Community

Question

I'm trying to set all the vertices of plane to match the height of the terrain. At the moment, it sets about half the plane to some random Y value and ignores the other half. I can't seem to figure out what's going wrong here.

So far this is what I have:

using UnityEngine;
using UnityEditor;
using System.Collections;

public class GroundVertices : MonoBehaviour
{

    [MenuItem("Tools/Ground Vertices")]
    static void Init()
    {
       Mesh m = (Mesh)((MeshFilter)Selection.activeTransform.gameObject.GetComponent(typeof(MeshFilter))).sharedMesh;
       Vector3[] verts = m.vertices;

       for(int i = 0; i < verts.Length; i++)
        {           
           verts[i] = new Vector3(verts[i].x, verts[i].y + 100f, verts[i].z);


         RaycastHit ground = new RaycastHit();
            if(Physics.Raycast(verts[i], Vector3.down, out ground))
            {

               Debug.Log(ground.point.y + ground.transform.tag);
               verts[i].y = ground.point.y;      
         }
        }  

        m.vertices = verts;
        m.RecalculateNormals();
    }
}

Answer 1

Turns out that the issue with half the verts flattening themselves was a red herring. The issue was that I was modifying local points, not world coordinates. Here is my solution:

using UnityEngine;
using UnityEditor;
using System.Collections;

public class GroundVertices : MonoBehaviour
{

    [MenuItem("Tools/Ground Vertices")]
    static void Init()
    {
       GameObject go = Selection.activeTransform.gameObject;
       Mesh m = (Mesh)((MeshFilter)go.GetComponent(typeof(MeshFilter))).sharedMesh;
       Vector3[] verts = m.vertices;
       int layerMask = 1<<10;
       for(int i = 0; i < verts.Length; i++)
        {           
           Vector3 castFrom = go.transform.TransformPoint(verts[i]);     
         RaycastHit ground = new RaycastHit();
            if(Physics.Raycast(castFrom, -Vector3.up, out ground, Mathf.Infinity,layerMask))
            {
             verts[i] = go.transform.InverseTransformPoint(ground.point);
         }
        }  

        m.vertices = verts;
        m.RecalculateBounds();
        m.RecalculateNormals();
       m.Optimize();
    }
}

Community

Set Vertices to Ground

Follow this question

Welcome to Unity Answers

Unity Answers tutorial video!

Related Questions