The GameSDK UI uses Scaleform, this is based on Adobe Flash.
You can change the crosshair by modifying the file using either Adobe Flash CS6 or alternatively the free Vectorian Giotto/FlashDevelop method.
The original Flash UI assets can be found on GitHub:
https://github.com/CRYTEK/GameSDK/blob/ ... sshair.swf
Documentation regarding UI can be found here:
http://docs.cryengine.com/display/CEMAN ... uick+Start
And specifically for Vectorian giotto:
http://docs.cryengine.com/display/SDKDO ... ashDevelop
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