protected virtual void UpdateHandMesh()
{
using (UpdateHandMeshPerfMarker.Auto())
{
if (lastHandMeshInfo == null)
{
return;
}
bool newMesh = handMeshFilter == null;
IMixedRealityInputSystem inputSystem = CoreServices.InputSystem;
MixedRealityHandTrackingProfile handTrackingProfile = inputSystem?.InputSystemProfile != null ? inputSystem.InputSystemProfile.HandTrackingProfile : null;
if (newMesh && handTrackingProfile != null)
{
// Create the hand mesh in the scene and assign the proper material to it
if (handTrackingProfile.SystemHandMeshMaterial.IsNotNull())
{
handMeshFilter = new GameObject("System Hand Mesh").EnsureComponent <MeshFilter>();
handMeshFilter.EnsureComponent <MeshRenderer>().material = handTrackingProfile.SystemHandMeshMaterial;
}
#pragma warning disable 0618
else if (handTrackingProfile.HandMeshPrefab.IsNotNull())
{
handMeshFilter = Instantiate(handTrackingProfile.HandMeshPrefab).GetComponent <MeshFilter>();
}
#pragma warning restore 0618
// Initialize the hand mesh if we generated it successfully
if (handMeshFilter != null)
{
lastHandMeshVerticesCount = handMeshFilter.mesh.vertices.Length;
handMeshFilter.transform.parent = transform;
}
}
if (handMeshFilter != null)
{
Mesh mesh = handMeshFilter.mesh;
bool meshChanged = false;
// On some platforms, mesh length counts may change as the hand mesh is updated.
// In order to update the vertices when the array sizes change, the mesh
// must be cleared per instructions here:
// https://docs.unity3d.com/ScriptReference/Mesh.html
if (lastHandMeshVerticesCount != lastHandMeshInfo.vertices?.Length)
{
meshChanged = true;
mesh.Clear();
}
mesh.vertices = lastHandMeshInfo.vertices;
mesh.normals = lastHandMeshInfo.normals;
lastHandMeshVerticesCount = lastHandMeshInfo.vertices != null ? lastHandMeshInfo.vertices.Length : 0;
if (newMesh || meshChanged)
{
mesh.triangles = lastHandMeshInfo.triangles;
if (lastHandMeshInfo.uvs?.Length > 0)
{
mesh.uv = lastHandMeshInfo.uvs;
}
}
if (meshChanged)
{
mesh.RecalculateBounds();
}
handMeshFilter.transform.SetPositionAndRotation(lastHandMeshInfo.position, lastHandMeshInfo.rotation);
}
}
}