how to make 3d voxel in specific range?

I want to make 3d voxel in specific range and the voxel size is 20m x 20m x 20m.

xmin(longtitude) is 126.3342 and xmax(longitude) is 126.5541 in geographic coordinates.

ymin(latitude) is 37.3792 and ymax(latitude) is 37.5458.

and z origin is 7m.

I found two functions about makinf voxel.

https://kr.mathworks.com/matlabcentral/fileexchange/3280-voxel?s_tid=srchtitle

https://kr.mathworks.com/matlabcentral/fileexchange/6133-fast-indexed-color-voxel?s_tid=srchtitle

Please let me know.

Thanks.

Answer 1

[Tushar]

Hi,

To create a 3D voxel in a specific range with a voxel size of 20m x 20m x 20m, you can use the following steps in MATLAB:

1. Define the range of the voxel by specifying the minimum and maximum values for the x, y, and z coordinates:

xmin = 126.3342;
xmax = 126.5541;
ymin = 37.3792;
ymax = 37.5458;
zorigin = 7;

2. Calculate the number of voxels needed in each direction based on the specified voxel size:

voxelSize = 20;
numVoxelsX = ceil((xmax-xmin)/voxelSize);
numVoxelsY = ceil((ymax-ymin)/voxelSize);
numVoxelsZ = ceil((zorigin+100)/voxelSize); %assuming a height of 100m

3. Create a binary 3D matrix with dimensions equal to the number of voxels in each direction:

voxelMatrix = zeros(numVoxelsX, numVoxelsY, numVoxelsZ);

4. Iterate over the range of the voxel and set the corresponding voxels in the matrix to 1:

for x = 1:numVoxelsX
    for y = 1:numVoxelsY
        for z = 1:numVoxelsZ
            if (xmin+(x-1)*voxelSize <= xmax && ymin+(y-1)*voxelSize <= ymax && (z-1)*voxelSize >= zorigin)
                voxelMatrix(x,y,z) = 1;
            end
        end
    end
end

The resulting voxelMatrix should now contain a 3D binary representation of the voxel, where voxels that fall within the specified range are set to 1 and voxels outside the range are set to 0.

Note that the functions you mentioned may provide more advanced features such as color indexing or visualization, but the basic steps above should help you create a simple 3D voxel representation of your specified range.

Hope it helps!!