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vfx_notes

Notes on various shells, shell commands, programs, and resources used in VFX production.

shell

common tools

cat

Read and print a file to the shell.

Print the contents of file.txt:

cat file.txt

For more info:

man cat

chmod

Used to change file permissions. Useful for limiting or sharing access to files.

Set file to execute/read/write access to user only:

chmod 700 /path/to/file

Set file to read/write access to read/write for everyone:

chmod 666 /path/to/file

To change all the directories to 755 (drwxr-xr-x):

find /path/to/file -type d -exec chmod 755 {} \;

To change all the files to 644 (-rw-r--r--):

find /path/to/file -type f -exec chmod 644 {} \;

For more info:

man chmod

cp

Copy a file to a new location or a new name.

Make a copy of an existing file in the same directory:

cp /path/to/file.txt /path/to/newfile.txt

Copy a file to a different directory:

cp /path/to/file.txt /new/path/to/newfile.txt

Copy an entire directory and it's contents to a different directory:

cp -r /path/to/dir /path/to/newdir

For more info:

man cp

ffmpeg

ffmpeg is a video and audio encoder commonly used in vfx

A number of useful examples of generating videos for a vfx pipeline are available here: https://trac.ffmpeg.org/wiki/Encode/VFX

find

Search for files or directories in a filesystem.

Find a file named "demo_reel.mov":

find /path/to/search/ -name "demo_reel.mov"

Find a file with a .mov extension modified in last 2 days:

find /path/to/search/ -mtime -2 -name "*.mov"

Load every QT found into a single RV session:

find /path/to/search/ -mtime -2 -name "*.mov" -exec rv {} +

For more info:

man find

grep

File pattern search tool.

Find every line in a file that contains the text "file" in it:

grep 'file' /path/to/file.nk

Find every line in every log file in a directory that contains the text "render" in it:

grep -r 'render' /path/to/files/*.log

Find the path to every file that contains the text "compositing":

grep -rl 'compositing' /path/to/files/*.log

For more info:

man grep

mv

Move files or directories.

Move file to new location:

mv /source/path/file.txt /dest/path/file.txt

Move folder to new location:

mv /source/path/dir /dest/path/dir

Rename a file:

mv /source/path/file.txt /source/path/new_file.txt

For more info:

man mv

rm

Delete files or directories. Be careful, there is not an "undo".

Delete file:

rm /path/to/file.txt

Delete directory and contents:

rm -r /path/to/dir

For more info:

man rm

rsync

Copy files from or to a local or remote system. Transfers only the differences in files such as a new file or a change in a file. This is very useful for creating backup systems.

Sync a folder and all files and sub-directories from one location to another:

rsync --recursive /path/to/dir/ /path/to/backup/dir/

A day of work has gone by. Let's sync again but only the new or changed files:

rsync --recursive --ignore-existing /path/to/dir/ /path/to/backup/dir/

Another day has gone by. Let's run a test to see which files would be transferred:

rsync --recursive --ignore-existing --dry-run /path/to/dir/ /path/to/backup/dir/

Transfer files to a remote server:

rsync --recursive --ignore-existing /path/to/dir/ user@remote:/path/to/backup/dir/

For more info:

man rsync

ssh

Used for securely logging into remote machines.

Log into remote machine with user "worker":

ssh worker@remote

Use a specific identity key to log into a remote machine:

ssh -i ~/.ssh/remote_key.pem worker@remote

SSH can use a config file to set commonly used configurations. First make the file:

touch ~/.ssh/config

To set our configuration in the file, add this to ~/.ssh/config:

Host remote
	HostName remote
	Port 22
	User pi
	IdentityFile ~/.ssh/remote_key.pem

Now we can login to the remote server with a shorter command:

ssh remote

tar

Used to put data into archive files for security or file transfer.

To compress:

tar -zcvf archive_name.tar.gz folder_to_compress

To extract:

tar -zxvf archive_name.tar.gz

bash

Environment Variables

Setting a basic environment variable:

export TEST_VAR="/some/path"

Running a command to set a variable. In this case, the current directory:

export CURDIR=$(pwd)

Aliases

alias ls_all='ls -l'

tcsh

Environment Variables

setenv TEST_VAR "/some/path"

Aliases

alias ls_all 'ls -l'

Nuke

python

Example of iterating through selected nodes

for n in nuke.selectedNodes():
    print n.name()

Same example but only using a specific node class

for n in nuke.selectedNodes("Camera2"):
    print n.name()

Get current script path

print nuke.root().name()

Get selected node class

print nuke.selectedNode().Class()

Looking through all nodes

for n in nuke.allNodes():
    if n.Class() == "Read":
        print n.name()

Select a node by name

nuke.toNode("Noise1")

Running tcl commands in python

nuke.tcl("value label")

Setting defaults in menu.py or init.py. http://docs.thefoundry.co.uk/nuke/63/pythondevguide/basics.html

nuke.knobDefault("Blur.size", "20")
nuke.knobDefault("Read.exr.compression", "2")

Return an expression on a knob if it eists

if knob.hasExpression():
    origExpression = knob.toScript()

