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java - Java OpenGL / LWJGL 体素纹理

问题描述

我正在按照 YouTube 教程系列进行 3D 渲染项目。我已经使用 OBJ 文件格式渲染 3D 纹理模型。

使用教程提供的模型进行 3D 渲染：

使用教程提供的模型进行 3D 渲染

问题是，当我制作自己的基于体素的模型时，纹理会奇怪地映射到对象。

具有扭曲纹理的简单 2 色体素立方体：

具有扭曲纹理的简单 2 色体素立方体

据我所知，这是某种插值问题，但我对 3D OpenGL 框架不够熟悉，无法确定。

任何帮助将不胜感激。

OBJ文件：

# www.blender.org
mtllib grass2.mtl
o ObjObject
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usemtl palette
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纹理文件：

纹理文件

OBJ加载器：

package Voxel2.renderEngine;

import Voxel2.models.RawModel;
import org.lwjgl.util.vector.Vector2f;
import org.lwjgl.util.vector.Vector3f;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;

public class OBJLoader {

    public static RawModel loadObjModel(String fileName, Loader loader) {
        FileReader fr = null;
        try {
            fr = new FileReader(new File("res/models/" + fileName + ".obj"));
        } catch (FileNotFoundException e) {
            System.err.println("Couldn't load model!");
            e.printStackTrace();
        }
        BufferedReader reader = new BufferedReader(fr);
        String line;
        List<Vector3f> vertices = new ArrayList<>();
        List<Vector2f> textures = new ArrayList<>();
        List<Vector3f> normals = new ArrayList<>();
        List<Integer> indices = new ArrayList<>();
        float[] verticesArray = null;
        float[] normalsArray = null;
        float[] textureArray = null;
        int[] indicesArray = null;

        try {
            while(true) {
                line = reader.readLine();
                String[] currentLine = line.split(" ");
                if (line.startsWith("v ")) {
                    Vector3f vertex = new Vector3f(Float.parseFloat(currentLine[1]), Float.parseFloat(currentLine[2]), Float.parseFloat(currentLine[3]));
                    vertices.add(vertex);
                } else if (line.startsWith("vt ")) {
                    Vector2f texture = new Vector2f(Float.parseFloat(currentLine[1]), Float.parseFloat(currentLine[2]));
                    textures.add(texture);
                } else if (line.startsWith("vn ")) {
                    Vector3f normal = new Vector3f(Float.parseFloat(currentLine[1]), Float.parseFloat(currentLine[2]), Float.parseFloat(currentLine[3]));
                    normals.add(normal);
                } else if (line.startsWith("f ")) {
                    textureArray = new float[vertices.size() * 2];
                    normalsArray = new float[vertices.size() * 3];
                    break;
                }
            }

            while (line != null) {
                if (!line.startsWith("f ")) {
                    line = reader.readLine();
                    continue;
                }
                String[] currentLine = line.split(" ");
                String[] vertex1 = currentLine[1].split("/");
                String[] vertex2 = currentLine[2].split("/");
                String[] vertex3 = currentLine[3].split("/");

                processVertex(vertex1, indices, textures, normals, textureArray, normalsArray);
                processVertex(vertex2, indices, textures, normals, textureArray, normalsArray);
                processVertex(vertex3, indices, textures, normals, textureArray, normalsArray);
                line = reader.readLine();
            }
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        verticesArray = new float[vertices.size() * 3];
        indicesArray = new int[indices.size()];

        int vertexPointer = 0;
        for (Vector3f vertex : vertices) {
            verticesArray[vertexPointer++] = vertex.x;
            verticesArray[vertexPointer++] = vertex.y;
            verticesArray[vertexPointer++] = vertex.z;
        }

        for (int i = 0; i < indices.size(); i ++) {
            indicesArray[i] = indices.get(i);
        }

        return loader.loadToVAO(verticesArray, textureArray, indicesArray);
    }

    private static void processVertex(String[] vertexData, List<Integer> indices, List<Vector2f> textures,
                                      List<Vector3f> normals, float[] textureArray, float[] normalsArray) {
        int currentVertexPointer = Integer.parseInt(vertexData[0]) - 1;
        indices.add(currentVertexPointer);
        Vector2f currentTex = textures.get(Integer.parseInt(vertexData[1]) -1);
        textureArray[currentVertexPointer * 2] = currentTex.x;
        textureArray[currentVertexPointer * 2 + 1] = 1- currentTex.y;
        Vector3f currentNorm = normals.get(Integer.parseInt(vertexData[2]) - 1);
        normalsArray[currentVertexPointer * 3] = currentNorm.x;
        normalsArray[currentVertexPointer * 3 + 1] = currentNorm.y;
        normalsArray[currentVertexPointer * 3 + 2] = currentNorm.z;
    }
}

