Unity - 柏林噪音八度
Unity - Perlin noise Octaves
我正在尝试按照教程在 unity 中设置简单的地形生成器,到目前为止它按预期工作,但我想做更多 "natural" 看看,发现我需要做八度或多级噪音.
我在网上找到的关于多级 Perlin 噪声的所有内容对我来说都无法理解,或者使用了完全不同的方法。
using UnityEngine;
[RequireComponent(typeof(MeshFilter))]
public class Mesh_Generator : MonoBehaviour
{
#region Variables
Mesh mesh;
Vector3[] vertices;
//Vector2[] Uvs;
Color[] colors;
int[] triangles;
[Range(1, 9999)]
public int xSize = 100;
[Range(1, 9999)]
public int zSize = 100;
public Gradient gradient;
public float MinHeight = 0;
public float MaxHeight = 0;
public bool Reset_Min_Max;
#endregion
#region Octaves
[Range(1, 6)]
public int Octaves = 6;
public int Scale = 50;
public float offsetX = 0f;
public float offsetY = 0f;
public float Frequency_01 = 5f;
public float FreqAmp_01 = 3f;
public float Frequency_02 = 6f;
public float FreqAmp_02 = 2.5f;
public float Frequency_03 = 3f;
public float FreqAmp_03 = 1.5f;
public float Frequency_04 = 2.5f;
public float FreqAmp_04 = 1f;
public float Frequency_05 = 2f;
public float FreqAmp_05 = .7f;
public float Frequency_06 = 1f;
public float FreqAmp_06 = .5f;
#endregion
#region Start
void Start()
{
mesh = new Mesh();
GetComponent<MeshFilter>().mesh = mesh;
offsetX = Random.Range(0f, 99999f);
offsetY = Random.Range(0f, 99999f);
}
#endregion
void ResetMinMax()
{
MinHeight = 0f;
MaxHeight = 0f;
Reset_Min_Max = false;
}
#region Update
private void Update()
{
if (Reset_Min_Max)
ResetMinMax();
CreateShape();
UpdateMesh();
}
#endregion
#region CreateShape
void CreateShape()
{
#region Vertices
vertices = new Vector3[(xSize + 1) * (zSize + 1)];
for (int i = 0, z = 0; z <= zSize; z++)
{
for (int x = 0; x <= xSize; x++)
{
float y = Calculate(x, z);
vertices[i] = new Vector3(x, y, z);
if (y > MaxHeight)
MaxHeight = y;
if (y < MinHeight)
MinHeight = y;
i++;
}
}
int vert = 0;
int tris = 0;
#endregion
#region Triangles
triangles = new int[xSize * zSize * 6];
for (int z = 0; z < zSize; z++)
{
for (int x = 0; x < xSize; x++)
{
triangles[tris + 0] = vert + 0;
triangles[tris + 1] = vert + xSize + 1;
triangles[tris + 2] = vert + 1;
triangles[tris + 3] = vert + 1;
triangles[tris + 4] = vert + xSize + 1;
triangles[tris + 5] = vert + xSize + 2;
vert++;
tris += 6;
}
vert++;
}
#endregion
#region Gradient Color
colors = new Color[vertices.Length];
for (int i = 0, z = 0; z <= zSize; z++)
{
for (int x = 0; x <= xSize; x++)
{
float Height = Mathf.InverseLerp(MinHeight, MaxHeight, vertices[i].y);
colors[i] = gradient.Evaluate(Height);
i++;
}
}
#endregion
#region UVs
/*
Uvs = new Vector2[vertices.Length];
for (int i = 0, z = 0; z <= zSize; z++)
{
for (int x = 0; x <= xSize; x++)
{
Uvs[i] = new Vector2((float)x / xSize, (float)z / zSize);
i++;
}
}
*/
#endregion
