[adwood53]

Problem

Currently, the CLI always outputs files as compressed.glb, making batch processing difficult as each file overwrites the previous output.

Solution

This PR adds automatic filename generation based on input files, with an optional flag to override the behaviour.

What Changed

• Added --filename / -f flag for custom output names
• Auto-generates output filename from input when flag not provided (e.g., model.glb → model_optimized.glb)
• Updated README with new usage examples
• Fully backwards compatible

Usage

Default (auto-generate):

gltf-optimizer -i car.glb -o ./output
# Outputs: car_optimized.glb
gltf-optimizer -i car.glb -o ./output -f custom.glb
# Outputs: custom.glb
gltf-optimizer -i car.glb -o ./output -f compressed.glb
# Outputs: compressed.glb (original behaviour)

[juunini]

Thanks for your contribution