static bool HandleBegin(string id, Pose& pose, Bounds handle, bool drawHandle, UIMove moveType, UIGesture allowedGestures)

This begins a new UI group with its own layout! Much like a window, except with a more flexible handle, and no header. You can draw the handle, but it will have no text on it. The pose value is always relative to the current hierarchy stack. This call will also push the pose transform onto the hierarchy stack, so any objects drawn up to the corresponding UI.HandleEnd() will get transformed by the handle pose. Returns true for every frame the user is grabbing the handle.

string id An id for tracking element state. MUST be unique within current hierarchy.
Pose& pose The pose state for the handle! The user will be able to grab this handle and move it around. The pose is relative to the current hierarchy stack.
Bounds handle Size and location of the handle, relative to the pose.
bool drawHandle Should this function draw the handle visual for you, or will you draw that yourself?
UIMove moveType Describes how the handle will move when dragged around.
UIGesture allowedGestures Which hand gestures are used for interacting with this Handle?
RETURNS: bool Returns true for every frame the user is grabbing the handle.


An Interactive Model

A grabbable GLTF Model using UI.Handle

If you want to grab a Model and move it around, then you can use a UI.Handle to do it! Here’s an example of loading a GLTF from file, and using its information to create a Handle and a UI ‘cage’ box that indicates an interactive element.

Model model      = Model.FromFile("DamagedHelmet.gltf");
Pose  handlePose = new Pose(0,0,0, Quat.Identity);
float scale      = .15f;

public void StepHandle() {
	UI.HandleBegin("Model Handle", ref handlePose, model.Bounds*scale);

	Mesh.Cube.Draw(Material.UIBox, Matrix.TS(model.Bounds.center*scale, model.Bounds.dimensions*scale));


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