渲染器：

package Voxel2.renderEngine;

import Voxel2.models.RawModel;
import Voxel2.models.TexturedModel;

import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL13;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
import org.lwjgl.util.vector.Matrix4f;

import Voxel2.shaders.StaticShader;
import Voxel2.toolbox.Maths;

import Voxel2.entities.Entity;

public class Renderer {
    
    private static final float FOV = 70;
    private static final float NEAR_PLANE = 0.1f;
    private static final float FAR_PLANE = 1000;
    
    private Matrix4f projectionMatrix;
    
    public Renderer(StaticShader shader){
        createProjectionMatrix();
        shader.start();
        shader.loadProjectionMatrix(projectionMatrix);
        shader.stop();
    }

    public void prepare() {
        GL11.glEnable(GL11.GL_DEPTH_TEST);
        GL11.glClear(GL11.GL_COLOR_BUFFER_BIT|GL11.GL_DEPTH_BUFFER_BIT);
        GL11.glClearColor(0.3f, 0.3f, 0.3f, 1);
    }

    public void render(Entity entity, StaticShader shader) {
        TexturedModel model = entity.getModel();
        RawModel rawModel = model.getRawModel();
        GL30.glBindVertexArray(rawModel.getVaoID());
        GL20.glEnableVertexAttribArray(0);
        GL20.glEnableVertexAttribArray(1);
        Matrix4f transformationMatrix = Maths.createTransformationMatrix(entity.getPosition(),
                entity.getRotX(), entity.getRotY(), entity.getRotZ(), entity.getScale());
        shader.loadTransformationMatrix(transformationMatrix);
        GL13.glActiveTexture(GL13.GL_TEXTURE0);
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, model.getTexture().getID());
        GL11.glDrawElements(GL11.GL_TRIANGLES, rawModel.getVertexCount(), GL11.GL_UNSIGNED_INT, 0);
        GL20.glDisableVertexAttribArray(0);
        GL20.glDisableVertexAttribArray(1);
        GL30.glBindVertexArray(0);
    }
    
    private void createProjectionMatrix(){
        float aspectRatio = (float) Display.getWidth() / (float) Display.getHeight();
        float y_scale = (float) ((1f / Math.tan(Math.toRadians(FOV / 2f))) * aspectRatio);
        float x_scale = y_scale / aspectRatio;
        float frustum_length = FAR_PLANE - NEAR_PLANE;

        projectionMatrix = new Matrix4f();
        projectionMatrix.m00 = x_scale;
        projectionMatrix.m11 = y_scale;
        projectionMatrix.m22 = -((FAR_PLANE + NEAR_PLANE) / frustum_length);
        projectionMatrix.m23 = -1;
        projectionMatrix.m32 = -((2 * NEAR_PLANE * FAR_PLANE) / frustum_length);
        projectionMatrix.m33 = 0;
    }

}

片段着色器：

#version 150

in vec2 pass_textureCoordinates;

out vec4 out_Color;

uniform sampler2D modelTexture;

void main(void){

    out_Color = texture(modelTexture,pass_textureCoordinates);

}

顶点着色器：

#version 150

in vec3 position;
in vec2 textureCoordinates;

out vec2 pass_textureCoordinates;

uniform mat4 transformationMatrix;
uniform mat4 projectionMatrix;
uniform mat4 viewMatrix;

void main(void){

    gl_Position = projectionMatrix * viewMatrix * transformationMatrix * vec4(position,1.0);
    pass_textureCoordinates = textureCoordinates;
}

标签： javaopengllwjglblenderwavefront

解决方案

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