准备灰度图  

1、高程按比例对应hue色相(hsv)生成mesh效果
o.color = float4(hsv2rgb(float3(v.vertex.y/100.0, 0.5, 0.75)), 1.0);

unity shader

  1. Shader "Unlit/vertexColor 1"
  2. {
  3. 	Properties
  4. 	{
  5. 		_MainTex ("Texture", 2D) = "white" {}
  6. 	}
  7. 	SubShader
  8. 	{
  9. 		Tags { "RenderType"="Opaque" }
  10. 		LOD 100
  11.  
  12. 		Pass
  13. 		{
  14. 			CGPROGRAM
  15. 			#pragma vertex vert
  16. 			#pragma fragment frag
  17. 			// make fog work
  18. 			#pragma multi_compile_fog
  19. 			
  20. 			#include "UnityCG.cginc"
  21.  
  22. 			struct appdata
  23. 			{
  24. 				float4 vertex : POSITION;
  25. 				float2 uv : TEXCOORD0; 
  26. 			};
  27.  
  28. 			struct v2f
  29. 			{
  30. 				float2 uv : TEXCOORD0;
  31. 				UNITY_FOG_COORDS(1)
  32. 				float4 vertex : SV_POSITION;
  33. 				float4 color:COLOR;
  34. 			};
  35.  
  36. 			sampler2D _MainTex;
  37. 			float4 _MainTex_ST;
  38. 			
  39. 			float3 hsv2rgb(float3 c)
  40. 			{
  41. 				float4 K = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
  42. 				float3 p = abs(frac(c.xxx + K.xyz) * 6.0 - K.www);
  43. 				return c.z * lerp(K.xxx, saturate(p - K.xxx), c.y);
  44. 			}
  45.  
  46.  
  47. 			v2f vert (appdata v)
  48. 			{
  49. 				v2f o;
  50. 				o.vertex = UnityObjectToClipPos(v.vertex);
  51. 				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
  52. 				o.color = float4(hsv2rgb(float3(v.vertex.y/100.0, 0.5, 0.75)), 1.0);
  53. 				UNITY_TRANSFER_FOG(o,o.vertex);
  54. 				return o;
  55. 			}
  56. 			
  57. 			fixed4 frag (v2f i) : SV_Target
  58. 			{
  59. 				// sample the texture
  60. 				//fixed4 col = tex2D(_MainTex, i.uv);
  61. 				fixed4 col = i.color;
  62. 				// apply fog
  63. 				UNITY_APPLY_FOG(i.fogCoord, col);
  64. 				return col;
  65. 			}
  66. 			ENDCG
  67. 		}
  68. 	}
  69. }

　　

2、高程按比例对应色带生成mesh效果

准备色带图

unity shder

  1. Shader "Unlit/colorRamp"
  2. {
  3. 	Properties
  4. 	{
  5. 		_MainTex ("Texture", 2D) = "white" {}
  6. 	    _ColorRamp("Color Ramp", 2D) = "white" {}
  7. 	}
  8. 	SubShader
  9. 	{
  10. 		Tags { "RenderType"="Opaque" }
  11. 		LOD 100
  12.  
  13. 		Pass
  14. 		{
  15. 			CGPROGRAM
  16. 			#pragma vertex vert
  17. 			#pragma fragment frag
  18. 			// make fog work
  19. 			#pragma multi_compile_fog
  20. 			
  21. 			#include "UnityCG.cginc"
  22.  
  23. 			struct appdata
  24. 			{
  25. 				float4 vertex : POSITION;
  26. 				float2 uv : TEXCOORD0;
  27. 			};
  28.  
  29. 			struct v2f
  30. 			{
  31. 				float2 uv : TEXCOORD0;
  32. 				UNITY_FOG_COORDS(1)
  33. 				float4 vertex : SV_POSITION;
  34. 				float2 colorUV : TEXCOORD1;
  35. 			};
  36.  
  37. 			sampler2D _MainTex;
  38. 			sampler2D _ColorRamp;
  39. 			float4 _MainTex_ST;
  40. 			
  41. 			v2f vert (appdata v)
  42. 			{
  43. 				v2f o;
  44. 				o.vertex = UnityObjectToClipPos(v.vertex);
  45. 				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
  46. 				UNITY_TRANSFER_FOG(o,o.vertex);
  47. 				o.colorUV =  float2(v.vertex.y / 100.0,0);
  48. 				return o;
  49. 			}
  50. 			
  51. 			fixed4 frag (v2f i) : SV_Target
  52. 			{ 
  53. 				fixed4 col = tex2D(_ColorRamp,i.colorUV);
  54. 				// apply fog
  55. 				UNITY_APPLY_FOG(i.fogCoord, col);
  56. 				return col;
  57. 			}
  58. 			ENDCG
  59. 		}
  60. 	}
  61. }

