RaycastHit.textureCoord 纹理坐标

# [RaycastHit](RaycastHit.html).textureCoord 纹理坐标

var *textureCoord* : [Vector2](../Vector2/Vector2.html)

*Description* 描述

The uv texture coordinate at the impact point.

在碰撞点的 UV 纹理坐标。

This can be used for 3D texture painting or drawing bullet marks. If the
collider is no mesh collider, zero [Vector2](../Vector2/Vector2.html)
will be returned.

这个可用于 3D 纹理绘制或绘制弹痕。如果碰撞器不是网格碰撞器，将被返回零 Vector2。

```
// Attach this script to a camera and it will paint black pixels in 3D
// on whatever the user clicks. Make sure the mesh you want to paint
// on has a mesh collider attached.
//附加这个脚本到相机，当用户点击时
//它将在3D中绘制黑色的像素，确保绘制的网格附加有一个网格碰撞器.
function Update () {
	// Only when we press the mouse
	//只有在按下鼠标时
	if (!Input.GetMouseButton (0))
	return;

// Only if we hit something, do we continue
	//只有碰到某些东西，继续
	var hit : RaycastHit;
	if (!Physics.Raycast (camera.ScreenPointToRay(Input.mousePosition), hit))
		return;

// Just in case, also make sure the collider also has a renderer
	// material and texture. Also we should ignore primitive colliders.
	//以防万一，还要确保碰撞器也有一个渲染器、材质和纹理.我们也应该忽略几何体碰撞器.
	var renderer : Renderer = hit.collider.renderer;
	var meshCollider = hit.collider as MeshCollider;
	if (renderer == null || renderer.sharedMaterial == null ||
		renderer.sharedMaterial.mainTexture == null || meshCollider == null)
	return;

// Now draw a pixel where we hit the object
	//现在在所碰到的物体上绘制一个像素
	var tex : Texture2D = renderer.material.mainTexture;
	var pixelUV = hit.textureCoord;
	pixelUV.x *= tex.width;
	pixelUV.y *= tex.height;

tex.SetPixel(pixelUV.x, pixelUV.y, Color.black);

tex.Apply();
}
```

参见：Physics.Raycast, Physics.Linecast, Physics.RaycastAll.