Creating a voxel chunk with a VBO - How to translate the coordinates of each block and add it to the VBO chunk?
- by sunsunsunsunsun
Im trying to make a voxel engine similar to minecraft as a little learning experience and a way to learn some opengl.
I have created a chunk class and I want to put all of the vertices for the whole chunk into a single VBO. I was previously only putting each block into a vbo and making a call to render each block.
Anyways, I am a bit confused about how I can translate the coordinates of each block in the chunk when I'm putting all vertices into one vbo.
This is what I have at the moment.
public void putVertices(float tx, float ty, float tz) {
float l_length = 1.0f;
float l_height = 1.0f;
float l_width = 1.0f;
vertexPositionData.put(new float[]{
xOffset + l_length + tx, l_height + ty, zOffset + -l_width + tz,
xOffset + -l_length + tx, l_height + ty, zOffset + -l_width + tz,
xOffset + -l_length + tx, l_height + ty, zOffset + l_width + tz,
xOffset + l_length + tx, l_height + ty, zOffset + l_width + tz,
xOffset + l_length + tx, -l_height + ty, zOffset + l_width + tz,
xOffset + -l_length + tx, -l_height + ty, zOffset + l_width + tz,
xOffset + -l_length + tx, -l_height + ty, zOffset + -l_width + tz,
xOffset + l_length + tx, -l_height + ty, zOffset + -l_width + tz,
xOffset + l_length + tx, l_height + ty, zOffset + l_width + tz,
xOffset + -l_length + tx, l_height + ty,zOffset + l_width + tz,
xOffset + -l_length + tx, -l_height + ty,zOffset + l_width + tz,
xOffset + l_length + tx, -l_height + ty, zOffset + l_width + tz,
xOffset + l_length + tx, -l_height + ty, zOffset + -l_width + tz,
xOffset + -l_length + tx, -l_height + ty,zOffset + -l_width + tz,
xOffset + -l_length + tx, l_height + ty, zOffset + -l_width + tz,
xOffset + l_length + tx, l_height + ty, zOffset + -l_width + tz,
xOffset + -l_length + tx, l_height + ty, zOffset + l_width + tz,
xOffset + -l_length + tx, l_height + ty, zOffset + -l_width + tz,
xOffset + -l_length + tx, -l_height + ty, zOffset + -l_width + tz,
xOffset + -l_length + tx, -l_height + ty,zOffset + l_width + tz,
xOffset + l_length + tx, l_height + ty,zOffset + -l_width + tz,
xOffset + l_length + tx, l_height + ty, zOffset + l_width + tz,
xOffset + l_length + tx, -l_height + ty, zOffset + l_width + tz,
xOffset + l_length + tx, -l_height + ty, zOffset + -l_width + tz
});
}
public void createChunk() {
vertexPositionData = BufferUtils.createFloatBuffer((24*3)*activateBlocks);
Random random = new Random();
for (int x = 0; x < CHUNK_SIZE; x++) {
for (int y = 0; y < CHUNK_SIZE; y++) {
for (int z = 0; z < CHUNK_SIZE; z++) {
if(blocks[x][y][z].getActive()) {
putVertices(x*2.0f, y*2.0f, z*2.0f);
}
}
}
}
Whats any easy way to translate the vertices of each block into its correct position? I was previously using glTranslatef with each call to render block but this wont work now.
What I am doing now also does not work, the blocks all render in stacks on top of each other and it looks like this:
http://i.imgur.com/NyFtBTI.png
Thanks
