GL.TexCoord 纹理坐标

static function TexCoord (v : Vector3) : void

Description描述

Sets current texture coordinate (v.x,v.y,v.z) for all texture units.

设置当前纹理(v.x,v.y,v.z)坐标用于所有的纹理单元。

In OpenGL this matches glMultiTexCoord for all texture units or glTexCoord when no multi-texturing is available. On other graphics APIs the same functionality is emulated.

这个函数和OpenGL中的glMultiTexCoord（多重纹理），glTexCoord函数一样。其它的图形API也有对应的功能。

The Z component is used only when:

1. You access a cubemap (which you access with a vector coordinate, hence x,y & z).
2. You do "projective texturing", where the X & Y coordinates are divided by Z to get the final coordinate. This would be mostly useful for water reflections and similar things.

Z坐标用在以下情况：

1. 六面体纹理。
2. 投影纹理。Z有X，Y坐标得到。例如水面倒射效果。

This function can only be called between GL.Begin and GL.End functions.

这个函数只能在GL.Begin 和GL.End 之间使用。

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public Material mat;
	void OnPostRender() {
		if (!mat) {
			Debug.LogError("Please Assign a material on the inspector");
			return;
		}
		GL.PushMatrix();
		mat.SetPass(1);
		GL.Color(new Color(1, 1, 1, 1));
		GL.LoadOrtho();
		GL.Begin(GL.QUADS);
		GL.TexCoord(new Vector3(0, 0, 0));
		GL.Vertex3(0.25F, 0.25F, 0);
		GL.TexCoord(new Vector3(0, 1, 0));
		GL.Vertex3(0.25F, 0.75F, 0);
		GL.TexCoord(new Vector3(1, 1, 0));
		GL.Vertex3(0.75F, 0.75F, 0);
		GL.TexCoord(new Vector3(1, 0, 0));
		GL.Vertex3(0.75F, 0.25F, 0);
		GL.End();
		GL.PopMatrix();
	}
}

// Draws a Quad in the middle of the screen and
// Adds the material's Texture to it.
//在屏幕的中心绘制一个方形，并添加材质的纹理给它
var mat : Material;
function OnPostRender() {
	if (!mat) {
		Debug.LogError("Please Assign a material on the inspector");
		return;
	}
		GL.PushMatrix();
		mat.SetPass(1);
		GL.Color(Color(1,1,1,1));
		GL.LoadOrtho();
		GL.Begin(GL.QUADS);
		GL.TexCoord(Vector3(0,0,0));
		GL.Vertex3(0.25,0.25,0);
		GL.TexCoord(Vector3(0,1,0));
		GL.Vertex3(0.25,0.75,0);
		GL.TexCoord(Vector3(1,1,0));
		GL.Vertex3(0.75,0.75,0);
		GL.TexCoord(Vector3(1,0,0));
		GL.Vertex3(0.75,0.25,0);
		GL.End();
		GL.PopMatrix();
}