UV / ST Maps [Part 2] | Nuke Compositing [Beginner / Intermediate]

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Күн бұрын

A beginner / intermediate tutorial on creating a UV expression in Nuke. Project file below!
In this video, we learn how to bake projections onto a 3d .OBJ, so that we can store the transformation for later. Doing this, we can speed up our nuke compositing workflow, and stick rotoscope shapes / grades onto our scene as necessary.
PART 1 VIDEO:
• UVs and UV Passes in N...
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00:00 Introduction to ST Map Expression
03:22 Blending Morphs
07:29 Projecting ST Maps
13:44 Render settings for ST Map Precomps
15:00 Applying as a projection

Пікірлер: 27

@kevinrosso8649 3 жыл бұрын

You are just simply amazing! Keep on the good work

@gnmeles 2 жыл бұрын

Such an awesome video. Congrats!

@CompositingAcademy 3 жыл бұрын

If you guys have other creative or useful ways that you've used a UV coordinate system, feel free to share in the comments!

@maartenvanderveen5144 3 жыл бұрын

A few months back i found an awesome creative STmap tutorial by hansama. Search on KZfaq 'hansama ST_map fire' He will animate a STmap (x,y) and with different chained Time offsets (roto'ed) and blurred on top of each other --> he will create a smooth wavy effect 👍 And thanks for your tutorial! It made much clear and the noise blend is a neat effect.

@ryangame9515 2 жыл бұрын

great Tut as always :-D

@supaflykai 3 жыл бұрын

These videos are great, really hope you keep uploading. There aren't too many good Nuke channels!

@CompositingAcademy 3 жыл бұрын

Thank you! Yes definitely, I have a lot of ideas for other videos, so more will be coming.

@supaflykai 3 жыл бұрын

@@CompositingAcademy just throwing out an idea - going over zdepth passes and how to properly use them. I find they are super finicky and hard to use, as they come out differently in every render engine and differently sized scenes. Both for fog and defocus! Just a thought ;)

@3djaadu Жыл бұрын

great video.This opens many possibilities..Like we can use this instead of position pass mask or use for texturing in nuke..Thanks a ton

@ronydey2696 2 жыл бұрын

Great

@mcrxsi 3 жыл бұрын

nice

@bliccer9319 3 жыл бұрын

Since you already have the geometry... why would you project the stmap and not just let it wrap around the object? (normal geo input instead of projectnode); depending on the UVlayout of the object it might get split? would it matter though?

@CompositingAcademy 3 жыл бұрын

The reason projecting it is useful in this case is because we can stick things from the cameras perspective. If we were to just use the UVs, we would run into a few problems if we wanted a similar result. There are many pieces of geometry which have different UV layouts for one, so it would be difficult to have things "overlap", for example. Also, we would have to mess around a lot with the placement of that alpha or texture to figure out the right spot to work with out camera angle. By projecting it we can remove all of the unnecessary problems and work directly from the camera's view, stick things where we need quickly, etc. It's a really great technique especially for sticking color grades to different areas of CG environments. Cheers!

@bliccer9319 3 жыл бұрын

@@CompositingAcademy true! the figuring out, though, could be done via the UV map you would get from the scanlinerender node? But I guess the coordinates of the stmap would just fall into crumbles and lets say pixel 1 wouldnt be placed on pixel2. What about projecting it from top instead of cameraview? wouldn't you "work around" the objects?

@CompositingAcademy 3 жыл бұрын

@@bliccer9319 Yep you definitely could! The problem with UV space comes in though when there's multiple pieces of geometry though, because their UV spaces don't align in resolution or placement. For example this hill if it had many pebbles or other objects on it, and you want to wrap an alpha over all of them together. I suppose you could project this ST map from the top down as well. Any projection could be "baked" this way, essentially! The only problem sometimes is when objects have other objects behind them. Nuke's project 3d doesn't do the best occlusion unfortunately.

@akamrezaee 3 жыл бұрын

that was great tip, How about 2d? How we can use this technique in 2d?

@maartenvanderveen5144 3 жыл бұрын

7:09 --> STmap affects the coordinate system of the pixels. If you warp or translate (x,y) your stmap --> your source will be affected the same way. All these things are 2D. The creative way is shown at 3:22, the Blending Morphs. Instead of warping and animating your image by hand, you can dissolve between two key-positions. This is a fast and dynamic solution :).

@actimations 2 жыл бұрын

To create the UV/ST map in the expression you use "(x +.5) / width". why do you add the 0.5?

@CompositingAcademy 2 жыл бұрын

Hey there, There is a bit of filtering that can happen on the image when it's generating the pattern. The center of the bottom left pixel on the grid is [0.5, 0.5]. My understanding is that using a .5 offset sort of fixes a bit of blurring that can happen through cubic filtering when generating this pattern. In general I just keep the expression memorized though, I couldn't fully explain to you the technical details of this image filtering, I only know that that it's necessary in the expression.

@chillsoft Жыл бұрын

@@CompositingAcademy Very cool!

@charlieorcharles 3 жыл бұрын

Great video! do you cover UV manipulation in any of your udemy courses? Cheers!

@CompositingAcademy 3 жыл бұрын

Thanks Charles! At the moment there's some information about UV manipulation in regards to remapping textures with a CG render in my NK303 class, but that's about it. However there's a variety of other CG techniques taught in the classes, that go well into detail as well as a variety of ways to combine techniques. Also, more advanced CG classes are coming in the future that I'm working on currently! Cheers!

@charlieorcharles 3 жыл бұрын

@@CompositingAcademy Thanks for the speedy reply, really enjoying 202/303/404, great refereshers and learning lots of new little tricks Thanks again!

@trytony2169 2 жыл бұрын

Some segments in the video are stamped not adjacent to each other

@totheknee 2 жыл бұрын

14:00 - Why no lossless compression?

@CompositingAcademy 2 жыл бұрын

By having zip compression (the default) sometimes you will see slight wobbling from the ST map that's rendered out. It needs 32 bit but also no compression to have a clean result.