// Adds a glTF uniform, as described by name, type, and semantic, to the given technique tech. If
    // node is non-null, that is also included (e.g. for lights).
    private void AddUniform(
        IExportableMaterial exportableMaterial,
        string name, GlTF_Technique.Type type,
        GlTF_Technique.Semantic semantic, GlTF_Node node = null)
    {
        //var techName = GlTF_Technique.GetNameFromObject(matObjName);
        var tech = GlTF_Writer.GetTechnique(G, exportableMaterial);

        GlTF_Technique.Parameter tParam = new GlTF_Technique.Parameter();
        tParam.name     = name;
        tParam.type     = type;
        tParam.semantic = semantic;
        if (node != null)
        {
            tParam.node = node;
        }
        tech.parameters.Add(tParam);
        GlTF_Technique.Uniform tUniform = new GlTF_Technique.Uniform();
        tUniform.name  = "u_" + name;
        tUniform.param = tParam.name;
        tech.uniforms.Add(tUniform);
    }
Esempio n. 2
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    public static BoundsDouble Export(string path, Transform[] trs, Transform root, out double minHeight, out double maxHeight)
    {
        minHeight = 0;
        maxHeight = 0;

        writer = new GlTF_Writer();
        writer.Init();

        if (presetAsset != null)
        {
            string psPath = AssetDatabase.GetAssetPath(presetAsset);
            if (psPath != null)
            {
                psPath = psPath.Remove(0, "Assets".Length);
                psPath = Application.dataPath + psPath;
                preset.Load(psPath);
            }
        }

        savedPath = Path.GetDirectoryName(path);
        savedFile = Path.GetFileNameWithoutExtension(path);

        EditorPrefs.SetString(KEY_PATH, savedPath);
        EditorPrefs.SetString(KEY_FILE, savedFile);

        Debug.Log("attempting to save to " + path);
        writer.OpenFiles(path);

        if (rtcScript != null && root != null)
        {
            var instance = Activator.CreateInstance(rtcScript.GetClass());
            var rtc      = instance as RTCCallback;
            if (rtc != null)
            {
                writer.RTCCenter = rtc.GetCenter(root);
            }
        }

        RotationCallback rotCallback = null;;

        if (rotScript != null)
        {
            var instance = Activator.CreateInstance(rotScript.GetClass());
            rotCallback = instance as RotationCallback;
        }

        if (unpackTexture)
        {
            // prepass, for texture unpacker
            TextureUnpacker.Reset();
            foreach (Transform tr in trs)
            {
                TextureUnpacker.CheckPackedTexture(tr, preset);
            }
            TextureUnpacker.Build();
        }

        BoundsDouble bb = new BoundsDouble();

        // first, collect objects in the scene, add to lists
        foreach (Transform tr in trs)
        {
            if (tr.GetComponent <Camera>() != null)
            {
                if (tr.GetComponent <Camera>().orthographic)
                {
                    GlTF_Orthographic cam;
                    cam       = new GlTF_Orthographic();
                    cam.type  = "orthographic";
                    cam.zfar  = tr.GetComponent <Camera>().farClipPlane;
                    cam.znear = tr.GetComponent <Camera>().nearClipPlane;
                    cam.name  = tr.name;
                    //cam.orthographic.xmag = tr.camera.
                    GlTF_Writer.cameras.Add(cam);
                }
                else
                {
                    GlTF_Perspective cam;
                    cam              = new GlTF_Perspective();
                    cam.type         = "perspective";
                    cam.zfar         = tr.GetComponent <Camera>().farClipPlane;
                    cam.znear        = tr.GetComponent <Camera>().nearClipPlane;
                    cam.aspect_ratio = tr.GetComponent <Camera>().aspect;
                    cam.yfov         = tr.GetComponent <Camera>().fieldOfView;
                    cam.name         = tr.name;
                    GlTF_Writer.cameras.Add(cam);
                }
            }

            if (tr.GetComponent <Light>() != null)
            {
                switch (tr.GetComponent <Light>().type)
                {
                case LightType.Point:
                    GlTF_PointLight pl = new GlTF_PointLight();
                    pl.color = new GlTF_ColorRGB(tr.GetComponent <Light>().color);
                    pl.name  = tr.name;
                    GlTF_Writer.lights.Add(pl);
                    break;

                case LightType.Spot:
                    GlTF_SpotLight sl = new GlTF_SpotLight();
                    sl.color = new GlTF_ColorRGB(tr.GetComponent <Light>().color);
                    sl.name  = tr.name;
                    GlTF_Writer.lights.Add(sl);
                    break;

