NodeImporter.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
namespace UniGLTF
{
public static class NodeImporter
{
public static GameObject ImportNode(glTFNode node)
{
var nodeName = node.name;
if (!string.IsNullOrEmpty(nodeName) && nodeName.Contains("/"))
{
Debug.LogWarningFormat("node {0} contains /. replace _", node.name);
nodeName = nodeName.Replace("/", "_");
}
var go = new GameObject(nodeName);
//
// transform
//
if (node.translation != null && node.translation.Length > 0)
{
go.transform.localPosition = new Vector3(
node.translation[0],
node.translation[1],
node.translation[2]);
}
if (node.rotation != null && node.rotation.Length > 0)
{
go.transform.localRotation = new Quaternion(
node.rotation[0],
node.rotation[1],
node.rotation[2],
node.rotation[3]);
}
if (node.scale != null && node.scale.Length > 0)
{
go.transform.localScale = new Vector3(
node.scale[0],
node.scale[1],
node.scale[2]);
}
if (node.matrix != null && node.matrix.Length > 0)
{
var m = UnityExtensions.MatrixFromArray(node.matrix);
go.transform.localRotation = m.ExtractRotation();
go.transform.localPosition = m.ExtractPosition();
go.transform.localScale = m.ExtractScale();
}
return go;
}
public class TransformWithSkin
{
public Transform Transform;
public GameObject GameObject { get { return Transform.gameObject; } }
public int? SkinIndex;
}
public static TransformWithSkin BuildHierarchy(ImporterContext context, int i)
{
var go = context.Nodes[i].gameObject;
if (string.IsNullOrEmpty(go.name))
{
go.name = string.Format("node{0:000}", i);
}
var nodeWithSkin = new TransformWithSkin
{
Transform = go.transform,
};
//
// build hierachy
//
var node = context.GLTF.nodes[i];
if (node.children != null)
{
foreach (var child in node.children)
{
context.Nodes[child].transform.SetParent(context.Nodes[i].transform,
false // node has local transform
);
}
}
//
// attach mesh
//
if (node.mesh != -1)
{
var mesh = context.Meshes[node.mesh];
if (mesh.Mesh.blendShapeCount == 0 && node.skin == -1)
{
// without blendshape and bone skinning
var filter = go.AddComponent<MeshFilter>();
filter.sharedMesh = mesh.Mesh;
var renderer = go.AddComponent<MeshRenderer>();
renderer.sharedMaterials = mesh.Materials;
// invisible in loading
renderer.enabled = false;
mesh.Renderers.Add(renderer);
}
else
{
var renderer = go.AddComponent<SkinnedMeshRenderer>();
if (node.skin != -1)
{
nodeWithSkin.SkinIndex = node.skin;
}
renderer.sharedMesh = mesh.Mesh;
renderer.sharedMaterials = mesh.Materials;
// invisible in loading
renderer.enabled = false;
mesh.Renderers.Add(renderer);
}
}
return nodeWithSkin;
}
//
// fix node's coordinate. z-back to z-forward
//
public static void FixCoordinate(ImporterContext context, List<TransformWithSkin> nodes)
{
var globalTransformMap = nodes.ToDictionary(x => x.Transform, x => new PosRot
{
Position = x.Transform.position,
Rotation = x.Transform.rotation,
});
foreach (var x in context.GLTF.rootnodes)
{
// fix nodes coordinate
// reverse Z in global
var t = nodes[x].Transform;
//t.SetParent(root.transform, false);
foreach (var transform in t.Traverse())
{
var g = globalTransformMap[transform];
transform.position = g.Position.ReverseZ();
transform.rotation = g.Rotation.ReverseZ();
}
}
}
public static void SetupSkinning(ImporterContext context, List<TransformWithSkin> nodes, int i)
{
var x = nodes[i];
var skinnedMeshRenderer = x.Transform.GetComponent<SkinnedMeshRenderer>();
if (skinnedMeshRenderer != null)
{
var mesh = skinnedMeshRenderer.sharedMesh;
if (x.SkinIndex.HasValue)
{
if (mesh == null) throw new Exception();
if (skinnedMeshRenderer == null) throw new Exception();
if (x.SkinIndex.Value < context.GLTF.skins.Count)
{
// calculate internal values(boudingBox etc...) when sharedMesh assinged ?
skinnedMeshRenderer.sharedMesh = null;
var skin = context.GLTF.skins[x.SkinIndex.Value];
var joints = skin.joints.Select(y => nodes[y].Transform).ToArray();
if (joints.Any())
{
// have bones
skinnedMeshRenderer.bones = joints;
if (skin.inverseBindMatrices != -1)
{
var bindPoses = context.GLTF.GetArrayFromAccessor<Matrix4x4>(skin.inverseBindMatrices)
.Select(y => y.ReverseZ())
.ToArray()
;
mesh.bindposes = bindPoses;
}
else
{
//
// calc default matrices
// https://docs.unity3d.com/ScriptReference/Mesh-bindposes.html
//
var meshCoords = skinnedMeshRenderer.transform; // ?
var calculatedBindPoses = joints.Select(y => y.worldToLocalMatrix * meshCoords.localToWorldMatrix).ToArray();
mesh.bindposes = calculatedBindPoses;
}
}
else
{
// BlendShape only ?
}
skinnedMeshRenderer.sharedMesh = mesh;
if (skin.skeleton >= 0 && skin.skeleton < nodes.Count)
{
skinnedMeshRenderer.rootBone = nodes[skin.skeleton].Transform;
}
}
}
}
}
}
}