Advanced Search. The simplicity of tcl's command based nature makes it nice and easy to use in Nuke's text knobs, such as labels you can actually use tcl that way in pretty much any knob in Nuke that can take an expression.
The value and knob commands in particular are very handy to show node properties in the DAG. In a node's label, simply type the following: 1 [value Using Eclipse with Nuke. Though the Nuke script editor has been improved recently, it's still worth looking for alternatives.
Eclipse adds lots of extra features like auto completion, syntax checking or source exploration to make daily tasks Noise Curve.
Learn how to randomize your curves using expressions controlled by knobsRandom noise as a curve is something I use all the time for all sorts of things. Here is an expression which uses Nuke's noise function to generate random noise along a curve. I use this to drive random flicker, luminance shifts, transforms or even camera float or film weave.
Getting the index context of a Knob. If, for example, you call a command in the Animation menu by right clicking on translate.
I often need to run code from within a group or gizmo instead of the top level so nuke.
Working with Pipe Numbers. Understand pipe numbers and their order when creating groups and custom tools. To label the input pipes of a Understanding Nuke's unique Layer and Channel system includ. Understanding Nuke's layers and channels.
One of Nuke's unique features is its 'Multi-channel, high dynamic range compositing system'. What this means is that Nuke can handle over a thousand 'Channels' of data; red, green, blue and alpha would be counted as 4 'Channels' out of a possible available.
Speed matters, 10 tips to make your scripts fly. B PIPE Keep every layer operation piping in to the B pipe stream your main branch - this means, among other benefits, you can dissable the merge and the image stream will still flow. RenderManager - BackBurner. Use Backburner to render your Nuke scripts with nuke2backburner.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The file command is what you want. Learn more. Asked 4 years, 6 months ago. Active 4 years, 6 months ago. Viewed 8k times. Dexygen Bryan Bryan 4 4 silver badges 11 11 bronze badges.
Active Oldest Votes. Brad Lanam Brad Lanam 4, 2 2 gold badges 15 15 silver badges 24 24 bronze badges. Hi, is there a fast way of doing the same thing in shell script? Instead of using 'cut' command? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The Overflow How many jobs can be done at home? Socializing with co-workers while Social distancing.
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Unzip contents into your Maya projects directory. Produced using the following software versions. This is really just quick reference for myself. Short example for creating atmospheric lighting effects in Renderman. Nuke makes an appearance at the end to do some relighting.
Example using Depth of Field in Nuke with a Renderman image. Basic idea is to put the data in the red channel, normalize it between zero and one, then make sure the green and blue channel are both set to one and convert the colourspace from HSV to Linear. Blackpoint and Whitepoint are set to the minimum and maximum samples from the render. Gain is set to 0. Step two. Enter in the following TCL expression. This is more a reminder for myself, as I can never remember the syntax for outputting values to Text nodes in Nuke.
Often use this when doing wedge renders during lookdev. A wedge render is a render where you render several frames of the same thing but only change a few specific values to see what effect the change has.
Maya New video up on generating masks mattes in Renderman for Maya. PxrSurface, pym. PxrLayerSurface : mybxdfs.
PxrMarschnerHair : myhairs. PxrMatteID : mymatteid. Additional Renderman for Maya info. If you want aliased depth passes. Click on image to enlarge. Also available in Youtube. Useful if you ever want to better visualize data images. Nuke expression reminder to self. Linear to HyperLogGamma and back again. Quick tip. To use custom frame sequences in Nuke… Step one. Enter the frames you want to use, with an image per line. See the printf reference for more details.
I'm using nuke, in case that matters for my code. I could then sub it in. Tcl puts does not return a value. It sounds like you want Tcl setwhich does. The docs for nuke. Run a tcl command. The arguments must be strings and passed to the command.
If no arguments are given and the command has whitespace in it then it is instead interpreted as a tcl program this is depreciated. Rather than invoking it as a full script, it seems you could both use the non-deprecated version and get the behavior you want by using:. Learn more. Hey python to resolve tcl variable? Nuke Ask Question. Asked 6 years, 11 months ago. Active 5 years, 7 months ago. Viewed 2k times. Can you link us to the docs for nuke. Active Oldest Votes.Expression and TCL snippets for Nuke artists - V1.0
Two things to note: Tcl puts does not return a value. I though set, well, at the variable, not returned it. I've already set the variable elsewhere.
