2nd/10_Wiki/Topic_Programming/DevOps_and_Security/Visual-Effects-VFX.md

id, title, category, status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, verification_status, tags, raw_sources, last_reinforced, github_commit, tech_stack

id	title	category	status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	verification_status	tags	raw_sources	last_reinforced	github_commit	tech_stack
wiki-2026-0508-visual-effects-vfx	Visual Effects (VFX)	10_Wiki/Topics	verified	self	VFX Visual Effects Pipeline CGI	none	A	0.9	applied	vfx cgi rendering compositing usd		2026-05-10	pending	language framework python usd-houdini-nuke

Visual Effects (VFX)

매 한 줄

"매 photoreal pixel 의 industrial pipeline". VFX 는 live-action 또는 fully-CG 의 photoreal imagery 를 modeling/animation/sim/lighting/comp 의 multi-stage pipeline 으로 production. 매 2026 현재 USD (Universal Scene Description) 가 interchange standard, AI-assisted (gen AI rotoscope, neural rendering, Nerf/Gaussian Splatting) 가 mainstream.

매 핵심

매 Pipeline 단계

• Pre-vis: Unreal/Maya 로 shot block-out, camera blocking.
• Modeling/Sculpting: Maya, Blender, ZBrush, Houdini.
• Look-dev: Substance Painter, Mari, USD MaterialX.
• Rigging/Animation: Maya, Blender — keyframe + mocap (Vicon, Xsens, Move.ai).
• FX/Sim: Houdini (pyro/FLIP/Vellum/RBD), Embergen (real-time), Phoenix FD.
• Lighting: Katana, Houdini Solaris, USD-based.
• Rendering: Arnold, Renderman, Karma XPU, Redshift, Octane — path tracing.
• Compositing: Nuke (대세), After Effects (motion graphic), Fusion.

매 2026 modern stack

• USD + Hydra: Pixar 시작, 매 cross-DCC interchange standard.
• MaterialX: shader 의 portable language.
• OpenColorIO (OCIO) v2: color management standard.
• Gaussian Splatting / NeRF: photogrammetry replacement, real-time renderable plates.
• AI rotoscope: Runway / SAM-based, manual roto 시간 90% 단축.
• Generative comp tools: Nuke CopyCat (custom ML node), Nuke Smart Vectors.

매 응용

1. Feature film VFX (Marvel, Avatar, Dune sequels).
2. Episodic streaming (House of the Dragon, Foundation).
3. Virtual production (Mandalorian-style LED volumes — Disguise, ROE).
4. Commercials, music videos.
5. Game cinematics (Riot, Blizzard).

💻 패턴

USD scene composition

# Layered composition: Layout → Anim → FX → Lighting
from pxr import Usd, UsdGeom

stage = Usd.Stage.CreateNew("shot_010_layout.usda")
root = UsdGeom.Xform.Define(stage, "/World")
hero = stage.OverridePrim("/World/Hero")
hero.GetReferences().AddReference("assets/hero/hero.usd")
stage.GetRootLayer().subLayerPaths.append("anim/shot_010_anim.usda")
stage.Save()

Houdini FLIP fluid sim (HScript / Python)

import hou
flip = hou.node("/obj").createNode("dopnet", "flip_sim")
# Configure FLIP solver, container, source
# Cache to .bgeo.sc per frame
sim_cache = flip.createOutputNode("filecache", "cache")
sim_cache.parm("file").set("$HIP/cache/flip_v001/$F4.bgeo.sc")
sim_cache.parm("execute").pressButton()

Nuke comp tree (Python)

import nuke
read = nuke.createNode("Read", "file plates/shot_010.####.exr")
grade = nuke.createNode("Grade", "multiply 1.05")
merge = nuke.createNode("Merge2", "operation over")
write = nuke.createNode("Write",
    "file out/shot_010_v003.####.exr "
    "channels rgba file_type exr datatype 16 bit half")

Gaussian Splatting plate capture

# Process plate footage → 3DGS scene for set extension
python -m gsplat.train \
  --data plates/exterior_paris/ \
  --output gsplat_exterior_v01/ \
  --iterations 30000
# Import .ply into Houdini Solaris / Unreal for relighting

OCIO v2 color transform

import PyOpenColorIO as ocio
config = ocio.Config.CreateFromFile("aces_1.3.ocio")
proc = config.getProcessor("ACES - ACEScg", "Output - Rec.709")
cpu = proc.getDefaultCPUProcessor()
cpu.applyRGB(pixel)

AI roto with SAM2

from sam2.sam2_video_predictor import SAM2VideoPredictor
predictor = SAM2VideoPredictor.from_pretrained("facebook/sam2-hiera-large")
state = predictor.init_state("plate_v001/")
# Click-prompt frame 0, propagate through sequence
predictor.add_new_points(state, frame_idx=0, obj_id=1, points=[[640,360]], labels=[1])
masks = list(predictor.propagate_in_video(state))

매 결정 기준

상황	Approach
Feature film hero asset	Maya + Substance + Arnold/Renderman
Heavy FX (fluid/destruction)	Houdini + Karma XPU
Episodic, fast iteration	Blender + Cycles, USD pipeline
Virtual production	Unreal Engine 5.5 + nDisplay + LED volume
Set extension / digital double	Gaussian Splatting + traditional CG hybrid
Color management	OCIO v2 + ACES 1.3

기본값: USD-centric pipeline + Houdini for FX + Nuke for comp + ACES color + AI-augmented (SAM2 roto, gsplat plates).

🔗 Graph

• 부모: Computer-Graphics
• Adjacent: USD Universal Scene Description · Gaussian-Splatting

🤖 LLM 활용

언제: HScript/Python boilerplate, Nuke node tree generation, USD layer authoring, shot breakdown drafts. 언제 X: artistic look-dev decisions, supervisor-level pipeline design.

❌ 안티패턴

• No version control: shot file overwrite chaos → USD layers + Perforce/SVN + ShotGrid.
• Color space ignorance: sRGB linear mix → ACES + OCIO 강제.
• Render farm without checkpoint: long sim crash 의 zero recovery → simulation cache + autosave.
• Manual roto for everything: 매 SAM2/Runway 로 80% 자동화 가능.
• Skipping pre-vis: shoot 이후 VFX 가 impossible 한 plate 발견 → previs 필수.

🧪 검증 / 중복

• Verified: Pixar USD docs, SideFX Houdini docs, Foundry Nuke docs, ACES Central, VES Handbook of Visual Effects (3rd ed).
• 신뢰도 A.

🕓 Changelog

날짜	변경
2026-05-08	Phase 1
2026-05-10	Manual cleanup — USD/Houdini/Nuke pipeline + AI augmentation