OpenGL Heightmap Loader

Question

我检查了一个LibGDX高度图加载器and found one，但我不太确定buildIndices（）代码是如何工作的。我也不确定为什么它只生成一个128 * x * 128的高度图块，任何大于128（例如1024）的东西都会让加载器陷入困境：

1024 chunk

正如您所看到的，山脉有洞，大块的形状呈现为128 * 1024网格

128 chunk

完美无缺的128 * 128块

这是我的代码：

package com.amzoft.game.utils;

import java.util.Arrays;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.Pixmap;

public class HeightmapConverter {

    public int mapWidth, mapHeight;
    private float[] heightMap;
    public float[] vertices;
    public short[] indices;
    private int strength;
    private String heightmapFile;
    private float textureWidth;

    public HeightmapConverter(int mapWidth, int mapHeight, int strength, String heightmapFile)
    {
        this.heightMap = new float[(mapWidth+1) * (mapHeight+1)];
        this.mapWidth = mapWidth;
        this.mapHeight = mapHeight;
        this.vertices = new float[heightMap.length*5];
        this.indices = new short[mapWidth * mapHeight * 6];
        this.strength = strength;
        this.heightmapFile = heightmapFile;

        loadHeightmap();
        createIndices();
        createVertices();
    }

    public void loadHeightmap()
    {
        try{
            FileHandle handle = Gdx.files.internal(heightmapFile);
            Pixmap heightmapImage = new Pixmap(handle);
            textureWidth = (float)heightmapImage.getWidth();
            Color color = new Color();
            int indexToIterate = 0;
            for(int y = 0;  y < mapHeight + 1; y++)
            {
                for(int x = 0; x < mapWidth + 1; x++)
                {
                    Color.rgba8888ToColor(color, heightmapImage.getPixel(x, y));
                    heightMap[indexToIterate++] = color.r;
                }
            }
            handle = null;
            heightmapImage.dispose();
            heightmapImage = null;
            color = null;
            indexToIterate = 0;
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    public void createVertices() 
    {
        int heightPitch = mapHeight + 1;
        int widthPitch = mapWidth + 1;

        int idx = 0;
        int hIdx = 0;

        for(int z = 0; z < heightPitch; z++)
        {
            for(int x = 0; x < widthPitch; x++) 
            {
                vertices[idx+0] = x;
                vertices[idx+1] = heightMap[hIdx++] * strength;
                vertices[idx+2] = z;
                vertices[idx+3] = x/textureWidth;
                vertices[idx+4] = z/textureWidth;
                idx += 5;
            }
        }
    }

    public void createIndices() 
    {
        int idx = 0;
        short pitch = (short)(mapWidth + 1);
        short i1 = 0;
        short i2 = 1;
        short i3 = (short)(1 + pitch);
        short i4 = pitch;

        short row = 0;

        for(int z = 0; z < mapHeight; z++) 
        {
            for(int x = 0; x < mapWidth; x++) 
            {
                indices[idx++] = (short)(i1);
                indices[idx++] = (short)(i2);
                indices[idx++] = (short)(i3);

                indices[idx++] = (short)(i3);
                indices[idx++] = (short)(i4);
                indices[idx++] = (short)(i1);

                i1++;
                i2++;
                i3++;
                i4++;
            }

            row += pitch;
            i1 = row;
            i2 = (short)(row + 1);
            i3 = (short)(i2 + pitch);
            i4 = (short)(row + pitch);
        }
    }

    public String getHeightmapFile()
    {
        return heightmapFile;
    }

}

为什么没有更大的块工作？ createIndices（）（在LibGDX代码中称为buildIndices（））如何工作？

Answer 1

解决方案在这里：http://badlogicgames.com/forum/viewtopic.php?f=11&t=4918#p23683

  

Java short只能保存值[-32768 .. 32767]那个地形网格   使用更多的指数。 256 * 256太多（大约65k）所以你是   只能看到一小部分高度图。

感谢kalle_h的解决方案。