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Allow the hips joint to be positioned even if the bone update mode is set to "Rotation Only". Apply appropriate world and skeleton scaling.

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This commit is contained in:
Malcolm Nixon 2024-03-03 20:42:11 -05:00
parent 8fcf385ac5
commit d2db147805
5 changed files with 18 additions and 10 deletions
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4
doc/classes/XRBodyModifier3D.xml
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@ -1,10 +1,12 @@
<?xml version="1.0" encoding="UTF-8" ?>
<class name="XRBodyModifier3D" inherits="Node3D" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<class name="XRBodyModifier3D" inherits="Node3D" experimental="" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<brief_description>
A node for driving body meshes from [XRBodyTracker] data.
</brief_description>
<description>
This node uses body tracking data from a [XRBodyTracker] to animate the skeleton of a body mesh.
This node positions itself at the [constant XRBodyTracker.JOINT_ROOT] position and scales itself to [member XRServer.world_scale]. Adding the body model as a child of this node will result in the model being positioned and scaled correctly for XR experiences.
The body tracking position-data is scaled by [member Skeleton3D.motion_scale] when applied to the skeleton, which can be used to adjust the tracked body to match the scale of the body model.
</description>
<tutorials>
<link title="XR documentation index">$DOCS_URL/tutorials/xr/index.html</link>

2
doc/classes/XRBodyTracker.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="UTF-8" ?>
<class name="XRBodyTracker" inherits="RefCounted" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<class name="XRBodyTracker" inherits="RefCounted" experimental="" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<brief_description>
A tracked body in XR.
</brief_description>

2
doc/classes/XRFaceModifier3D.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="UTF-8" ?>
<class name="XRFaceModifier3D" inherits="Node3D" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<class name="XRFaceModifier3D" inherits="Node3D" experimental="" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<brief_description>
A node for driving standard face meshes from [XRFaceTracker] weights.
</brief_description>

2
doc/classes/XRFaceTracker.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="UTF-8" ?>
<class name="XRFaceTracker" inherits="RefCounted" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<class name="XRFaceTracker" inherits="RefCounted" experimental="" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<brief_description>
A tracked face.
</brief_description>

18
scene/3d/xr_body_modifier_3d.cpp
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@ -311,18 +311,22 @@ void XRBodyModifier3D::_update_skeleton() {
return;
}
// Read the relevant tracking data.
// Get the world and skeleton scale.
const float ws = xr_server->get_world_scale();
const float ss = skeleton->get_motion_scale();
// Read the relevant tracking data. This applies the skeleton motion scale to
// the joint transforms, allowing the tracking data to be scaled to the skeleton.
bool has_valid_data[XRBodyTracker::JOINT_MAX];
Transform3D transforms[XRBodyTracker::JOINT_MAX];
Transform3D inv_transforms[XRBodyTracker::JOINT_MAX];
const float ws = xr_server->get_world_scale();
for (int joint = 0; joint < XRBodyTracker::JOINT_MAX; joint++) {
BitField<XRBodyTracker::JointFlags> flags = tracker->get_joint_flags(static_cast<XRBodyTracker::Joint>(joint));
has_valid_data[joint] = flags.has_flag(XRBodyTracker::JOINT_FLAG_ORIENTATION_VALID) && flags.has_flag(XRBodyTracker::JOINT_FLAG_POSITION_VALID);
if (has_valid_data[joint]) {
transforms[joint] = tracker->get_joint_transform(static_cast<XRBodyTracker::Joint>(joint));
transforms[joint].origin *= ws;
transforms[joint].origin *= ss;
inv_transforms[joint] = transforms[joint].inverse();
}
}
@ -353,7 +357,7 @@ void XRBodyModifier3D::_update_skeleton() {
const int parent_joint = joints[joint].parent_joint;
const Transform3D relative_transform = inv_transforms[parent_joint] * transforms[joint];
// Update the bone position if enabled by update mode, or if the joint is the hips to allow
// Update the bone position if enabled by update mode, or if the joint is the hips, to allow
// for climbing or crouching.
if (bone_update == BONE_UPDATE_FULL || joint == XRBodyTracker::JOINT_HIPS) {
skeleton->set_bone_pose_position(joints[joint].bone, relative_transform.origin);
@ -363,8 +367,10 @@ void XRBodyModifier3D::_update_skeleton() {
skeleton->set_bone_pose_rotation(joints[joint].bone, Quaternion(relative_transform.basis));
}
// Transform to the skeleton pose.
set_transform(transforms[XRBodyTracker::JOINT_ROOT]);
// Transform to the tracking data root pose. This also applies the XR world-scale to allow
// scaling the avatars mesh and skeleton appropriately (if they are child nodes).
set_transform(
transforms[XRBodyTracker::JOINT_ROOT] * ws);
// If tracking-state determines visibility then show the node.
if (show_when_tracked) {