[Matlab/C/Fortran] writing binary files
 

I'd like to write data to a binary file according to this specification:

http://www.ccim.nl/pics/stltabel.gif

The matlab syntax of fwrite is as follows:
fwrite(fid,A,precision)
where fid is file id, A is a variable and precision takes values similar to C such as 'real*4' for 32 bits floating point.

What I don't understand from reading the docs is how to write values with a given byte length, such as the ascii header. I'm also wondering if I got this right: I have to write 3 floats for each vertex, where one float is 4 bytes long, i.e. 32 bits. Then I use fwrite(fid,A(i),'real*4') and loop through the values?

I know in C I do it by storing all the datamembers into a structure and then doing a fout.write((char*)& structname,sizeof(structname));

If matlab has structs it might make it a lot easier to place your data into a structure then read/write entire structures at a time

Yes, Matlab has structs. I've been trying different things now, but I can't create a valid file. I'm stuck with ascii for now, which is sloow :(