Camera.ViewportToScreenPoint

描述

将position从视口空间转换为屏幕空间。

视口空间是标准化的，相对于相机的。相机的左下角是 (0,0)；右上角是 (1,1)。z 轴位置是相机的世界单位。

屏幕空间以像素定义。屏幕的左下角是 (0,0)；右上角是 (pixelWidth,pixelHeight)。z 轴位置是相机的世界单位。

using UnityEngine;

public class Example : MonoBehaviour
{
    // Draw an image based on normalized view coordinates
    // rather than pixel positions.
    Texture2D bottomPanel;

    void VPToScreenPtExample()
    {
        var origin = Camera.main.ViewportToScreenPoint(new Vector3(0.25f, 0.1f, 0));
        var extent = Camera.main.ViewportToScreenPoint(new Vector3(0.5f, 0.2f, 0));

        GUI.DrawTexture(new Rect(origin.x, origin.y, extent.x, extent.y), bottomPanel);
    }
}