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Before using this trick when I was inside the bulb couldn't see anything at all..so this is something..not perfect (maybe wrong) but quick.
To obtain a picture from the inside (using Subblue's script, tacitus, others?), when the camera is inside the bulb, I do something like that:

return max(f,-f);

f is a variable (float) for the standard output (something like 0.5 * log(r) * r / dr).
The thing is the parameter 'Epsilon scale' should be 0..so it's slow..
What do you think?

ps: is there a way to avoid this Epsilon scale?