List all knobs on a node

for n in nuke.selectedNodes().knobs():
    print n

Set value on all Read nodes within a selected group

for n in nuke.selectedNodes():
    if n.Class() == "Group":
        for s in n.nodes():
            if s.Class() == "Read":
                s['postage_stamp'].setValue(True)

tcl

Useful expressions and tcl for Nuke

On/Off in GUI mode

$gui
$gui ? 1 : 0
$gui ? 1 : 16 #scanline render

Use python wrapped in tcl

[python nuke.tcl("value gain")]

Check node directly above this one and return some values for a knob:

[value [value input[value 0].name].distortion2] + [value [value input[value 0].name].distortion1]  > 0 ? 1:0

Nuke Random Range between max and min values

(1.1 - .9) * random(t) + .9

Random curve expression

(random(1,frame*1)*1)+0

or just simplified:

random(1,frame)

This creates a curve containing random values between 0 and 1. The breakdown controls:

(random(seed,frame*frequency)*amplitude)+valueOffset

Simple html for label knobs

<font color="red">Some red text</font> # change font color
<font color="blue">Some blue text</font> # a different font color
<font align="left">Left aligned text
<b>Bold text</b> # bold text

Metadata get exr compression type

[metadata exr/compression]

Root dir

[file dirname [knob [topnode].file]]

Filename

[file tail [knob [topnode].file]]

Value of this node's first knob

[value this.first]

Value of the first input's first knob

[value this.input0.first]

Value of the second input's first knob

[value this.input1.first]

Value of top most node in chain's first knob

[value [topnode].first]

Retime a Camera with a Timewarp node named TimeWarp1. Useful when matchmove tracks the plate and then a retime is applied to match editorial. Place this expression on translate, rotate, and focal knobs

curve(TimeWarp1.lookup)

Useful for determining if sharpening is needed on retimes Example with a Timewarp node named Timewarp1

abs(rint(TimeWarp1.lookup)-TimeWarp1.lookup) > 0.15 ? 1:0

Using TCL lindex and split to get a specific portion of a file path In this case we split the directory separator "/" and choose the 3rd item in the resulting list

[ lindex [split [value [topnode].file] / ] 3 ]

Normalize

(value - valuesMin)/(ValuesMax - valuesMin)

Python

Shotgun

All examples using Shotgun's demo projects

Find all project names

sg.find('Project',[],['name'])

Find info on a specific shot

shot = 'bunny_150_0200'
sg.find('Shot', [['project', 'is', {'type': 'Project', 'id': 70}], ['code', 'is', shot]], [ 'code', 'sg_status_list', 'tags', 'sg_sequence'])

Get all shots in a specific sequence

sg.find('Shot', [['project', 'is', {'type': 'Project', 'id': 70}], ['sg_sequence', 'is', {'type': 'Sequence', 'id': 37, 'name': 'bunny_150'}]], ['code', 'sg_sequence', 'tags'])

Resources

Color

https://nick-shaw.github.io/cinematiccolor/cinematic-color.html# http://brucelindbloom.com/ https://opencolorio.org/ https://github.com/AcademySoftwareFoundation/OpenColorIO https://github.com/AcademySoftwareFoundation/OpenColorIO-Config-ACES https://github.com/AcademySoftwareFoundation/openexr-images https://www.colour-science.org/ https://github.com/colour-science https://github.com/colour-science/OpenColorIO-Configs http://mikeboers.com/blog/2013/11/07/linear-raw-conversions https://nick-shaw.github.io/cinematiccolor/full-and-legal-ranges.html https://chrisbrejon.com/cg-cinematography/ https://acescentral.com/ https://www.babelcolor.com/colorchecker.htm

Delivery

https://opencontent.netflix.com/

IT

https://docs.ansible.com/ansible/latest/

Lighting and Lookdev

https://lollypopman.com/lighting-club/ https://academy.substance3d.com/courses/the-pbr-guide-part-1

Math

https://en.wikipedia.org/wiki/Spherical_coordinate_system https://en.wikipedia.org/wiki/Rotation_matrix https://en.wikipedia.org/wiki/Euclidean_distance https://en.wikipedia.org/wiki/Feature_scaling https://en.wikipedia.org/wiki/Quaternion https://en.wikipedia.org/wiki/Transformation_matrix https://en.wikipedia.org/wiki/Sawtooth_wave https://ocw.mit.edu/courses/mathematics/18-06-linear-algebra-spring-2010/video-lectures/

Open Source

https://github.com/FFmpeg/FFmpeg https://github.com/OpenImageIO/oiio https://github.com/AcademySoftwareFoundation https://github.com/AcademySoftwareFoundation/openvdb https://github.com/AcademySoftwareFoundation/openexr https://github.com/NatronGitHub/Natron https://github.com/alembic/alembic https://www.blender.org/

Optics and Cameras

https://en.wikipedia.org/wiki/Circle_of_confusion https://jtra.cz/stuff/essays/bokeh/#what_is_bokeh https://vfxcamdb.com/

Pipeline

https://github.com/pyblish/pyblish-base https://getavalon.github.io/2.0/

Python

https://docs.python-guide.org/

Software

http://vfxplatform.com/

Virtualization

https://github.com/AcademySoftwareFoundation/aswf-docker https://docs.docker.com/develop/develop-images/dockerfile_best-practices/ https://www.codementor.io/@jquacinella/docker-and-docker-compose-for-local-development-and-small-deployments-ph4p434gb

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