将 position
从视口空间变换为屏幕空间。
视口空间是标准化的、相对于摄像机的空间。摄像机左下角为
(0,0),右上角为 (1,1)。z 位置为与摄像机的距离,采用世界单位。
屏幕空间以像素定义。屏幕的左下角为 (0,0),右上角
为 (pixelWidth,pixelHeight)。z 位置为与摄像机的距离,采用世界单位。
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); } }
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