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use crate::engine::ecs::ComponentId;
use crate::engine::ecs::component::Component;
/// Sits between the avatar body pipeline root and `model_root`.
/// Tracks head yaw and smoothly rotates the body to follow when the
/// relative yaw exceeds `threshold`.
///
/// Topology:
/// ```text
/// TransformForkTRS (body_pipeline)
/// AvatarBodyYawComponent ← this node
/// TransformComponent (model_root, Y-offset + base rotation)
/// GLTFComponent
/// ```
#[derive(Debug, Clone)]
pub struct AvatarBodyYawComponent {
/// Yaw delta (radians) that triggers body rotation. Default: π/4 (45°).
pub threshold: f32,
/// Body rotation rate (radians/sec). Default: 3.0 rad/s.
pub rate: f32,
/// ComponentId of the HMD-driven TransformComponent to read yaw from
/// (`avatar_driven_t` in vr-input). Wired at scene construction.
pub hmd_driven_transform: Option<ComponentId>,
/// Current world-space body yaw (radians). Initialized to π to match the
/// model_root's initial `rotation_euler(0, π, 0)` base flip.
pub(crate) body_yaw: f32,
/// When true, use +Z as the forward axis when extracting yaw from the driven
/// transform's world matrix. Use for desktop/keyboard setups with
/// `InputTransformModeComponent::forward_z()`. Default false = -Z (OpenXR).
pub forward_plus_z: bool,
component: Option<ComponentId>,
}
impl AvatarBodyYawComponent {
pub fn new() -> Self {
Self::default()
}
pub fn with_threshold(mut self, t: f32) -> Self {
self.threshold = t;
self
}
pub fn with_rate(mut self, r: f32) -> Self {
self.rate = r;
self
}
pub fn with_hmd_driven_transform(mut self, id: ComponentId) -> Self {
self.hmd_driven_transform = Some(id);
self
}
/// Override the starting body yaw (radians). Defaults to π to match the vr-input
/// model_root base flip. Set to 0.0 for setups with no base rotation on model_root.
pub fn with_initial_yaw(mut self, yaw: f32) -> Self {
self.body_yaw = yaw;
self
}
/// Use +Z as the forward axis for yaw extraction. Required for desktop setups
/// using `InputTransformModeComponent::forward_z()`.
pub fn with_forward_plus_z(mut self) -> Self {
self.forward_plus_z = true;
self
}
}
impl Default for AvatarBodyYawComponent {
fn default() -> Self {
Self {
threshold: std::f32::consts::FRAC_PI_4,
rate: 3.0,
hmd_driven_transform: None,
body_yaw: std::f32::consts::PI,
forward_plus_z: false,
component: None,
}
}
}
impl Component for AvatarBodyYawComponent {
fn name(&self) -> &'static str {
"avatar_body_yaw"
}
fn set_id(&mut self, id: ComponentId) {
self.component = Some(id);
}
fn init(&mut self, emit: &mut dyn crate::engine::ecs::SignalEmitter, component: ComponentId) {
emit.push_intent_now(
component,
crate::engine::ecs::IntentValue::RegisterAvatarBodyYaw {
component_ids: vec![component],
},
);
}
fn as_any(&self) -> &dyn std::any::Any {
self
}
fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
self
}
fn to_mms_ast(
&self,
_world: &crate::engine::ecs::World,
) -> crate::scripting::ast::ComponentExpression {
use crate::engine::ecs::component::ce_helpers::*;
let mut c = ce("AvatarBodyYaw")
.with_call("threshold", vec![num(self.threshold as f64)])
.with_call("rate", vec![num(self.rate as f64)]);
if self.forward_plus_z {
c = c.with_call("forward_plus_z", vec![]);
}
c
}
}