[Beta-Tutorial] Custom Effect

Hello!, finally after a vacation I bring you the tutorial about how to make custom effects (≧∇≦)/
I'm sorry for my broken english, I hope you can understand me xD
The first thing I did was find out how the .EDAT files of the DIVA Room Themes work.
(To notice it better it is advisable to see it with 24 columns.)


Well, this is the structure of the .EDAT files:

A- ID: According to the number will be the order of each file.
B- Name order: If these are exchanged, the names of the files also will be exchanged.
C- File size: Indicates the file size in bytes in hexadecimal system.
D- Offset: Indicates when each file begins.

Now that we know this, it's time to edit the .EDAT file, specifically two parts which are: 01_name.txt and 07_room_shf00.igb.
First of all we'll modify 07_room_shf00.igb which is the file that contains the effect.
In this case 07_room_shf00.igb is equivalent to "BC 81" which is equal to 48257 bytes (which equals to 47,126 kilobytes), the file that we want to replace it weighs 87.3 KB (which is equal to 89,448 bytes), since the file it's much larger than that of .EDAT, what we should do is modify the highlighted part in blue that represents the size of 07_room_shf00.igb with the size of the file with which we want to replace it (remember that it has to be in hexadecimal system).



Now it's time to modify 01_name.txt. This is the file that contains the name of the effect, here the file is equivalent to "13" which is equal to 19 bytes that at the same time is equal to the number of characters used in the name.

I will name the effect "Test Effect" that contains 11 characters (spaces and commas also count) that is equal to "B" in hexadecimal system.


The next step is open AFS2EXT For 2nd-2nd #/Extend to rewrite the files that we want to replace, in this case 01_name.txt and 07_room_shf00.igb.


Once we replace both files we only have the last step that is to modify 00_attest.txt, this is the file that contains the letter and the slot of the file, to the letter we will replace it with a "L" and the slot for which that you want.


And once this is done we only need to import the data:




PS: It should be noted that this is a beta tutorial on how to create Custom Effects, there are still several problems to be solved. For some reason some effects look smaller than they should, I'm still working on solving that.

 

The problem with this is that when you change the size of the file you also have to change the offset that is where each file starts which is a bit complicated to do manually but I think that to do this you will need a hexadecimal calculator, unfortunately there is still no program to create DLC Songs I would like to create it but my programming skills are not very good xD