UEVR: Blueprint API
UEVR implements some functions within the Unreal Engine's existing VR Blueprint API. These functions would usually do nothing because the VR plugins are not present. UEVR implements these functions so modders can easily access HMD and controller data without having to write a C++ plugin.
This should be more familiar to modders, and easier to use than the C++ API. Normal game developers should feel right at home as well.
It should be noted that generating the uproject for interacting with these games is out of UEVR's scope. There are other tools to assist in this, and others may have already generated one somewhere.
UE4SS can assist in generating projects for blueprints.
Official modding tools by the game developers can work here too, if they provide a working uproject.
Automatically handled components
Motion Controller components
When UObjectHook is activated
All UMotionControllerComponent ("Motion Controller") components will have their location and rotation set correctly to the world transform of the user's motion controllers.
This means you can make Motion Controller components in Blueprint and UEVR will handle it for you, as long as you enable UObjectHook. You can then do any logic you wish with the Motion Controller transforms, like parenting a weapon mesh to one of them.
You must correctly set the Motion Source name to either Left or Right. Case sensitive. Or modify the Hand property on older UE versions.
Implemented functions
Tested and confirmed working on 4.27 and 5.0.3
Load Blueprint Code in the UEVR menu must be turned on or one of the head/controller aiming options must be enabled for these to work.
Some functions explicitly require Load Blueprint Code to be enabled, not just the aiming options.
For more information on these functions, visit the Unreal Engine documentation
Head Mounted Display: Is Head Mounted Display Enabled
Always works on < 4.18. >= 4.18, Load Blueprint Code must be explicitly enabled for this to work.
Head Mounted Display: Get Device Pose
This one only works for the HMD for now. Bit of a hacky implementation, but it works.
Head Mounted Display: Get Orientation And Position
Gets data about the HMD transform. Load Blueprint Code must be explicitly enabled for this to work on >= 4.18.
Head Mounted Display: Get Motion Controller Data
Only works for left and right controller.
Valid, Aim Position, Aim Rotation, Grip Position, Grip Rotation are implemented.
Head Mounted Display: Get XRSystem Flags
Metadata used to inform blueprint about certain things.
enum ECustomSystemFlags : int32_t {
SYSTEMFLAG_NONE = 0,
SYSTEMFLAG_HMD_ACTIVE = 1 << 0,
SYSTEMFLAG_DECOUPLED_PITCH = 1 << 1,
SYSTEMFLAG_OPENXR = 1 << 2,
SYSTEMFLAG_OPENVR = 1 << 3,
SYSTEMFLAG_MOTION_CONTROLLERS_ACTIVE = 1 << 4,
SYSTEMFLAG_LEFT_THUMBREST_ACTIVE = 1 << 5,
SYSTEMFLAG_RIGHT_THUMBREST_ACTIVE = 1 << 6,
SYSTEMFLAG_GAME_AIMING_MODE = 1 << 7,
SYSTEMFLAG_HEAD_AIMING_MODE = 1 << 8,
SYSTEMFLAG_LEFT_CONTROLLER_AIMING_MODE = 1 << 9,
SYSTEMFLAG_RIGHT_CONTROLLER_AIMING_MODE = 1 << 10,
SYSTEMFLAG_TWO_HANDED_LEFT_AIMING_MODE = 1 << 11,
SYSTEMFLAG_TWO_HANDED_RIGHT_AIMING_MODE = 1 << 12,
};
Head Mounted Display: Get HMDData
Untested.