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Use actual floor origin for local-floor

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This commit is contained in:
Manish Goregaokar 2019-12-11 19:10:49 -08:00
parent 322463450d
commit bc1bd22d47
2 changed files with 18 additions and 17 deletions
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31
components/script/dom/xrreferencespace.rs
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@ -10,10 +10,10 @@ use crate::dom::bindings::reflector::{reflect_dom_object, DomObject};
use crate::dom::bindings::root::{Dom, DomRoot};
use crate::dom::globalscope::GlobalScope;
use crate::dom::xrrigidtransform::XRRigidTransform;
use crate::dom::xrsession::{cast_transform, ApiPose, ApiRigidTransform, ApiViewerPose, XRSession};
use crate::dom::xrsession::{cast_transform, ApiPose, ApiViewerPose, XRSession};
use crate::dom::xrspace::XRSpace;
use dom_struct::dom_struct;
use euclid::{RigidTransform3D, Vector3D};
use euclid::RigidTransform3D;
use webxr_api::Frame;
#[dom_struct]
@ -96,7 +96,6 @@ impl XRReferenceSpace {
///
/// Does not apply originOffset, use get_viewer_pose instead if you need it
pub fn get_unoffset_viewer_pose(&self, base_pose: &Frame) -> Option<ApiViewerPose> {
let viewer_pose: ApiViewerPose = cast_transform(base_pose.transform?);
// all math is in column-vector notation
// we use the following equation to verify correctness here:
// get_viewer_pose(space) = get_pose(space).inverse() * get_pose(viewer_space)
@ -105,20 +104,22 @@ impl XRReferenceSpace {
// get_viewer_pose(eye_level) = get_pose(eye_level).inverse() * get_pose(viewer_space)
// = I * viewer_pose
// = viewer_pose
let viewer_pose: ApiViewerPose = cast_transform(base_pose.transform?);
// we get viewer poses in eye-level space by default
Some(viewer_pose)
},
XRReferenceSpaceType::Local_floor => {
// XXXManishearth support getting floor info from stage parameters
// get_viewer_pose(floor_level) = get_pose(floor_level).inverse() * get_pose(viewer_space)
// = Translate(-2).inverse() * viewer_pose
// = Translate(2) * viewer_pose
// = floor_to_native.inverse() * viewer_pose
// = native_to_floor * viewer_pose
let viewer_pose = base_pose.transform?;
let native_to_floor = self
.upcast::<XRSpace>()
.session()
.with_session(|s| s.floor_transform())?;
// assume approximate user height of 2 meters
let floor_to_eye: ApiRigidTransform = Vector3D::new(0., 2., 0.).into();
Some(floor_to_eye.pre_transform(&viewer_pose))
Some(cast_transform(native_to_floor.pre_transform(&viewer_pose)))
},
XRReferenceSpaceType::Viewer => {
// This reference space follows the viewer around, so the viewer is
@ -155,11 +156,11 @@ impl XRReferenceSpace {
Some(RigidTransform3D::identity())
},
XRReferenceSpaceType::Local_floor => {
// XXXManishearth support getting floor info from stage parameters
// Assume approximate height of 2m
// the floor-level space is 2m below the eye-level space, which is (0, 0, 0)
Some(Vector3D::new(0., -2., 0.).into())
let native_to_floor = self
.upcast::<XRSpace>()
.session()
.with_session(|s| s.floor_transform())?;
Some(cast_transform(native_to_floor.inverse()))
},
XRReferenceSpaceType::Viewer => base_pose.transform.map(cast_transform),
_ => unimplemented!(),