Thank you for your reply.
I know that you designed TvOut to be a system that has to work into the Arduino but I'm working on a project where I would like to use 2 Arduinos and a common RAM.
1 Arduino should do the GPU "jobs" and the other one the CPU "jobs", meaning the the CPU Arduino make the computations and write the result into the RAM, from where the GPU Arduino reads the data to be output on the TV.
I'll get a look to the LucidScience project. Thanks. 