Unity：用鼠标拖动子网格

Question

我必须立方体网格，每个面都是一个单独的子网格。我希望能够用鼠标拖动子网格。这是改变立方体的大小。我有子网格的索引。

我有以下代码，但增量计算不起作用。目前，子网格体扭曲并且移动不均匀。计算增量运动的正确方法是什么？

private Vector3 worldPosition;

void OnMouseDown()
{
    Vector3 mousePos = Input.mousePosition;
    mousePos.z = Camera.main.nearClipPlane;
    worldPosition = Camera.main.ScreenToWorldPoint(mousePos);
}


void OnMouseDrag()
{
    Vector3 mousePos = Input.mousePosition;
    mousePos.z = Camera.main.nearClipPlane;
    Vector3 currentPosition = Camera.main.ScreenToWorldPoint(mousePos);

    Vector3 delta = currentPosition - worldPosition;

    int[] subMeshTris = mf.mesh.GetTriangles(submeshIndex);

    Mesh mesh = mf.mesh;
    Vector3[] vertices = mesh.vertices;
    for (int i = 0; i < subMeshTris.Length; i++)
    {
        vertices[subMeshTris[i]] += delta;
    }

    mesh.vertices = vertices;

    mf.mesh = mesh;
}

Answer 1

我已经弄清楚了。 submeshTris 数组有两个重复的顶点，因此在每个循环中将增量添加到这些顶点两次。我添加了一个列表，其中填充了唯一的顶点索引。

    List<int> uniqueIndices = new List<int>();
    for (int i = 0; i < subMeshTris.Length; i++)
    {
        if (!uniqueIndices.Contains(subMeshTris[i]))
        {
            uniqueIndices.Add(subMeshTris[i]);
        }
    }

    for (int i = 0; i < uniqueIndices.Count; i++)
    {
        vertices[uniqueIndices[i]] += delta;
    }