ADD merge operation like in AE

[Ryan Duff]

I know im a noob and will have alot of dumb questions, so PLEASE forgive me.

I have been using AE for years and am trying to work through Nuke 5.01. How can i get a ADD merge operation like in AE?

I figured out how to multiply my AO pass on my diffuse pass. amd then tweak the OA pass with a levels, and everything works great. But for comping my highlight pass, i build a pain in the ass round about hack. dupe the Diffuse pass crank up the gain an tweak out the curves then use my highlight pass as a mask, merge those with the original using my highlight pass as a geometric mask. When all i need is a fricken ADD merge operation!

Is this just one of those composting rules that says ADD IS BAD?

Also, other then CVI is her any other video tutorials for nuke online?

[Jan]

If you know how to Multiply your diffuse then you must have seen the (plus) option under your merge node 🙂 I would read up on the Merge node and its functions to get a better idea. But to answer your question just like you multiply your AO pass to your diffuse pass using a merge (multiply), you would use a merge (plus) for you specular pass or reflection pass. Good luck.

[Austin Bonang]

Thanks for your quick reply. But i tryed that, and the mergePLUS dosen have the look of the add in AE. Using the PLUS looks almost identical to the SCREEN operator. when i get more time i will try to do a A vs. B comp to highlight my problem. Maybe im just an idiot and I’m expecting a difforent result.

Thanks

[felicity remezani]

just clarifying, I think he is looking for an option like in Photoshop or After effects like the “Layer Effects” (Difference, Multiply, Lighten, Darken etc)

[hamid zare]

you are probably comparing an identical operation in different colour spaces. nuke always works in linear space while photoshop (and probably afx) let you work in sRGB.
In other words you have to make sure you work in linear space in ps and afx first before you can compare any operations.

[Austin Bonang]

I stumbled onto the ‘Video save valuse’ in the merge and it looks like that is what im looking for.

I always work in video so i have very little experience in Linear color sapce. I will be rendering out EXR files out of Modo wihich are in linear color space, so im sure there will be more questions to come.

Thanks for the help guys!

[Jan]

@ryanduff 25700 wrote:

Thanks for your quick reply. But i tryed that, and the mergePLUS dosen have the look of the add in AE. Using the PLUS looks almost identical to the SCREEN operator. when i get more time i will try to do a A vs. B comp to highlight my problem. Maybe im just an idiot and I’m expecting a difforent result.

Thanks

…yeah apologies, this would be the only technique I know of that has some sort of transfer modes that are similar other than a Math>Add node. Mr. Rueter knows much more about Nuke than most, I would follow his advice 😉

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