Sprite.OverrideGeometry

参数

描述

设置新的精灵几何形状。

顶点位置位于 Sprite.rect 空间中，范围为 Rect.zero 到 Rect.size。轴心偏移和单位空间变换是自动完成的。

三角形数组的大小必须始终是 3 的倍数。 通过直接索引到相同顶点可以共享连接到三角形的顶点。

Sprite UVs are calculated automatically by mapping the provided geometry onto the Sprite's Texture.

The Sprite's mesh type will be changed to SpriteMeshType.Tight when the API is called.

See Also: Sprite.rect.

The script example below shows an example on how the API can be used.

// Switch a Sprite's geometry between a triangle and a quad.
using UnityEngine;

public class ExampleClass : MonoBehaviour
{
    private SpriteRenderer m_SpriteRenderer;
    private Rect m_ButtonPos;
    void Start()
    {
        m_SpriteRenderer = gameObject.AddComponent<SpriteRenderer>();
        // Create a blank Texture and Sprite to override later on.
        var texture2D = new Texture2D(64, 64);
        m_SpriteRenderer.sprite = Sprite.Create(texture2D, new Rect(0, 0, texture2D.width, texture2D.height), Vector2.zero, 64);

        m_ButtonPos = new Rect(10.0f, 10.0f, 200.0f, 30.0f);
    }

    // Use OverrideGeometry to switch the Sprite's mesh to a triangle or quad
    void ChangeSprite()
    {
        Sprite o = m_SpriteRenderer.sprite;
        if (o.triangles.Length != 3)
        {
            var sv = new[]
            {
                new Vector2(0, 0),
                new Vector2(o.textureRect.width, 0),
                new Vector2(o.textureRect.width * 0.5f, o.textureRect.height),
            };
            var indices = new ushort[] { 0, 1, 2 };
            o.OverrideGeometry(sv, indices);
        }
        else
        {
            var sv = new[]
            {
                new Vector2(0, 0),
                new Vector2(o.textureRect.width, 0),
                new Vector2(o.textureRect.width, o.textureRect.height),
                new Vector2(0, o.textureRect.height),
            };
            var indices = new ushort[] { 0, 1, 2, 2, 3, 0 };
            o.OverrideGeometry(sv, indices);
        }
    }

    void OnGUI()
    {
        if (GUI.Button(m_ButtonPos, "Perform OverrideGeometry"))
            ChangeSprite();
    }
}