Did anybody find a suitable transformation of the Gaze ray origin and direction provided by SRanipal_Eye_v2.GetGazeRay() or one of the other SRanipal mechanisms? I really can't find a sane mapping from Gaze origin to some Unity 2020 XRNode or the Main Camera in the SRanipal example scenes.
Without knowing how "System Origin" as posted by @Daniel_Y relates to a SteamVR Camera Rig, Unity XR Nodes, ViveCameraRig, Main Camera or some other known Entity in a Unity Scene it is a tedious guessing game to reliably use the Gaze Origin in the scene. I am also wondering why in SRanipal_Eye_v2.cs line 293 and 304 the x component of the direction gets inverted, but the x component of the origin does not get inverted - is this a bug?
This is my Unity 2020 script to match SRanipal Eye Gaze to the Uniry Head XR Node. Maybe somebody has done that successfully already? I want to match Gaze origin and direction for both yes to world space in the scene. I am using the SRanipal example scenes for testing.
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.XR;
public class XRHeadTest : MonoBehaviour
{
private LineRenderer m_line_renderer_left;
private LineRenderer m_line_renderer_right;
private GameObject left, right;
private GameObject node;
public XRNode tracked_node = XRNode.Head;
void Start()
{
left = new GameObject();
right = new GameObject();
node = new GameObject();
node.name = "TrackedXRNode";
m_line_renderer_left = left.AddComponent<LineRenderer>();
m_line_renderer_left.name = "LeftLine";
m_line_renderer_left.startWidth = 0.001f;
m_line_renderer_left.endWidth = 0.001f;
m_line_renderer_right = right.AddComponent<LineRenderer>();
m_line_renderer_right.name = "RightLine";
m_line_renderer_right.startWidth = 0.001f;
m_line_renderer_right.endWidth = 0.001f;
}
// Update is called once per frame
void Update()
{
List<XRNodeState> nodes = new List<XRNodeState>();
InputTracking.GetNodeStates(nodes);
var xrnode = nodes.Find((XRNodeState state) => state.nodeType == tracked_node);
Vector3 xrnode_pos;
Quaternion xrnode_rot;
if(xrnode.TryGetPosition(out xrnode_pos) && xrnode.TryGetRotation(out xrnode_rot)) {
node.transform.position = xrnode_pos;
node.transform.rotation = xrnode_rot;
ViveSR.anipal.Eye.EyeData_v2 eyedata = new ViveSR.anipal.Eye.EyeData_v2();
var error = ViveSR.anipal.Eye.SRanipal_Eye_API.GetEyeData_v2(ref eyedata);
Vector3 origin, direction;
Action<ViveSR.anipal.Eye.GazeIndex, LineRenderer, ViveSR.anipal.Eye.EyeData_v2> make_line =
(ViveSR.anipal.Eye.GazeIndex index, LineRenderer line, ViveSR.anipal.Eye.EyeData_v2 eye) => {
if(ViveSR.anipal.Eye.SRanipal_Eye_v2.GetGazeRay(index, out origin, out direction, eye)) {
Vector3 pos = node.transform.TransformPoint(origin);
Vector3 dir = node.transform.TransformDirection(direction);
line.SetPosition(0, pos);
line.SetPosition(1, pos + (dir * 10.0f));
}
};
make_line(ViveSR.anipal.Eye.GazeIndex.LEFT, m_line_renderer_left, eyedata);
make_line(ViveSR.anipal.Eye.GazeIndex.RIGHT, m_line_renderer_right, eyedata);
}
}
}
