【发布时间】：2013-06-30 17:20:19
【问题描述】：
我查遍了整个互联网并研究了 Perlin 噪声，但是我仍然感到困惑。
我正在使用 java 和 libgdx。我有一个 Perlin 类可以工作并产生噪音，但我不确定它给出的值是否正确。如何检查它实际上是在输出 Perlin 噪声？
如果我的实现是正确的，我不知道从那里去哪里制作随机地形。我如何将 Perlin 噪声映射到图块？目前我有 4 个基本图块；水、沙子、岩石和草。
package com.bracco.thrive.world;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.Texture;
public class WorldGeneration {
Perlin noise = new Perlin();
private SpriteBatch spriteBatch;
//private boolean debug = false;
private TextureRegion[] regions = new TextureRegion[4];
private Texture texture;
float x = 110;
float y = 120;
float originX = 0;
float originY = 16;
float width = 16;
float height = 16;
float scaleX = 1;
float scaleY = 1;
float rotation = 1;
@SuppressWarnings("static-access")
public void createWorld(){
spriteBatch = new SpriteBatch();
texture = new Texture(Gdx.files.internal("assets/data/textures/basictextures.png"));
regions[0] = new TextureRegion(texture,0,0,16,16); //grass
regions[1] = new TextureRegion(texture,16,0,16,16); //water
regions[2] = new TextureRegion(texture,0,17,16,16); //sand
regions[3] = new TextureRegion(texture,17,17,16,16); //rock
float[][] seed = noise.GenerateWhiteNoise(50, 50);
for (int i = 0;i < seed.length; i++){
for ( int j = 0; j < seed[i].length; j++){
System.out.println(seed[i][j] + " ");
}
}
float[][] seedE = noise.GenerateSmoothNoise( seed, 6);
for (int i = 0;i < seedE.length; i++){
for ( int j = 0; j < seedE[i].length; j++){
System.out.println(seedE[i][j] + " ");
}
}
float[][] perlinNoise = noise.GeneratePerlinNoise(seedE, 8);
for (int i = 0;i < perlinNoise.length; i++){
for ( int j = 0; j < perlinNoise[i].length; j++){
System.out.println(perlinNoise[i][j] + " ");
}
}
}
public void render(){
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
spriteBatch.begin();
//spriteBatch.draw(texture, 0, 0, 16, 16);
for (int i = 0; i < regions.length; i++){
spriteBatch.draw(regions[i],75 * (i + 1),100);
}
spriteBatch.end();
}
}
package com.bracco.thrive.world;
import java.util.Random;
public class Perlin {
public static float[][] GenerateWhiteNoise(int width,int height){
Random random = new Random((long) (Math.round(Math.random() * 100 * Math.random() * 10))); //Seed to 0 for testing
float[][] noise = new float[width][height];
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++){
noise[i][j] = (float)(Math.random() % 1);
}
}
return noise;
}
float[][] GenerateSmoothNoise(float[][] baseNoise, int octave)
{
int width = baseNoise.length;
int height = baseNoise.length;
float[][] smoothNoise = new float[width][height];
int samplePeriod = 1 << octave; // calculates 2 ^ k
float sampleFrequency = 1.0f / samplePeriod;
for (int i = 0; i < width; i++)
{
//calculate the horizontal sampling indices
int sample_i0 = (i / samplePeriod) * samplePeriod;
int sample_i1 = (sample_i0 + samplePeriod) % width; //wrap around
float horizontal_blend = (i - sample_i0) * sampleFrequency;
for (int j = 0; j < height; j++)
{
//calculate the vertical sampling indices
int sample_j0 = (j / samplePeriod) * samplePeriod;
int sample_j1 = (sample_j0 + samplePeriod) % height; //wrap around
float vertical_blend = (j - sample_j0) * sampleFrequency;
//blend the top two corners
float top = Interpolate(baseNoise[sample_i0][sample_j0],
baseNoise[sample_i1][sample_j0], horizontal_blend);
//blend the bottom two corners
float bottom = Interpolate(baseNoise[sample_i0][sample_j1],
baseNoise[sample_i1][sample_j1], horizontal_blend);
//final blend
smoothNoise[i][j] = Interpolate(top, bottom, vertical_blend);
}
}
return smoothNoise;
}
float Interpolate(float x0, float x1, float alpha)
{
return x0 * (1 - alpha) + alpha * x1;
}
float[][] GeneratePerlinNoise(float[][] baseNoise, int octaveCount)
{
int width = baseNoise.length;
int height = baseNoise[0].length;
float[][][] smoothNoise = new float[octaveCount][][]; //an array of 2D arrays containing
float persistance = 0.5f;
//generate smooth noise
for (int i = 0; i < octaveCount; i++)
{
smoothNoise[i] = GenerateSmoothNoise(baseNoise, i);
}
float[][] perlinNoise = new float[width][height];
float amplitude = 1.0f;
float totalAmplitude = 0.0f;
//blend noise together
for (int octave = octaveCount - 1; octave >= 0; octave--)
{
amplitude *= persistance;
totalAmplitude += amplitude;
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
perlinNoise[i][j] += smoothNoise[octave][i][j] * amplitude;
}
}
}
//normalisation
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
perlinNoise[i][j] /= totalAmplitude;
}
}
return perlinNoise;
}
}
【问题讨论】：
-
您遇到错误了吗？错误是什么？还是它根本无法按您的预期工作？试着截取你想要的和你实现的。
-
我猜你的问题是你想要某种像素着色器用噪声覆盖你的基础纹理 - 我建议你重新表述你的问题更具体。我对像素着色器了解不多，但如果没有它们，我猜你需要用嘈杂的瓷砖创建一个新的纹理。
-
我在你的代码中看不到你实际尝试使用噪音的地方。
-
对不起，我很困惑，我的目标是生成 perlin 噪声，然后用它来渲染随机的 2d 瓦片地图。我基本上迷路了。
-
@user2489897 你的具体问题是什么？柏林噪声可能是错误的，或者您不知道如何将柏林噪声转换为瓷砖？如果您不确定 perlin 噪声是否“正确”，请使用它生成灰度图像（如果这是您的问题，我可以发布代码来实现这一点）并查看它。它应该看起来像从空中看的山丘/山脉
标签： java libgdx noise perlin-noise procedural