Question

JavaScript => public function Clear(keepVertexLayout: bool = true): void;
C# => public void Clear(bool keepVertexLayout = true);

Description 描述

Clears all vertex data and all triangle indices.

You should call this function before rebuilding triangles array.

清空所有顶点数据和三角形索引，你应该在重建三角形数组前使用这个函数。

JavaScript:

	// Draws a simple triangle with UVs
 
	function Start () {
		gameObject.AddComponent.<MeshFilter>();
		gameObject.AddComponent.<MeshRenderer>();
		var mesh : Mesh = GetComponent.<MeshFilter>().mesh;
 
		// Clears all the data that the mesh can contain previously.
		mesh.Clear();
 
		mesh.vertices = [Vector3(0,0,0), Vector3(0,1,0), Vector3(1, 1, 0)];
		mesh.uv = [Vector2 (0, 0), Vector2 (0, 1), Vector2 (1, 1)];
		mesh.triangles = [0, 1, 2];
	}

C#:

using UnityEngine;
using System.Collections;
 
public class ExampleClass : MonoBehaviour {
    void Start() {
        gameObject.AddComponent<MeshFilter>();
        gameObject.AddComponent<MeshRenderer>();
        Mesh mesh = GetComponent<MeshFilter>().mesh;
        mesh.Clear();
        mesh.vertices = new Vector3[] {new Vector3(0, 0, 0), new Vector3(0, 1, 0), new Vector3(1, 1, 0)};
        mesh.uv = new Vector2[] {new Vector2(0, 0), new Vector2(0, 1), new Vector2(1, 1)};
        mesh.triangles = new int[] {0, 1, 2};
    }
}

Default behaviour of this function keeps the existing vertex layout: if the mesh had tangent vectors and vertex colors, for example, then the tangents and colors will be part of mesh data once you fill in new vertex data. If you want to completely clear the mesh and start with an empty vertex layout, pass false for keepVertexLayout parameter. Alternatively, assigning an empty array to any mesh component will also remove it from the vertex layout.

该函数的默认行为保留了现有的顶点布局：如果网格有切线和顶点颜色，例如，一旦你填充新的顶点数据，切线和颜色将是网格数据的一部分。如果你想完全清除网格，并开始使用一个空的顶点布局，设置为true，设置为false，保留顶点布局。另外，指定空数组到任意网格组件也将删除定点布局。

Mesh