}
#endregion
#region Octaves Calculation
float Calculate(float x, float z)
{
float[] octaveFrequencies = new float[] { Frequency_01, Frequency_02, Frequency_03, Frequency_04, Frequency_05, Frequency_06 };
float[] octaveAmplitudes = new float[] { FreqAmp_01, FreqAmp_02, FreqAmp_03, FreqAmp_04, FreqAmp_05, FreqAmp_06 };
float y = 0;
for (int i = 0; i < Octaves; i++)
{
y += octaveAmplitudes[i] * Mathf.PerlinNoise(
octaveFrequencies[i] * x + offsetX * Scale,
octaveFrequencies[i] * z + offsetY * Scale) ;
}
return y;
}
#endregion
#region UpdateMesh
void UpdateMesh()
{
mesh.Clear();
mesh.vertices = vertices;
mesh.triangles = triangles;
mesh.colors = colors;
//mesh.uv = Uvs;
mesh.RecalculateNormals();
}
#endregion
#region Gizmos
/*
private void OnDrawGizmos()
{
if (vertices == null)
return;
for (int i = 0; i < vertices.Length; i++){
Gizmos.DrawSphere(vertices[i], .1f);
}
}
*/
#endregion
}
下面的 link 是我目前的结果和我正在努力实现的结果。
用这种方法能达到这样的效果吗?
如果可以的话,可以显示脚本示例吗?
非常感谢。
*再次更新代码
多级或多倍频程 perlin 只是标准 perlin 的几个迭代加在一起。
示例代码可能如下所示:
float[] octaveFrequencies=new float() {1,1.5f,2,2.5f} ;
float[] octaveAmplitudes=new float() {1,0.9f,0.7f,0.f} ;
float y=0;
for(int i=0;i<octaveFrequencies.Length;i++)
y += octaveAmplitudes[i]* Mathf.PerlinNoise(
octaveFrequencies[i]*x + .3f,
octaveFrequencies[i]* z + .3f) * 2f ;
您放入数组中的数字将决定噪声的最终形状。频率数组中的值乘以您的输入,振幅数组中的值乘以该层的结果 perlin。
我正在尝试按照教程在 unity 中设置简单的地形生成器,到目前为止它按预期工作,但我想做更多 "natural" 看看,发现我需要做八度或多级噪音.
我在网上找到的关于多级 Perlin 噪声的所有内容对我来说都无法理解,或者使用了完全不同的方法。
using UnityEngine;
[RequireComponent(typeof(MeshFilter))]
public class Mesh_Generator : MonoBehaviour
{
#region Variables
Mesh mesh;
Vector3[] vertices;
//Vector2[] Uvs;
Color[] colors;
int[] triangles;
[Range(1, 9999)]
public int xSize = 100;
[Range(1, 9999)]
public int zSize = 100;
public Gradient gradient;
public float MinHeight = 0;
public float MaxHeight = 0;
public bool Reset_Min_Max;
#endregion
#region Octaves
[Range(1, 6)]
public int Octaves = 6;
public int Scale = 50;
public float offsetX = 0f;
public float offsetY = 0f;
public float Frequency_01 = 5f;
public float FreqAmp_01 = 3f;
public float Frequency_02 = 6f;
public float FreqAmp_02 = 2.5f;
public float Frequency_03 = 3f;
public float FreqAmp_03 = 1.5f;
public float Frequency_04 = 2.5f;
public float FreqAmp_04 = 1f;
public float Frequency_05 = 2f;
public float FreqAmp_05 = .7f;
public float Frequency_06 = 1f;
public float FreqAmp_06 = .5f;
#endregion
#region Start
void Start()
{
mesh = new Mesh();
GetComponent<MeshFilter>().mesh = mesh;
offsetX = Random.Range(0f, 99999f);
offsetY = Random.Range(0f, 99999f);
}
#endregion
void ResetMinMax()
{
MinHeight = 0f;
MaxHeight = 0f;
Reset_Min_Max = false;
}
#region Update
