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Compositing
Compositing Green screen & normal footage
Composite Green screen footage:
In content browser, create a folder called Movie → R click → Media → ImgMediaSource, name as Person → Open it: direct Sequence Path to the green screen image sequence files, choose 1st image → Save
R click → Media → Media Texture, name as Person1 → R click → Create Material
→ Open material → set the graph as follow:
(Remark:
-Set Person1 Mat material @L bottom corner: Blend mode to Masked (activate Opacity mask)
-To create “0 node”/constant node, hold down 1, L click, or type constants
Create a plane in the scene, drag the Person1 Material on it (the plane will become invisible)
Add a level Sequence → +Track → Media Track → +Media → click Person Image sequence →
R click on the timeline of Person sequence → Properties, assign Media texture as Person1
The keying should work now but the plane orientation maybe wrong, adjust it
R click on Person1 Material → Create Material Instance → open it, tick Key Color → Open color picker (double click on color bar next to Key colorm use dropper select the green screen color
Play around the Alpha control parameter to see the best keying result on preview
Drag the Material instance on the Plane in the scene
Open the Person1 Material node graph page, change Shading Model (@Detail corner) from Default Lit to Unlit
→ click 0 Node/Constants node to adjust its value, which represents the brightness
Composite Normal footage or want to blend the footage in scene:
Import the wanted BG/blend video (e.g. fog, smoke) in Content Broswer
R click → Create Media Player, tick Video output media texture asset ( a media texture called mediaplayer_video will also be created)
→ Open Mediaplayer, click the imported video file → Save (a video material will be created)
Create a Plane in the scene, adjust its scale xyz as 16,9,1 (to match aspect ratio of the footage)
→ Drag the Video texture on the plane in scene:
→ Open the video material graph, change blend mode to Translucent, tick two Sided
→ unlink the base color from RGB (hotkey, Alt + L click)
Make a graph as follow:
Remark:
-Hold S+ L click to create 2 Parameter nodes, rename as Strength and Opacity
-Set default value of opacity as 0.01, strength as 70 (coz the demo example use the footage as a fog, which blend the Bg together, for normal case, opacity as 1, strength as 0.28, and multiply connect to Base color, not Emissive color)
→ Save
Go to Sequencer → +Track → Media Track → +Media → choose the footage
→ R click on the new media track → Edit Session → Choose the footage at Media Texture
If the plane create shadow on the floor in the scene, select the plane → Detail → Lighting → Untick Cast Shadow
If just need a 2d video input to UE:
after import image sequence and create media player, its material and relevant blueprint graph:
In Sequencer, +Track → Media Track → +Media, select the Image sequence source
→
R click on the imported sequence source on timeline - >properities → media texture: select NewMedi video (Texture)
To brighten the imported video, open the Video Material, connect to Emissive color (if doesn’t work, use the blueprint graph above)
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