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How do you render the ribbed pats of models like you find in the old ravener tail or the rending claw arms etc... Is this clear enough?

IS there a tut somewhere?

You mean the little gill slits along the limbs of tyranids?

It's a lot easier if you first lay down some putty and press in the ridges using a thin knife, then once that's set, sculpt the flesh around it.

but how would you add the gills if you wanted to just slap some extra detail in somewhere?

Would it be easier to use a knife instead of a scalpel?

Wow I can't believe someone asked this! This is my lucky day! Bio-Titan, I present to you my old two step tutorial.

Materials:
-Blade (a knife will do)
-Greenstuff
-The object its going on
-Water (or another form of lubricant)


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1.)Roll out the GS and put the roughly shaped cylinder on the base. Next, use your knife to cut across it, like in the picture. For larger creatures, or for terrain, ribbing this wide looks good. However, when adding detail to a carnifex or even a gaunt, I recommend making the cuts closer together.


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2.)Now we move onto the flesh around the edges. What I did here was rolled out two pieces of GS roughly the same length as the ribbing. It is important that the edges are nice and sharp, with little beveling. Doing this will make the whole thing look cleaner. Blend the GS into the base using your fingers.

http://i227.photobucket.com/albums/dd26 ... CN0240.jpg

And you are done!

Going Beyond the Tutorial
If you are doing a large amount of ribbing, I'd suggest making a mold at this point. Making a mold for something like this is very easy, because there is only one side to it.







Here is an example of some ribbing painted:
http://i227.photobucket.com/albums/dd26 ... CN0228.jpg

BRILLIANT!

Time to whore me up some green stuff gills...

Mmmm bio-mechanical. Thanks.