private void Update()
{
if (Reset_Min_Max)
ResetMinMax();
CreateShape();
UpdateMesh();
}
#endregion
#region CreateShape
void CreateShape()
{
#region Vertices
vertices = new Vector3[(xSize + 1) * (zSize + 1)];
for (int i = 0, z = 0; z <= zSize; z++)
{
for (int x = 0; x <= xSize; x++)
{
float y = Calculate(x, z);
vertices[i] = new Vector3(x, y, z);
if (y > MaxHeight)
MaxHeight = y;
if (y < MinHeight)
MinHeight = y;
i++;
}
}
int vert = 0;
int tris = 0;
#endregion
#region Triangles
triangles = new int[xSize * zSize * 6];
for (int z = 0; z < zSize; z++)
{
for (int x = 0; x < xSize; x++)
{
triangles[tris + 0] = vert + 0;
triangles[tris + 1] = vert + xSize + 1;
triangles[tris + 2] = vert + 1;
triangles[tris + 3] = vert + 1;
triangles[tris + 4] = vert + xSize + 1;
triangles[tris + 5] = vert + xSize + 2;
vert++;
tris += 6;
}
vert++;
}
#endregion
#region Gradient Color
colors = new Color[vertices.Length];
for (int i = 0, z = 0; z <= zSize; z++)
{
for (int x = 0; x <= xSize; x++)
{
float Height = Mathf.InverseLerp(MinHeight, MaxHeight, vertices[i].y);
colors[i] = gradient.Evaluate(Height);
i++;
}
}
#endregion
#region UVs
/*
Uvs = new Vector2[vertices.Length];
for (int i = 0, z = 0; z <= zSize; z++)
{
for (int x = 0; x <= xSize; x++)
{
Uvs[i] = new Vector2((float)x / xSize, (float)z / zSize);
i++;
}
}
*/
#endregion
}
#endregion
#region Octaves Calculation
float Calculate(float x, float z)
{
float[] octaveFrequencies = new float[] { Frequency_01, Frequency_02, Frequency_03, Frequency_04, Frequency_05, Frequency_06 };
float[] octaveAmplitudes = new float[] { FreqAmp_01, FreqAmp_02, FreqAmp_03, FreqAmp_04, FreqAmp_05, FreqAmp_06 };
float y = 0;
for (int i = 0; i < Octaves; i++)
{
y += octaveAmplitudes[i] * Mathf.PerlinNoise(
octaveFrequencies[i] * x + offsetX * Scale,
octaveFrequencies[i] * z + offsetY * Scale) ;
}
return y;
}
#endregion
#region UpdateMesh
void UpdateMesh()
{
mesh.Clear();
mesh.vertices = vertices;
mesh.triangles = triangles;
mesh.colors = colors;
//mesh.uv = Uvs;
mesh.RecalculateNormals();
}
#endregion
#region Gizmos
/*
private void OnDrawGizmos()
{
if (vertices == null)
return;
for (int i = 0; i < vertices.Length; i++){
Gizmos.DrawSphere(vertices[i], .1f);
}
}
*/
#endregion
}
下面的 link 是我目前的结果和我正在努力实现的结果。
用这种方法能达到这样的效果吗? 如果可以的话,可以显示脚本示例吗?
非常感谢。
*再次更新代码
多级或多倍频程 perlin 只是标准 perlin 的几个迭代加在一起。 示例代码可能如下所示:
float[] octaveFrequencies=new float() {1,1.5f,2,2.5f} ;
float[] octaveAmplitudes=new float() {1,0.9f,0.7f,0.f} ;
float y=0;
for(int i=0;i<octaveFrequencies.Length;i++)
y += octaveAmplitudes[i]* Mathf.PerlinNoise(
octaveFrequencies[i]*x + .3f,
octaveFrequencies[i]* z + .3f) * 2f ;
您放入数组中的数字将决定噪声的最终形状。频率数组中的值乘以您的输入,振幅数组中的值乘以该层的结果 perlin。