Hi,

You need to enable Use Billboards if you want Aximmetry to generate shadows for tracked cameras:

You can read more about it here: https://aximmetry.com/learn/tutorials/for-studio-operators/setting-up-virtual-sets-with-tracked-cameras/#talent-coverage-using-the-billboards

Of course, you can also key out the shadows instead of generating them. Here is a documentation on how to cut out shadows with Aximmetry's Advanced B keyer: https://aximmetry.com/learn/tutorials/for-studio-operators/using-the-advanced-b-keyer/#cut-out-with-shadow 

Warmest regards,

@Rain_Law: The Aximmetry keyer can certainly keep the real shadows of the keyed shot object, but you need a very evenly lit green screen. Consider that the variance in luminance on the green screen need to be less than the variance between the object and the shadow it casts. You should also light your object to actually cast a shadow.