　　

mesh创建脚本

  1. using System.Collections;
  2. using System.Collections.Generic;
  3. using UnityEngine;
  4.  
  5. public class meshCreate2 : MonoBehaviour { 
  6.  
  7.     private Texture textureGray;//灰度图
  8.     private Texture textureGrass;//草地贴图
  9.     private int tGrayWidth = 0, tGrayHeight = 0;//灰度图的宽和高
  10.     private bool bCreate = false;//是否完成创建
  11.     private List<GameObject> meshList;//mesh集合
  12.     private Texture2D texture2dGray;
  13.     public float zScale = 100;//高度参数
  14.  
  15.     [Tooltip("传入mesh使用的材质")]
  16.     public Material meshMaterial;
  17.  
  18.     void Start()
  19.     {
  20.         StartCoroutine(loadImage("IGray.png", (t) => textureGray = t));
  21.         StartCoroutine(loadImage("IGrass.jpg", (t) => textureGrass = t));
  22.         meshList = new List<GameObject>();
  23.     }
  24.  
  25.     void Update()
  26.     {
  27.         if (textureGray != null && textureGrass != null)
  28.         {
  29.             if (bCreate == false)
  30.             {
  31.                 tGrayWidth = textureGray.width;
  32.                 tGrayHeight = textureGray.height;
  33.                 meshMaterial.mainTexture = textureGrass;//设置材质贴图
  34.                 //mesh顶点数目最大65000，则取mes为250*250=62500
  35.                 int xNum = 1 + tGrayWidth / 250;//x方向mesh个数
  36.                 int zNum = 1 + tGrayHeight / 250; //z方向mesh个数
  37.                 texture2dGray = (Texture2D)textureGray;
  38.                 //根据灰度图创建mesh
  39.                 for (int i = 0; i < xNum; i++)
  40.                 {
  41.                     for (int j = 0; j < zNum; j++)
  42.                     {
  43.                         if (i < xNum - 1 && j < zNum - 1)
  44.                         {
  45.                             meshList.Add(
  46.                                 createMesh("meshX" + i.ToString() + "Z" + j.ToString(), 251, 251,
  47.                                 i * new Vector3(2500, 0, 0) + j * new Vector3(0, 0,2500),
  48.                                 (i + 1) * new Vector3(2500, 0, 0) + (j + 1) * new Vector3(0, 0,2500) + new Vector3(10,  0,10),
  49.                                 i * new Vector2(250, 0) + j * new Vector2(0, 250),
  50.                                 (i + 1) * new Vector2(250, 0) + (j + 1) * new Vector2(0, 250) + new Vector2(1, 1)));
  51.                         }
  52.                         else if (i == xNum - 1 && j < zNum - 1)
  53.                         {
  54.                             meshList.Add(createMesh("meshX" + i.ToString() + "Z" + j.ToString(), tGrayWidth % 250, 251,
  55.                             i * new Vector3(2500, 0, 0) + j * new Vector3(0, 0,2500),
  56.                             i * new Vector3(2500, 0, 0) + new Vector3(10 * (tGrayWidth % 250),  0,10) + (j + 1) * new Vector3(0, 0,2500),
  57.                             i * new Vector2(250, 0) + j * new Vector2(0, 250),
  58.                             i * new Vector2(250, 0) + new Vector2(tGrayWidth % 250, 1) + (j + 1) * new Vector2(0, 250)));
  59.                         }
  60.                         else if (i < xNum - 1 && j == zNum - 1)
  61.                         {
  62.                             meshList.Add(createMesh("meshX" + i.ToString() + "Z" + j.ToString(), 251, tGrayHeight % 250,
  63.                               i * new Vector3(2500, 0, 0) + j * new Vector3(0, 0,2500),
  64.                              (i + 1) * new Vector3(2500, 0, 0) + j * new Vector3(0, 0,2500) + new Vector3(10, 0, 10 * (tGrayHeight % 250)),
  65.                               i * new Vector2(250, 0) + j * new Vector2(0, 250),
  66.                              (i + 1) * new Vector2(250, 0) + j * new Vector2(0, 150) + new Vector2(1, tGrayHeight % 250)));
  67.                         }
  68.                         else if (i == xNum - 1 && j == zNum - 1)
  69.                         {
  70.                             meshList.Add(createMesh("meshX" + i.ToString() + "Z" + j.ToString(), tGrayWidth % 250, tGrayHeight % 250,