                case LightType.Directional:
                    GlTF_DirectionalLight dl = new GlTF_DirectionalLight();
                    dl.color = new GlTF_ColorRGB(tr.GetComponent <Light>().color);
                    dl.name  = tr.name;
                    GlTF_Writer.lights.Add(dl);
                    break;

                case LightType.Area:
                    GlTF_AmbientLight al = new GlTF_AmbientLight();
                    al.color = new GlTF_ColorRGB(tr.GetComponent <Light>().color);
                    al.name  = tr.name;
                    GlTF_Writer.lights.Add(al);
                    break;
                }
            }

            Mesh m = GetMesh(tr);
            if (m != null)
            {
                GlTF_Mesh mesh = new GlTF_Mesh();
                mesh.name = GlTF_Mesh.GetNameFromObject(m);

                GlTF_Accessor positionAccessor = new GlTF_Accessor(GlTF_Accessor.GetNameFromObject(m, "position"), GlTF_Accessor.Type.VEC3, GlTF_Accessor.ComponentType.FLOAT);
                positionAccessor.bufferView = GlTF_Writer.vec3BufferView;
                GlTF_Writer.accessors.Add(positionAccessor);

                GlTF_Accessor normalAccessor = null;
                if (m.normals.Length > 0)
                {
                    normalAccessor            = new GlTF_Accessor(GlTF_Accessor.GetNameFromObject(m, "normal"), GlTF_Accessor.Type.VEC3, GlTF_Accessor.ComponentType.FLOAT);
                    normalAccessor.bufferView = GlTF_Writer.vec3BufferView;
                    GlTF_Writer.accessors.Add(normalAccessor);
                }

                GlTF_Accessor uv0Accessor = null;
                if (m.uv.Length > 0)
                {
                    uv0Accessor            = new GlTF_Accessor(GlTF_Accessor.GetNameFromObject(m, "uv0"), GlTF_Accessor.Type.VEC2, GlTF_Accessor.ComponentType.FLOAT);
                    uv0Accessor.bufferView = GlTF_Writer.vec2BufferView;
                    GlTF_Writer.accessors.Add(uv0Accessor);
                }

                GlTF_Accessor uv1Accessor = null;
                if (m.uv2.Length > 0)
                {
                    uv1Accessor            = new GlTF_Accessor(GlTF_Accessor.GetNameFromObject(m, "uv1"), GlTF_Accessor.Type.VEC2, GlTF_Accessor.ComponentType.FLOAT);
                    uv1Accessor.bufferView = GlTF_Writer.vec2BufferView;
                    GlTF_Writer.accessors.Add(uv1Accessor);
                }

                GlTF_Accessor uv2Accessor = null;
                if (m.uv3.Length > 0)
                {
                    uv2Accessor            = new GlTF_Accessor(GlTF_Accessor.GetNameFromObject(m, "uv2"), GlTF_Accessor.Type.VEC2, GlTF_Accessor.ComponentType.FLOAT);
                    uv2Accessor.bufferView = GlTF_Writer.vec2BufferView;
                    GlTF_Writer.accessors.Add(uv2Accessor);
                }

                GlTF_Accessor uv3Accessor = null;
                if (m.uv4.Length > 0)
                {
                    uv3Accessor            = new GlTF_Accessor(GlTF_Accessor.GetNameFromObject(m, "uv3"), GlTF_Accessor.Type.VEC2, GlTF_Accessor.ComponentType.FLOAT);
                    uv3Accessor.bufferView = GlTF_Writer.vec2BufferView;
                    GlTF_Writer.accessors.Add(uv3Accessor);
                }

                var smCount = m.subMeshCount;
                for (var i = 0; i < smCount; ++i)
                {
                    GlTF_Primitive primitive = new GlTF_Primitive();
                    primitive.name  = GlTF_Primitive.GetNameFromObject(m, i);
                    primitive.index = i;
                    GlTF_Attributes attributes = new GlTF_Attributes();
                    attributes.positionAccessor  = positionAccessor;
                    attributes.normalAccessor    = normalAccessor;
                    attributes.texCoord0Accessor = uv0Accessor;
                    attributes.texCoord1Accessor = uv1Accessor;
                    attributes.texCoord2Accessor = uv2Accessor;
                    attributes.texCoord3Accessor = uv3Accessor;
                    primitive.attributes         = attributes;
                    GlTF_Accessor indexAccessor = new GlTF_Accessor(GlTF_Accessor.GetNameFromObject(m, "indices_" + i), GlTF_Accessor.Type.SCALAR, GlTF_Accessor.ComponentType.USHORT);
                    indexAccessor.bufferView = GlTF_Writer.ushortBufferView;
                    GlTF_Writer.accessors.Add(indexAccessor);
                    primitive.indices = indexAccessor;

