Available options are:

-h / --help

Print this help message and exit.

-v / --version

Print the version number and exit.

Window options (backend GTK+):

--fullscreen

Set window to full-screen (cover whole screen).

--window

Set window to not full-screen.

--geometry WIDTHxHEIGHT<sign>XOFF<sign>YOFF

Set window to not full-screen, and set size and/or position.

--fullscreen-custom WIDTHxHEIGHT

Try to resize the screen to WIDTHxHEIGHT and then set window to full-screen.

--display DISPLAY-NAME

Use given X display name.

--no-limit-fps

Disable FPS limit. Use this, and turn OFF vertical synchonization in your GPU settings, to get maximum FPS.

Full documentation on https://castle-engine.io/curves_tool

castle-curves version 2.0.0. Using Castle Game Engine ( https://castle-engine.io/ ) version 7.0-alpha.2. Compiled with FPC 3.2.2. Platform: Desktop, OS: Linux, CPU: x86_64 (this exe is using 64-bit architecture).

Version: 2.0.0. Started on 2023-04-04 at 10:03:15. Castle Game Engine version: 7.0-alpha.2. Compiled with FPC 3.2.2. Platform: Desktop, OS: Linux, CPU: x86_64 (this exe is using 64-bit architecture).

ZLib detected (version 1.2.13). LibPng detected (version 1.6.39). OpenAL library not found castle-curves 2.0.0