  71.                              i * new Vector3(2500, 0, 0) + j * new Vector3(0, 0, 2500),
  72.                              i * new Vector3(2500, 0, 0) + j * new Vector3(0, 0, 2500) + new Vector3(10 * (tGrayWidth % 250),  0, 10 * (tGrayHeight % 250)),
  73.                              i * new Vector2(250, 0) + j * new Vector2(0, 250),
  74.                              i * new Vector2(250, 0) + j * new Vector2(0, 250) + new Vector2(tGrayWidth % 250, tGrayHeight % 250)));
  75.                         }
  76.                     }
  77.                 }
  78.                 bCreate = true;
  79.             }
  80.         }
  81.     }
  82.  
  83.     //加载图片
  84.     IEnumerator loadImage(string imagePath, System.Action<Texture> action)
  85.     {
  86.         WWW www = new WWW("file://" + Application.streamingAssetsPath + "/" + imagePath);
  87.         yield return www;
  88.         if (www.error == null)
  89.         {
  90.             action(www.texture);
  91.         }
  92.     }
  93.  
  94.  
  95.     /// <summary>
  96.     ///创建mesh 
  97.     /// </summary>
  98.     /// <param name="meshName">mesh名称</param>
  99.     /// <param name="row">行数</param>
  100.     /// <param name="col">列数</param>
  101.     /// <param name="minPoint">最小点位置</param>
  102.     /// <param name="maxPoint">最大点位置</param>
  103.     /// <param name="minImgPosition">最小点灰度图位置</param>
  104.     /// <param name="maxImgPosition">最大点灰度图位置</param>
  105.     /// <returns></returns>
  106.     /// 
  107.  
  108.  
  109.     private GameObject createMesh(string meshName, int row, int col, Vector3 minPoint, Vector3 maxPoint, Vector2 minImgPosition, Vector2 maxImgPosition)
  110.     {
  111.         GameObject meshObject = new GameObject(meshName);
  112.  
  113.         int verticeNum = row * col;
  114.         Vector3[] vertices = new Vector3[verticeNum];//顶点数组大小 
  115.         int[] triangles = new int[verticeNum * 3 * 2];//三角集合数组,保存顶点索引 
  116.                                                       // Vector3[] normals = new Vector3[verticeNum];//顶点法线数组大小
  117.         Vector2[] uvs = new Vector2[verticeNum];
  118.         float rowF = (float)row;
  119.         float colF = (float)col;
  120.         Vector3 xStep = new Vector3((maxPoint.x - minPoint.x) / rowF, 0, 0);
  121.         Vector3 zSetp = new Vector3(0,  0, (maxPoint.z - minPoint.z) / colF);
  122.         int k = 0;
  123.  
  124.         for (int i = 0; i < row; i++)
  125.         {
  126.             for (int j = 0; j < col; j++)
  127.             {
  128.                 float tempZ = texture2dGray.GetPixel((int)minImgPosition.x + i, (int)minImgPosition.y + j).grayscale;
  129.                 vertices[i + j * row] = minPoint + xStep * i + zSetp * j + new Vector3(0, tempZ * zScale,0);
  130.  
  131.                 uvs[i + j * row] = new Vector2((float)i / rowF, (float)j / colF);
  132.  
  133.                 if (j < col - 1 && i < row - 1)
  134.                 {
  135.                     triangles[k++] = j * row + i; 
  136.                     triangles[k++] = j * row + i + row;
  137.                     triangles[k++] = j * row + i + 1;
  138.  
  139.                     triangles[k++] = j * row + i + row; 
  140.                     triangles[k++] = j * row + i + row + 1;
  141.                     triangles[k++] = j * row + i + 1;
  142.                 }
  143.             }
  144.         }
  145.         Mesh mesh = new Mesh();
  146.         mesh.vertices = vertices;
  147.         mesh.triangles = triangles;
  148.         // mesh.normals = normals;
  149.         mesh.uv = uvs;
  150.         mesh.RecalculateBounds();
  151.         mesh.RecalculateNormals();
  152.         meshObject.AddComponent<MeshFilter>();
  153.         meshObject.AddComponent<MeshRenderer>();
  154.         meshObject.GetComponent<MeshFilter>().mesh = mesh;
  155.         meshObject.GetComponent<MeshRenderer>().material = meshMaterial;
  156.  
  157.         return meshObject;
  158.     }
  159. }

