茶网站建设,wordpress 网络公司主题,广告最多的网站,便宜高端网站设计推荐序之前#xff0c;生成了地形图#xff1a;(42条消息) 从灰度图到地形图_averagePerson的博客-CSDN博客那末#xff0c;地形的法线贴图怎么获取#xff1f;大概分为两个部分吧#xff0c;先拿到法线数据#xff0c;再画到纹理中去。关于法线计算Unity - Scripting API: M…序之前生成了地形图(42条消息) 从灰度图到地形图_averagePerson的博客-CSDN博客那末地形的法线贴图怎么获取大概分为两个部分吧先拿到法线数据再画到纹理中去。关于法线计算Unity - Scripting API: Mesh.RecalculateNormals (unity3d.com)这个链接讲的是法线的计算它是什么空间下的无所谓了……这里也不对地形搞什么几何变换而且它是方向模型空间世界空间是一个结果。获取Unity - Scripting API: Mesh.normals (unity3d.com)直接一个等于号然后这个法线是对顶点不是对三角形面片。就这两点没了。存到纹理中构造Unity - Scripting API: Texture2D (unity3d.com)这个变量好像在unity shader里也经常出现嘞要把法线数据存到Texture2D里首先得构造一下对象啊构造函数是什么Unity - Scripting API: Texture2D.Texture2D (unity3d.com)RGBA32构造RenderTexture的时候也有你。怎么赋值赋值Unity - Scripting API: Texture2D.SetPixels (unity3d.com)直接传数组数组要展平【mesh.normals其实就是一维的那就可以直接用了】最后需要Apply从左到右从下到上【地形顶点正好也是这个顺序的】官方示例代码using UnityEngine;
using System.Collections;public class ExampleClass : MonoBehaviour
{void Start(){Renderer rend GetComponentRenderer();// duplicate the original texture and assign to the materialTexture2D texture Instantiate(rend.material.mainTexture) as Texture2D;rend.material.mainTexture texture;// colors used to tint the first 3 mip levelsColor[] colors new Color[3];colors[0] Color.red;colors[1] Color.green;colors[2] Color.blue;int mipCount Mathf.Min(3, texture.mipmapCount);// tint each mip levelfor (int mip 0; mip mipCount; mip){Color[] cols texture.GetPixels(mip);for (int i 0; i cols.Length; i){cols[i] Color.Lerp(cols[i], colors[mip], 0.33f);}texture.SetPixels(cols, mip);}// actually apply all SetPixels, dont recalculate mip levelstexture.Apply(false);}
}试一试根据文档调api就行了。代码计算法线的using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Terrian : MonoBehaviour
{public int N 10;public Texture2D texture2dHeightMap;[Range(1,100)]public float heightRatio 30.0f;//一个系数控制地形总体的高度的public Texture2D normalTex;MeshRenderer meshRenderer;MeshFilter meshFilter;// 用来存放顶点数据ListVector3 verts;Listint indices;Vector3[] normals;private void Awake(){}private void Start(){verts new ListVector3();indices new Listint();meshRenderer GetComponentMeshRenderer();meshFilter GetComponentMeshFilter();//normalTex new Texture2D(texture2dHeightMap.width, texture2dHeightMap.height, TextureFormat.RGB24,-1,false);normalTex new Texture2D(N,N, TextureFormat.RGB24, -1, false);//2.5D的地形顶点的法线法线贴图规模不是灰度图规模}private void Update(){Generate();normals new Vector3[N * N];normals meshFilter.mesh.normals;for(int i 0; i 10; i){print(normals[i]);}Color[] colors new Color[N * N];for(int i 0; i N * N; i){colors[i] new Color(normals[i].x, normals[i].y, normals[i].z);}normalTex.SetPixels(colors);normalTex.Apply(false);}public void Generate(){ClearMeshData();// 把数据填写好AddMeshData();// 把数据传递给Mesh生成真正的网格Mesh mesh new Mesh();mesh.vertices verts.ToArray();mesh.triangles indices.ToArray();mesh.RecalculateNormals();mesh.RecalculateBounds();meshFilter.mesh mesh;}void ClearMeshData(){verts.Clear();indices.Clear();}void AddMeshData(){//01填充顶点数据for (int z 0; z N; z)//按先x后z的顶点排列顺序所以先循环的是z{for(int x 0; x N; x){int u Mathf.FloorToInt(1.0f * x / N * texture2dHeightMap.width);int v Mathf.FloorToInt(1.0f * z / N * texture2dHeightMap.height);float grayValue texture2dHeightMap.GetPixel(u,v).grayscale;float height grayValue*heightRatio;Vector3 temp new Vector3(x, height, z);verts.Add(temp);}}//02填充索引数据for(int z 0; z N - 1; z){for(int x 0; x N - 1; x){int index_lb z * N x;//index of the left bottom vertex. lb left bottomint index_lt (z 1) * N x;int index_rt (z 1) * N x 1;int index_rb z * N x 1;indices.Add(index_lb);indices.Add(index_lt);indices.Add(index_rt);indices.Add(index_rt);indices.Add(index_rb);indices.Add(index_lb);}}}}显示法线贴图的。这个是在摄像机上的——屏幕后处理嘛using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class ShowTexture2D : MonoBehaviour
{public Terrian terrian;// Start is called before the first frame updatevoid Start(){}// Update is called once per framevoid Update(){}private void OnRenderImage(RenderTexture source, RenderTexture destination){Graphics.Blit(terrian.normalTex, destination);}}结果看着……走势差不多吧。而且绿色的表示向上符合的。对不对在这种情况下没法看出来。只能接着往下做然后拔出萝卜带出泥巴。纯平面是纯绿色高度系数越大颜色越深
