOfView / 10.0f;
//3.0f;
}
}
// Following method sets border of MagnifyGlass
private
void
createBordersForMagniyGlass()
{
magnifyBorders =
new
GameObject ();
LeftBorder = getLine ();
LeftBorder.SetVertexCount(2);
LeftBorder.SetPosition(0,
new
Vector3(getWorldPosition(
new
Vector3(MGOX,MG0Y,0)).x,getWorldPosition(
new
Vector3(MGOX,MG0Y,0)).y-0.1f,-1));
LeftBorder.SetPosition(1,
new
Vector3(getWorldPosition(
new
Vector3(MGOX,MG0Y+MGHeight,0)).x,getWorldPosition(
new
Vector3(MGOX,MG0Y+MGHeight,0)).y+0.1f,-1));
LeftBorder.transform.parent = magnifyBorders.transform;
TopBorder = getLine ();
TopBorder.SetVertexCount(2);
TopBorder.SetPosition(0,
new
Vector3(getWorldPosition(
new
Vector3(MGOX,MG0Y+MGHeight,0)).x,getWorldPosition(
new
Vector3(MGOX,MG0Y+MGHeight,0)).y,-1));
TopBorder.SetPosition(1,
new
Vector3(getWorldPosition(
new
Vector3(MGOX+MGWidth,MG0Y+MGHeight,0)).x,getWorldPosition(
new
Vector3(MGOX+MGWidth,MG0Y+MGHeight,0)).y,-1));
TopBorder.transform.parent = magnifyBorders.transform;
RightBorder = getLine ();
RightBorder.SetVertexCount(2);
RightBorder.SetPosition(0,
new
Vector3(getWorldPosition(
new
Vector3(MGOX+MGWidth,MG0Y+MGWidth,0)).x,getWorldPosition(
new
Vector3(MGOX+MGWidth,MG0Y+MGWidth,0)).y+0.1f,-1));
RightBorder.SetPosition(1,
new
Vector3(getWorldPosition(
new
Vector3(MGOX+MGWidth,MG0Y,0)).x,getWorldPosition(
new
Vector3(MGOX+MGWidth,MG0Y,0)).y-0.1f,-1));
RightBorder.transform.parent = magnifyBorders.transform;
BottomBorder = getLine ();
BottomBorder.SetVertexCount(2);
BottomBorder.SetPosition(0,
new
Vector3(getWorldPosition(
new
Vector3(MGOX+MGWidth,MG0Y,0)).x,getWorldPosition(
new
Vector3(MGOX+MGWidth,MG0Y,0)).y,-1));
BottomBorder.SetPosition(1,
new
Vector3(getWorldPosition(
new
Vector3(MGOX,MG0Y,0)).x,getWorldPosition(
new
Vector3(MGOX,MG0Y,0)).y,-1));
BottomBorder.transform.parent = magnifyBorders.transform;
}
// Following method creates new line for MagnifyGlass's border
private
LineRenderer getLine()
{
LineRenderer line =
new
GameObject(
"Line"
).AddComponent<LineRenderer>();
line.material =
new
Material(Shader.Find(
"Diffuse"
));
line.SetVertexCount(2);
line.SetWidth(0.2f,0.2f);
line.SetColors(Color.black, Color.black);
line.useWorldSpace =
false
;
return
line;
}
private
void
setLine(LineRenderer line)
{
line.material =
new
Material(Shader.Find(
"Diffuse"
));
line.SetVertexCount(2);
line.SetWidth(0.2f,0.2f);
line.SetColors(Color.black, Color.black);
line.useWorldSpace =
false
;
}
// Following method calculates world's point from screen point as per camera's projection type
public
Vector3 getWorldPosition(Vector3 screenPos)
{
Vector3 worldPos;
if
(Camera.main.isOrthoGraphic)
{
worldPos = Camera.main.ScreenToWorldPoint (screenPos);
worldPos.z = Camera.main.transform.position.z;
}
else
{
worldPos = Camera.main.ScreenToWorldPoint (
new
Vector3 (screenPos.x, screenPos.y, Camera.main.transform.position.z));
worldPos.x *= -1;
worldPos.y *= -1;
}
return
worldPos;
}
}
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相信你可以通过这个 做的更好！