This is a pretty old post, but I'm pretty set on getting this to work:
So is it confirmed that the shaders modding is incompatible with a tekkit version such as 3.1.2 [MC 1.2.5] (the current Rec. Build) ?
I've followed the steps that call for moving the class files from the minecraft.jar to the modpack.jar, but in case I'm doing it incorrectly, this is my process:
-Open both minecraft.jar and modpack.jar with Archive Utility (I'm on a Mac)
-Rename the original .jar files as "minecraft(/modpack)BACKUP.jar"
-Copy the designated ".class" files from the "minecraft.jar "into the "modpack" folder (the archived folder containing the files from the "modpack.jar")
-I then go into the "modpack" folder, select all files, and compress them; this creates a "Archive.zip" file, which I then rename as "modpack.jar" and place in the "bin" folder.
-After these modifications, I open the Shaders "INSTALLER.jar" program thing I downloaded and select "File: Import.." where i select the MC 1.2.5 version of Shaders.n2 file I downloaded from the other page. I target the new "modpack.jar" I created and it seems to install.
But when I open the game I see absolutely no change...*sigh* Please let me know if I've done anything wrong or if I'm just wasting my time and should wait until it's an included option for the game.