From bde26764b25a4481add2bf6472d09b4dda9712f3 Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishsmail@gmail.com>
Date: Mon, 1 Jun 2020 17:59:47 -0700
Subject: [PATCH 1/2] Specify the full nature of native and effectve origins

---
 index.bs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/index.bs b/index.bs
index 79d9d0da..8c3fb2bc 100644
--- a/index.bs
+++ b/index.bs
@@ -1098,7 +1098,11 @@ An {{XRSpace}} represents a virtual coordinate system with an origin that corres
 
 Each {{XRSpace}} has a <dfn for="XRSpace">session</dfn> which is set to the {{XRSession}} that created the {{XRSpace}}.
 
-Each {{XRSpace}} has a <dfn for="XRSpace">native origin</dfn> that is tracked by the [=XRSession/XR device=]'s underlying tracking system, and an <dfn for="XRSpace">effective origin</dfn>, which is the basis of the {{XRSpace}}'s <dfn for="XRSpace">coordinate system</dfn>. The transform from the effective space to the [=native origin=]'s space is defined by an <dfn for="XRSpace">origin offset</dfn>, which is an {{XRRigidTransform}} initially set to an [=identity transform=].
+Each {{XRSpace}} has a <dfn for="XRSpace">native origin</dfn> which is a position and orientation in space. The {{XRSpace}}'s [=XRSpace/native origin=] may be updated by the [=XRSession/XR device=]'s underlying tracking system, and different {{XRSpaces}} may define different semantics as to how their [=native origins=] are tracked and updated.
+
+Each {{XRSpace}} has an <dfn for="XRSpace">effective origin</dfn>, which is the basis of the {{XRSpace}}'s <dfn for="XRSpace">coordinate system</dfn>.
+
+The transform from the effective space to the [=native origin=]'s space is defined by an <dfn for="XRSpace">origin offset</dfn>, which is an {{XRRigidTransform}} initially set to an [=identity transform=]. In other words, the [=effective origin=] can be obtained by [=multiply transforms|multiplying=] [=origin offset=] and the [=native origin=].
 
 The [=effective origin=] of an {{XRSpace}} can only be observed in the coordinate system of another {{XRSpace}} as an {{XRPose}}, returned by an {{XRFrame}}'s {{XRFrame/getPose()}} method. The spatial relationship between {{XRSpace}}s MAY change between {{XRFrame}}s.
 

From 0b1b51a4da7abadc7255d0cbe42315f65515ff5e Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishsmail@gmail.com>
Date: Mon, 1 Jun 2020 18:00:25 -0700
Subject: [PATCH 2/2] Copying native origins is not worthwile since they will
 be updated later, copy the type

---
 index.bs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.bs b/index.bs
index 8c3fb2bc..8a552721 100644
--- a/index.bs
+++ b/index.bs
@@ -1227,7 +1227,7 @@ The <dfn method for="XRReferenceSpace">getOffsetReferenceSpace(|originOffset|)</
       <dt> Else
       <dd> Let |offsetSpace| be a [=new=] {{XRReferenceSpace}} in the [=relevant realm=] of |base|.
     </dl>
-  1. Set |offsetSpace|'s [=native origin=] to |base|'s [=native origin=].
+  1. Set |offsetSpace|'s [=XRReferenceSpace/type=] to |base|'s [=XRReferenceSpace/type=].
   1. Set |offsetSpace|'s [=origin offset=] to the result of [=multiply transforms|multiplying=] |base|'s [=origin offset=] by |originOffset| in the [=relevant realm=] of |base|.
   1. Return |offsetSpace|.