　　相机漫游控制脚本

  1. using System.Collections;
  2. using System.Collections.Generic;
  3. using UnityEngine;
  4.  
  5. public class MyCameraControl : MonoBehaviour
  6. {
  7.     public Camera mainCam;
  8.     //旋转变量;
  9.     private float m_deltX = 0f;
  10.     private float m_deltY = 0f;
  11.     //缩放变量;
  12.     private float m_distance = 10f;
  13.     private float m_mSpeed = 5f;
  14.     //移动变量;
  15.     private Vector3 m_mouseMovePos = Vector3.zero;
  16.     //平移速度
  17.     float Speed = 200f;
  18.  
  19.     void Start()
  20.     {
  21.         //  transform.localPosition = new Vector3(0, m_distance, 0);
  22.     }
  23.  
  24.     void Update()
  25.     {
  26.  
  27.         if (Input.GetKey(KeyCode.W))
  28.         {
  29.             transform.Translate(Vector3.forward * Time.deltaTime * Speed);
  30.         }
  31.         if (Input.GetKey(KeyCode.A))
  32.         {
  33.             transform.Translate(Vector3.left * Time.deltaTime * Speed);
  34.         }
  35.         if (Input.GetKey(KeyCode.S))
  36.         {
  37.             transform.Translate(Vector3.forward * Time.deltaTime * -Speed);
  38.         }
  39.         if (Input.GetKey(KeyCode.D))
  40.         {
  41.             transform.Translate(Vector3.left * Time.deltaTime * -Speed);
  42.         }
  43.         //鼠标左键控制旋转
  44.         if (Input.GetMouseButton(0))
  45.         {
  46.             m_deltX += Input.GetAxis("Mouse X") * m_mSpeed;
  47.             m_deltY -= Input.GetAxis("Mouse Y") * m_mSpeed;
  48.             m_deltX = ClampAngle(m_deltX, -360, 360);//旋转幅度 左右
  49.             m_deltY = ClampAngle(m_deltY, -70, 70);//旋转幅度 上下
  50.             transform.rotation = Quaternion.Euler(m_deltY, m_deltX, 0);
  51.         }
  52.         //鼠标滑轮缩放
  53.         if (Input.GetAxis("Mouse ScrollWheel") != 0)
  54.         {
  55.             //自由缩放方式;
  56.             m_distance = Input.GetAxis("Mouse ScrollWheel") * 10f;
  57.             transform.localPosition = transform.position + transform.forward * m_distance;
  58.         }
  59.  
  60.         //相机位置跳到点击处;
  61.         if (Input.GetMouseButtonDown(1)) //0-左键 1-右键 2-滑轮
  62.         {
  63.             Ray ray = mainCam.ScreenPointToRay(Input.mousePosition);//从摄像机发出到点击坐标的射线
  64.             RaycastHit hitInfo;
  65.             if (Physics.Raycast(ray, out hitInfo))
  66.             {
  67.                 m_mouseMovePos = hitInfo.point;
  68.                 transform.localPosition = m_mouseMovePos;
  69.             }
  70.         }
  71.  
  72.     }
  73.  
  74.     float ClampAngle(float angle, float minAngle, float maxAgnle)
  75.     {
  76.         if (angle <= -360)
  77.             angle += 360;
  78.         if (angle >= 360)
  79.             angle -= 360;
  80.  
  81.         return Mathf.Clamp(angle, minAngle, maxAgnle);
  82.     }
  83.  
  84.  
  85. }

 

本文链接

https://www.cnblogs.com/gucheng/p/10945429.html

 

版权声明：本文为gucheng原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://www.cnblogs.com/gucheng/p/10945429.html