                    var mr = GetRenderer(tr);
                    var sm = mr.sharedMaterials;
                    if (i < sm.Length && sm[i] != null)
                    {
                        var mat     = sm[i];
                        var matName = GlTF_Material.GetNameFromObject(mat);
                        primitive.materialName = matName;
                        if (!GlTF_Writer.materials.ContainsKey(matName))
                        {
                            GlTF_Material material = new GlTF_Material();
                            material.name = matName;
                            GlTF_Writer.materials.Add(material.name, material);

                            //technique
                            var s        = mat.shader;
                            var techName = GlTF_Technique.GetNameFromObject(s);
                            material.instanceTechniqueName = techName;
                            if (!GlTF_Writer.techniques.ContainsKey(techName))
                            {
                                GlTF_Technique tech = new GlTF_Technique();
                                tech.name = techName;

                                GlTF_Technique.States ts = null;
                                if (preset.techniqueStates.ContainsKey(s.name))
                                {
                                    ts = preset.techniqueStates[s.name];
                                }
                                else if (preset.techniqueStates.ContainsKey("*"))
                                {
                                    ts = preset.techniqueStates["*"];
                                }

                                if (ts == null)
                                {
                                    // Unless otherwise specified by a preset file, enable z-buffering.
                                    ts = new GlTF_Technique.States();
                                    const int DEPTH_TEST = 2929;
                                    // int CULL_FACE = 2884;
                                    ts.enable = new int[1] {
                                        DEPTH_TEST
                                    };
                                }

                                tech.states = ts;

                                GlTF_Technique.Parameter tParam = new GlTF_Technique.Parameter();
                                tParam.name     = "position";
                                tParam.type     = GlTF_Technique.Type.FLOAT_VEC3;
                                tParam.semantic = GlTF_Technique.Semantic.POSITION;
                                tech.parameters.Add(tParam);
                                GlTF_Technique.Attribute tAttr = new GlTF_Technique.Attribute();
                                tAttr.name  = "a_position";
                                tAttr.param = tParam.name;
                                tech.attributes.Add(tAttr);

                                if (normalAccessor != null)
                                {
                                    tParam          = new GlTF_Technique.Parameter();
                                    tParam.name     = "normal";
                                    tParam.type     = GlTF_Technique.Type.FLOAT_VEC3;
                                    tParam.semantic = GlTF_Technique.Semantic.NORMAL;
                                    tech.parameters.Add(tParam);
                                    tAttr       = new GlTF_Technique.Attribute();
                                    tAttr.name  = "a_normal";
                                    tAttr.param = tParam.name;
                                    tech.attributes.Add(tAttr);
                                }

                                if (uv0Accessor != null)
                                {
                                    tParam          = new GlTF_Technique.Parameter();
                                    tParam.name     = "texcoord0";
                                    tParam.type     = GlTF_Technique.Type.FLOAT_VEC2;
                                    tParam.semantic = GlTF_Technique.Semantic.TEXCOORD_0;
                                    tech.parameters.Add(tParam);
                                    tAttr       = new GlTF_Technique.Attribute();
                                    tAttr.name  = "a_texcoord0";
                                    tAttr.param = tParam.name;
                                    tech.attributes.Add(tAttr);
                                }

                                if (uv1Accessor != null)
                                {
                                    tParam          = new GlTF_Technique.Parameter();
                                    tParam.name     = "texcoord1";
                                    tParam.type     = GlTF_Technique.Type.FLOAT_VEC2;
                                    tParam.semantic = GlTF_Technique.Semantic.TEXCOORD_1;
                                    tech.parameters.Add(tParam);
                                    tAttr       = new GlTF_Technique.Attribute();
                                    tAttr.name  = "a_texcoord1";
                                    tAttr.param = tParam.name;
                                    tech.attributes.Add(tAttr);
                                }

