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Light and video Setting
Virtual production UE5 (Short)
Green Screen Compositing:
Composure plugin on
Window → Virtual Production → Composure Compositing
Add 2 layer elements
Create Media Player and Media Texture, connect to camlink (Direct X12 not work for camlink)
In Media Plate:
Drag media texture in media source
Open Transform Passes, use dropper to key green color of screen
Create Mat Material:
Para 2D nodes typed 2d Parameters
Name 2 nodes same name as media plate, and cg element
If just for chormkeying, the graph of the material can be simply as:
Then create material instance and use dropper to pick the green color:
In 0010 comp,
Drag Mat Material in Transform Pass
Fine tune Material Parameters in Media plate for cleaner chromakey
For Vive Tracker connection:
Plugin LiveLink, LiveLink XR, and VRStream on
Window → Virtual Production → Live Link
Has to see if the tracker on SteamVR be detected 
Connect Tracker and basestation without HMD
Create a camera child under a created Actor, select subject representation
Use the Engine Content, Live Link BP to control the tracker:
Not work for me...
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