Demo — inputs & output
Prompt structure inspired by Inspired by fal.ai H3 Guide
Green-Screen Environment Replacement
Swap green-screen background for a new environment with matched perspective and spill cleanup.
Who this is for
Virtual production and location fixes.
How this prompt is built
Read this first — once you see the pattern, you can write your own without starting from zero.
- Edit instruction
Environment swap scope.
- Relight
Spill removal + integration.
Adapt it for your project
- Name target environment (forest, office, etc.).
- Provide still for sky lock.
Where people mess up
- Floating subject scale mismatch.
- Ignoring subject shadow on new ground.
Full prompt (copy & edit)
Replace the green-screen background in the reference video with a photoreal urban night street environment. Match horizon line and camera parallax. Relight subject edges to remove green spill while keeping original performance and wardrobe unchanged.
New to Ref2VA? Read the MiniMax H3 Ref2VA prompt guide
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