Thank you 
blackhornet,
I am able to convert 100% every shadertoy shaders (simple pass or sometimes multi buffered ) big or not only in max 5 minutes for C2 90% of converted are working on C2;
BTW Please Mr 
Ashley ... insert vec3 color to C2 runtime too ..
For C3 it take 5 minutes too but only if no error detected inside any of 3 files ... if so the nightmare start )
Merging the 3 file in one is the best solution ...
I am working on online C2 to C3 fx converter ... really want 1 file instead of 3.
Like you said ... *** If someone want particular c2 fx for C3 i am ready for convert it ... but slowly ***
Thank you again for your plugin converter ;