                                if (uv2Accessor != null)
                                {
                                    tParam          = new GlTF_Technique.Parameter();
                                    tParam.name     = "texcoord2";
                                    tParam.type     = GlTF_Technique.Type.FLOAT_VEC2;
                                    tParam.semantic = GlTF_Technique.Semantic.TEXCOORD_2;
                                    tech.parameters.Add(tParam);
                                    tAttr       = new GlTF_Technique.Attribute();
                                    tAttr.name  = "a_texcoord2";
                                    tAttr.param = tParam.name;
                                    tech.attributes.Add(tAttr);
                                }

                                if (uv3Accessor != null)
                                {
                                    tParam          = new GlTF_Technique.Parameter();
                                    tParam.name     = "texcoord3";
                                    tParam.type     = GlTF_Technique.Type.FLOAT_VEC2;
                                    tParam.semantic = GlTF_Technique.Semantic.TEXCOORD_3;
                                    tech.parameters.Add(tParam);
                                    tAttr       = new GlTF_Technique.Attribute();
                                    tAttr.name  = "a_texcoord3";
                                    tAttr.param = tParam.name;
                                    tech.attributes.Add(tAttr);
                                }

                                tech.AddDefaultUniforms(writer.RTCCenter != null);

                                GlTF_Writer.techniques.Add(techName, tech);

                                int spCount = ShaderUtil.GetPropertyCount(s);
                                for (var j = 0; j < spCount; ++j)
                                {
                                    var pName = ShaderUtil.GetPropertyName(s, j);
                                    var pType = ShaderUtil.GetPropertyType(s, j);
                                    // Debug.Log(pName + " " + pType);

                                    GlTF_Technique.Uniform tUni;
                                    if (pType == ShaderUtil.ShaderPropertyType.Color)
                                    {
                                        tParam      = new GlTF_Technique.Parameter();
                                        tParam.name = pName;
                                        tParam.type = GlTF_Technique.Type.FLOAT_VEC4;
                                        tech.parameters.Add(tParam);
                                        tUni       = new GlTF_Technique.Uniform();
                                        tUni.name  = pName;
                                        tUni.param = tParam.name;
                                        tech.uniforms.Add(tUni);
                                    }
                                    else if (pType == ShaderUtil.ShaderPropertyType.Vector)
                                    {
                                        tParam      = new GlTF_Technique.Parameter();
                                        tParam.name = pName;
                                        tParam.type = GlTF_Technique.Type.FLOAT_VEC4;
                                        tech.parameters.Add(tParam);
                                        tUni       = new GlTF_Technique.Uniform();
                                        tUni.name  = pName;
                                        tUni.param = tParam.name;
                                        tech.uniforms.Add(tUni);
                                    }
                                    else if (pType == ShaderUtil.ShaderPropertyType.Float ||
                                             pType == ShaderUtil.ShaderPropertyType.Range)
                                    {
                                        tParam      = new GlTF_Technique.Parameter();
                                        tParam.name = pName;
                                        tParam.type = GlTF_Technique.Type.FLOAT;
                                        tech.parameters.Add(tParam);
                                        tUni       = new GlTF_Technique.Uniform();
                                        tUni.name  = pName;
                                        tUni.param = tParam.name;
                                        tech.uniforms.Add(tUni);
                                    }
                                    else if (pType == ShaderUtil.ShaderPropertyType.TexEnv)
                                    {
                                        var td = ShaderUtil.GetTexDim(s, j);
                                        if (td == UnityEngine.Rendering.TextureDimension.Tex2D)
                                        {
                                            tParam      = new GlTF_Technique.Parameter();
                                            tParam.name = pName;
                                            tParam.type = GlTF_Technique.Type.SAMPLER_2D;
                                            tech.parameters.Add(tParam);
                                            tUni       = new GlTF_Technique.Uniform();
                                            tUni.name  = pName;
                                            tUni.param = tParam.name;
                                            tech.uniforms.Add(tUni);
                                        }
                                    }
                                }

                                // create program
                                GlTF_Program program = new GlTF_Program();
                                program.name = GlTF_Program.GetNameFromObject(s);
                                tech.program = program.name;
                                foreach (var attr in tech.attributes)
                                {
                                    program.attributes.Add(attr.name);
                                }
                                GlTF_Writer.programs.Add(program);

                                // shader
                                GlTF_Shader vs = new GlTF_Shader();
                                vs.name = GlTF_Shader.GetNameFromObject(s, GlTF_Shader.Type.Vertex);
                                program.vertexShader = vs.name;
                                vs.type = GlTF_Shader.Type.Vertex;
                                vs.uri  = preset.GetVertexShader(s.name);
                                GlTF_Writer.shaders.Add(vs);

