Here's the crack for Doom 3 v1.00
It works well for me.

If you don't know how to place a crack:

Step 1: copy the crack

Step 2: Find where you installed Doom 3

Step 3: Paste the crack and replace the other .exe

If anything is wrong or not clear please contact me on [email protected] or write a comment right here

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Personnaly i have the original game, i'm only doing crack for fun and i think
you should buy the original too cause the original is always better than a copy 
of it. I'm making crack to help you play your games.