An I wrong?
Displaying Useful Information with Metadata in NUKE
With one argument, set returns the current value of the variable. With two, it sets the new value then returns that. Aghhh okay thanks. Tcl's manual pages are occasionally slightly gnostic, and often pay dividends when read very carefully.
If you think that a specific bit of documentation is too obscure, file a bug report against Tcl so that we know to improve it. When filing, mention the specific page under tcl. They are, however, fundamentally a reference and not a tutorial. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.Nuke makes it really easy to access metadata from incoming images.
You can easily access information from pictures that you shot with your camera or access render stats from CG renderings. This can prove to be really useful in a production environment where you want to make sure that your frames are rendering in a reasonable time without consuming too much memory. This example shows how to access and display that information in Nuke with renderings from Arnold. You can see the metadata of an image with the ViewMetaData node.
This node displays all available metadata from your input. For a full list of what you can do with TCL you can refer to the documentation.
TCL expressions are evaluated in square brackets. As this is averaging the rays of all the pixels it outputs a floating point number. We can convert it to an integer with int. You can do the same thing to display your RAM usage. By default Arnold displays memory usage in Megabytes… Converted to Gigabytes it might be a bit more useful:. The metadata for the render time comes in seconds with Arnold.
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Another thing that I find useful to colorize the output. If you just want a simple heatmap from green to red one way you could do it is to just shift the hue of your text.
Looking at a Hue ramp red has a hue of 0 and green has a hue of 0. So you could put your text in HSV space and offset the red channel to shift your Hue the hue shift in Nuke does not work properly — see HERE and make sure you have your saturation at Your email address will not be published. Notify me of follow-up comments by email.
Notify me of new posts by email. December 17, Uncategorized 1. Comments Leave a Reply Cancel reply Your email address will not be published. October 10, at am. Thank you for sharing this!
Its full of little gems!Open topic with navigation. Each chapter in this section explains in detail a key feature of Nuke. You can use the section to familiarize yourself with the features you are particularly interested in, or to get answers to specific problems that arise during compositing. For information on the features in NukeXsee NukeX. This chapter also covers working with bounding boxes.
This chapter also describes adding motion blur. This chapter also explains how to perform editorial tasks, such as trimming and slipping. Reformatting Elements.
Reformatting Images. Adjusting the Bounding Box. Understanding Channels. Creating Channels and Channel Sets. Calling Channels. Linking Channels Using the Link Menu. Tracing Channels. Renaming Channels. Removing Channels and Channel Sets. Swapping Channels. Layering Images Together with the Merge Node. Generating Contact Sheets. Copying a Rectangle from one Image to Another. Keying with Primatte. Connecting the Primatte Node. Primatte Basic Operation Tutorial.
Sampling Tools. Replacing Spill. Primatte Controls. The Primatte Algorithm. Contact Details. Keying with Keylight. Basic Keying.As it's said it is not a site explaining the Expression node, which if you're interested in I recommend you the Expressions I try to explain things as much as I can.
Feel free to use and share! What is TCL? How to apply them? Linking Expressions. Cloning Nodes. And the first one should look like this:. Adding random number as a value the 'random ' generates numbers between 0 and 1. If frame number is lower than value is 0 else If 'Transform1' translate.
If frame number is the value is else 0. If knob 'asdf' is '0' return "hi" else "bye" - with TCL. If knob 'asdf' is '0' return "hi" else "bye" - with Python. If Text1 node's 'message knob has "Notes:" feature the note else leave empty. Expressions for 'disable' knob. It works well on heavy nodes when you run your render on a renderfarm.
When the script is in use returns 1 else True if the name item exists. Formatting expressions. Using the input values for Crop node. Using the input format in Reformat node. Frame range expressions.
Using range values from input. Using range values from root. Displaying knob value on the node with TCL. You can also define multiple values from one node and can use expressions as value.
Setting keyframe value. After defining the knob the first number is the frame number the second is the value. Showing sampled pixel value with TCL. R: [sample [node ColorWheel5] red ]. R: [sample [node this] red ].