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  • Unity3d 用鼠标拾取模型顶点 三

                                                                                  Unity3d 用鼠标拾取模型顶点 三

                我们接着第二篇,描绘点的方式,就用自带的Sphere,然后做成预制件(Prefab),然后在顶点的位置,绘制Sphere,效果还可以!上一节说了,找到鼠标发出的射线与模型的碰撞面三角形(Triangle),我的做法是,判断鼠标Input.mousePosition与三角形的三个顶点哪个顶点最近,这个就是鼠标选择顶点!

                 代码如下:

                

    using UnityEngine;
    using System.Collections;
    public class DrawBox : MonoBehaviour {
        public GameObject sphere1;
    	// Update is called once per frame
    	void Update () {
            RaycastHit hit;
            Ray ray = Camera.mainCamera.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit, 100))
            {
                Debug.Log(hit.collider.gameObject.name);
                MeshCollider collider = hit.collider as MeshCollider;
                if (collider == null||collider.sharedMesh==null)
                    return;
                Mesh mesh0 = collider.sharedMesh;
                Vector3[] vertices = mesh0.vertices;
                int[] triangles = mesh0.triangles;
                Vector3 p0 = hit.transform.TransformPoint(vertices[triangles[hit.triangleIndex * 3]]);
                Vector3 p1 = hit.transform.TransformPoint(vertices[triangles[hit.triangleIndex * 3+1]]);
                Vector3 p2 = hit.transform.TransformPoint(vertices[triangles[hit.triangleIndex * 3+2]]);
                sphere1.transform.position = MinDistanceMouse(p0, p1, p2);
            }
    	}
        Vector3 MinDistanceMouse(Vector3 v1, Vector3 v2, Vector3 v3)
        {
            Vector3 mouseposition = Input.mousePosition;
            float distance1 = Vector3.Distance(v1, mouseposition);
            float distance2 = Vector3.Distance(v2, mouseposition);
            float distance3= Vector3.Distance(v3, mouseposition);
            if (distance1 < distance2 && distance1 < distance3)
                return v1;
            if (distance2 < distance1 && distance2 < distance3)
                return v2;
            if (distance3 < distance1 && distance3 < distance2)
                return v3;
            return Vector3.zero;
        }
    }
    

      

       

                其中MinDistanceMouse方法就是选择哪个是离鼠标最近的点!

                这一章节说到这儿,下一节开始编辑顶点,呵呵!

               

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  • 原文地址:https://www.cnblogs.com/alongu3d/p/editvertices.html
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