从OBJ文件渲染网格时出现问题

Question

从OBJ文件渲染网格时出现问题

Joe*_*oey 0 android opengl-es cube .obj live-wallpaper

我正在调整问题,或者我想要理解OBJ文件中的顶点/索引/面.我想最终以编程方式解析OBJ文件,但首先我需要了解如何手动完成.我正在使用GLWallpaperService(由网络上的开发人员提供)中的示例进行调整来完成此操作.

我遇到的问题是它似乎与他提供的代码一起工作,以生成一个具有不同颜色面的通用立方体,他必须单独实现和绘制.我调整后的代码试图从我从搅拌机输出并插入值的坐标中绘制一个基本的立方体.

public class GLCube {
private final int _nrOfVertices = 8;

private FloatBuffer _vertexBuffer;
private FloatBuffer _normalBuffer;
private ShortBuffer _indiceBuffer;

public GLCube() {
    this.init();
}

private void init() {
    // 3 is the number of coordinates to each vertex.
    _vertexBuffer = BufferFactory.createFloatBuffer(_nrOfVertices * 3);
    _normalBuffer = BufferFactory.createFloatBuffer(18);
    _indiceBuffer = BufferFactory.createShortBuffer(72);

    // Coordinates for the vertexes of the cube.
    float[] vertexCoords = {
            /*
            1f,  1f,  0f,
            0f,  1f,  0f, 
            0f,  0f,  0f, 
            1f,  0f,  0f, 
            1f,  0f, -1f, 
            1f,  1f, -1f, 
            0f,  1f, -1f, 
            0f,  0f, -1f,
            */
            2.195671f, -0.176713f, -1.292541f,
            2.195671f, -0.176713f,  0.707459f,
            0.195671f, -0.176713f,  0.707459f,
            0.195672f, -0.176713f, -1.292542f,
            2.195672f,  1.823287f, -1.292541f,
            2.195671f,  1.823287f,  0.707460f,
            0.195671f,  1.823287f,  0.707459f,
            0.195671f,  1.823287f, -1.292541f
    };

    short[] indicesArray = {/*
            0, 1, 2,   0, 2, 3,
            3, 4, 0,   4, 5, 0,
            7, 2, 6,   6, 2, 1,
            4, 7, 5,   7, 6, 5,
            1, 0, 6,   6, 0, 5,
            2, 7, 3,   7, 4, 3
            */
            1,1,2, 1,3,1,
            1,1,3, 1,4,1,
            5,2,8, 2,7,2,
            5,2,7, 2,6,2,
            1,3,5, 3,6,3,
            1,3,6, 3,2,3,
            2,4,6, 4,7,4,
            2,4,7, 4,3,4,
            3,5,7, 5,8,5,
            3,5,8, 5,4,5,
            5,6,1, 6,4,6,
            5,6,4, 6,8,6
            };

    //Coordinates for Normal Vector. Used for Lighting calculations
    float[] normalCoords = {/*
             0f, 0f, 1f,   0f, 0f, 1f,   
             0f, 0f, 1f,   0f, 0f, 1f,   
             0f, 0f, 1f,   0f, 0f, 1f,   
             1f, 0f, 0f,   1f, 0f, 0f,   
             1f, 0f, 0f,   1f, 0f, 0f,   
             1f, 0f, 0f,   1f, 0f, 0f,   
            -1f, 0f, 0f,  -1f, 0f, 0f,  
            -1f, 0f, 0f,  -1f, 0f, 0f,  
            -1f, 0f, 0f,  -1f, 0f, 0f,  
             0f, 0f,-1f,   0f, 0f,-1f,   
             0f, 0f,-1f,   0f, 0f,-1f,   
             0f, 0f,-1f,   0f, 0f,-1f,   
             0f, 1f, 0f,   0f, 1f, 0f,   
             0f, 1f, 0f,   0f, 1f, 0f,   
             0f, 1f, 0f,   0f, 1f, 0f,  
             0f,-1f, 0f,   0f,-1f, 0f,   
             0f,-1f, 0f,   0f,-1f, 0f,   
             0f,-1f, 0f,   0f,-1f, 0f   
             */
             0f, -1f,  0f,
             0f,  1f,  0f,
             1f, -0f,  0f,
            -0f, -0f,  1f,
            -1f, -0f, -0f,
             0f,  0f, -1f
    };

    _vertexBuffer.put(vertexCoords);
    _normalBuffer.put(normalCoords);
    _indiceBuffer.put(indicesArray);

    _indiceBuffer.position(0);
    _vertexBuffer.position(0);
    _normalBuffer.position(0);

}

public void draw(GL10 gl) {
    // 3 coordinates in each vertex
    // 0 is the space between each vertex. They are densely packed in the array, so the value is 0
    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, _vertexBuffer);

    // 0 is the space between each vertex. They are densely packed in the array, so the value is 0
    gl.glNormalPointer(GL10.GL_FLOAT, 0, _normalBuffer);

    gl.glColor4f(1.0f, 0f, 0f, 1f);     //Red
    gl.glDrawElements(GL10.GL_TRIANGLES, 72, GL10.GL_UNSIGNED_SHORT, _indiceBuffer);
}
}

Run Code Online (Sandbox Code Playgroud)

这是Obj文件,也许我只是没有将值放在正确的数组中,但我一直试图弄清楚这一点,老实说,只是没有任何背景使用OpenGL所以这是我的第一个项目试图与它合作.

# Blender v2.58 (sub 1) OBJ File: ''
# www.blender.org
v 2.195671 -0.176713 -1.292541
v 2.195671 -0.176713 0.707459
v 0.195671 -0.176713 0.707459
v 0.195672 -0.176713 -1.292542
v 2.195672 1.823287 -1.292541
v 2.195671 1.823287 0.707460
v 0.195671 1.823287 0.707459
v 0.195671 1.823287 -1.292541
vn 0.000000 -1.000000 0.000000
vn 0.000000 1.000000 0.000000
vn 1.000000 -0.000000 0.000000
vn -0.000000 -0.000000 1.000000
vn -1.000000 -0.000000 -0.000000
vn 0.000000 0.000000 -1.000000
usemtl (null)
s off
f 1//1 2//1 3//1
f 1//1 3//1 4//1
f 5//2 8//2 7//2
f 5//2 7//2 6//2
f 1//3 5//3 6//3
f 1//3 6//3 2//3
f 2//4 6//4 7//4
f 2//4 7//4 3//4
f 3//5 7//5 8//5
f 3//5 8//5 4//5
f 5//6 1//6 4//6
f 5//6 4//6 8//6

Run Code Online (Sandbox Code Playgroud)

任何有关这方面的帮助将非常感激.我留下他的价值评论,所以你可以看到什么有效.我在屏幕上看到的图像是一组完全扭曲的三角形,看起来它试图制作我的立方体,但它并没有完全到达那里.

包含改变内容的答案将是非常棒的. - =)