I'm analyzing an rather ancient 3D mesh format (from 1995 or 1996). Inside the files, there are blocks of what I think are vertices.
For example, the following is a direct hex dump from such a part:
7855DAFF 5BE60E00 353D0200 C82D0B00 5BE60E00 353D0200 C82D0B00 5BE60E00 B61AEDFF 7855DAFF 5BE60E00 B61AEDFF 7855DAFF 59D2FDFF 363D0200 C82D0B00 59D2FDFF 363D0200 C82D0B00 59D2FDFF B61AEDFF 7855DAFF 59D2FDFF B61AEDFF
These blocks are introduced by a little header, which has a value that could be the number of vertices that are present in the corresponding data block. For this excerpt, there is a
0x08. Since we have 24 values of 32bit, I think it is safe to assume that these blocks are actual vertices (
0x08 * 3 = 24, with
xyz). Other headers also have this value and their data blocks also have the exact number of
dwords ([value in header] * 3 => number of dwords).
But, now I'm struggling at deciphering the number format that was used. It isn't IEEE754; a friend of mine also pointed out that the hardware that was used these days didn't perform well with floating-point numbers and therefore often fixed-point numbers where used.
So, any idea what kind of format this could be ?