我对VBO，VAO和指数都很陌生。我能够渲染一个立方体，现在我正在尝试渲染一大块立方体。我的目标是慢慢制作一个体素引擎。我的chunk类有问题。由于某种原因，它不会显示任何内容。任何人都可以快速查看，也许可以弄清楚什么是错的，并指出给我？干杯
[tableView reloadData]答案 0 :(得分：2)
我不确定我能提供即时解决方案，因为问题不是很具体，但我可以提供一些可以帮助您解决问题的一般性建议：
使用BufferUtils创建FloatBuffer对象并将数据加载到它们之后，必须在所有这些对象上调用.flip（），以便OpenGL知道它们已准备好使用。 （这很可能是MAIN，可能只是问题）
作为对程序其余部分的一般礼貌，您应该禁用在绘制方法期间启用的任何属性，并取消绑定任何绑定的VAOS。 （我相信在绑定VAO时绑定缓冲区对象时，该缓冲区仅在VAO绑定时绑定。我找不到备份文档，所以为了安全起见我还要取消绑定缓冲区对象在你完成它们之后）
以下是我认为应该为您提供Chunk类的工作实现：
class Chunk {
private int vaoID;
private int vboID;
private int indexID;
public void createChunkVBO() {
FloatBuffer vertices = BufferUtils.createFloatBuffer(16 * 256 * 16 * 3 * 8);
FloatBuffer colors = BufferUtils.createFloatBuffer(16 * 256 * 16 * 4 * 8);
FloatBuffer indices = BufferUtils.createFloatBuffer(16 * 256 * 16 * 24);
// I am assuming that all of this is generated properly
for (int x = 0; x < 16; x++) {
for (int y = 0; y < 256; y++) {
for (int z = 0; z < 16; z++) {
System.out.println(x + ", " + y + ", " + z);
vertices.put(x + World.BLOCK_SIZE);
vertices.put(y);
vertices.put(z + World.BLOCK_SIZE);
vertices.put(x);
vertices.put(y);
vertices.put(z + World.BLOCK_SIZE);
vertices.put(x);
vertices.put(y);
vertices.put(z);
vertices.put(x + World.BLOCK_SIZE);
vertices.put(y);
vertices.put(z);
vertices.put(x + World.BLOCK_SIZE);
vertices.put(y + World.BLOCK_SIZE);
vertices.put(z + World.BLOCK_SIZE);
vertices.put(x);
vertices.put(y + World.BLOCK_SIZE);
vertices.put(z + World.BLOCK_SIZE);
vertices.put(x);
vertices.put(y + World.BLOCK_SIZE);
vertices.put(z);
vertices.put(x + World.BLOCK_SIZE);
vertices.put(y + World.BLOCK_SIZE);
vertices.put(z);
colors.put(1f);
colors.put(0f);
colors.put(0f);
colors.put(1f);
colors.put(1f);
colors.put(0f);
colors.put(0f);
colors.put(1f);
colors.put(1f);
colors.put(0f);
colors.put(0f);
colors.put(1f);
colors.put(1f);
colors.put(0f);
colors.put(0f);
colors.put(1f);
colors.put(1f);
colors.put(0f);
colors.put(0f);
colors.put(1f);
colors.put(1f);
colors.put(0f);
colors.put(0f);
colors.put(1f);
colors.put(1f);
colors.put(0f);
colors.put(0f);
colors.put(1f);
colors.put(1f);
colors.put(0f);
colors.put(0f);
colors.put(1f);
indices.put(0 + x * y * z);
indices.put(1 + x * y * z);
indices.put(2 + x * y * z);
indices.put(3 + x * y * z);
indices.put(4 + x * y * z);
indices.put(5 + x * y * z);
indices.put(2 + x * y * z);
indices.put(3 + x * y * z);
indices.put(1 + x * y * z);
indices.put(3 + x * y * z);
indices.put(7 + x * y * z);
indices.put(5 + x * y * z);
indices.put(0 + x * y * z);
indices.put(3 + x * y * z);
indices.put(4 + x * y * z);
indices.put(7 + x * y * z);
indices.put(0 + x * y * z);
indices.put(1 + x * y * z);
indices.put(6 + x * y * z);
indices.put(7 + x * y * z);
indices.put(4 + x * y * z);
indices.put(5 + x * y * z);
indices.put(6 + x * y * z);
indices.put(7 + x * y * z);
}
}
}
vertices.flip();
colors.flip();
indices.flip();
glGenVertexArrays(vaoID); // Create an id for the VAO
glBindVertexArray(vaoID); // Bind the VAO so it remembers all the Attributes (none right now)
glGenBuffers(vboID); // Create an id for the VBO
glBindBuffer(GL_ARRAY_BUFFER, vboID); // Bind the VBO so we can put data into it
glBufferData(GL_ARRAY_BUFFER, 16 * 256 * 16 * 8 * 7 * Float.SIZE, GL_STATIC_DRAW); // We make an empty buffer with a specific size in bytes
// 8 * 7 * sizeof(float)
// 8 = number of vertices, 7 = xyzrgba
// I have not used subdata like this before so I will assume this is correct.
glBufferSubData(GL_ARRAY_BUFFER, 0, vertices); // Put the vertices at the beginning of the buffer
glBufferSubData(GL_ARRAY_BUFFER, 16 * 256 * 16 * 8 * 3 * Float.SIZE, colors); // Put the colors after the vertices
glGenBuffers(indexID); // Create an id for the Index Buffer
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexID); // Bind the Index Buffer so we can put data into it
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices, GL_STATIC_DRAW); // Store the indices inside the currently bound Index Buffer
}
public void drawChunk() {
glEnableClientState(GL_VERTEX_ARRAY); // Enable the Vertex Array
glEnableClientState(GL_COLOR_ARRAY); // Enable the Color Array
glVertexPointer(3, GL_FLOAT, 0, 0);
glColorPointer(4, GL_FLOAT, 0, 16 * 256 * 16 * 8 * 3 * Float.SIZE); // Position of the colors in the currently bound buffer
glDrawElements(GL_QUADS, 8 * 16 * 256 * 24, GL_UNSIGNED_INT, 0); // Draws the elements from the Index Buffer
}
}
如果您对我所说的任何事情有任何疑问，请随时与我联系。
免责声明：我不是OpenGL或LWJGL的专家。请尽量回答我的答案，因为这些答案几乎完全来自我的教育/个人经历。