                                GlTF_Shader fs = new GlTF_Shader();
                                fs.name = GlTF_Shader.GetNameFromObject(s, GlTF_Shader.Type.Fragment);
                                program.fragmentShader = fs.name;
                                fs.type = GlTF_Shader.Type.Fragment;
                                fs.uri  = preset.GetFragmentShader(s.name);
                                GlTF_Writer.shaders.Add(fs);
                            }

                            int spCount2 = ShaderUtil.GetPropertyCount(s);
                            for (var j = 0; j < spCount2; ++j)
                            {
                                var pName = ShaderUtil.GetPropertyName(s, j);
                                var pType = ShaderUtil.GetPropertyType(s, j);

                                if (pType == ShaderUtil.ShaderPropertyType.Color)
                                {
                                    var matCol = new GlTF_Material.ColorValue();
                                    matCol.name  = pName;
                                    matCol.color = mat.GetColor(pName);
                                    material.values.Add(matCol);
                                }
                                else if (pType == ShaderUtil.ShaderPropertyType.Vector)
                                {
                                    var matVec = new GlTF_Material.VectorValue();
                                    matVec.name   = pName;
                                    matVec.vector = mat.GetVector(pName);
                                    material.values.Add(matVec);
                                }
                                else if (pType == ShaderUtil.ShaderPropertyType.Float ||
                                         pType == ShaderUtil.ShaderPropertyType.Range)
                                {
                                    var matFloat = new GlTF_Material.FloatValue();
                                    matFloat.name  = pName;
                                    matFloat.value = mat.GetFloat(pName);
                                    material.values.Add(matFloat);
                                }
                                else if (pType == ShaderUtil.ShaderPropertyType.TexEnv)
                                {
                                    var td = ShaderUtil.GetTexDim(s, j);
                                    if (td == UnityEngine.Rendering.TextureDimension.Tex2D)
                                    {
                                        var t = mat.GetTexture(pName);
                                        if (t == null)
                                        {
                                            continue;
                                        }
                                        var val = new GlTF_Material.StringValue();
                                        val.name = pName;
                                        string texName = null;
                                        texName   = GlTF_Texture.GetNameFromObject(t);
                                        val.value = texName;
                                        material.values.Add(val);
                                        if (!GlTF_Writer.textures.ContainsKey(texName))
                                        {
                                            var        texPath = ExportTexture(t, savedPath);
                                            GlTF_Image img     = new GlTF_Image();
                                            img.name = GlTF_Image.GetNameFromObject(t);
                                            img.uri  = texPath;
                                            GlTF_Writer.images.Add(img);

                                            GlTF_Sampler sampler;
                                            var          samplerName = GlTF_Sampler.GetNameFromObject(t);
                                            if (GlTF_Writer.samplers.ContainsKey(samplerName))
                                            {
                                                sampler = GlTF_Writer.samplers[samplerName];
                                            }
                                            else
                                            {
                                                sampler      = new GlTF_Sampler(t);
                                                sampler.name = samplerName;
                                                GlTF_Writer.samplers[samplerName] = sampler;
                                            }

                                            GlTF_Texture texture = new GlTF_Texture();
                                            texture.name        = texName;
                                            texture.source      = img.name;
                                            texture.samplerName = samplerName;

                                            GlTF_Writer.textures.Add(texName, texture);
                                        }
                                    }
                                }
                            }
                        }
                    }

                    mesh.primitives.Add(primitive);
                }

                mesh.Populate(m);
                GlTF_Writer.meshes.Add(mesh);
                if (unpackTexture)
                {
                    TextureUnpacker.ProcessMesh(mesh);
                }

                // calculate bounding box transform
                if (root != null)
                {
                    Matrix4x4 brot = Matrix4x4.identity;
                    if (rotCallback != null)
                    {
                        brot = rotCallback.GetBoundsRotationMatrix(root);
                    }

                    var pos    = tr.position - root.position; // relative to parent
                    var objMat = Matrix4x4.TRS(pos, tr.rotation, tr.lossyScale);

                    //read vertices
                    var ms     = positionAccessor.bufferView.memoryStream;
                    var offset = (int)positionAccessor.byteOffset;
                    var len    = positionAccessor.count;
                    var buffer = new byte[len * 12];
                    var mspos  = ms.Position;
                    ms.Position = offset;
                    ms.Read(buffer, 0, buffer.Length);

                    minHeight = double.MaxValue;
                    maxHeight = double.MinValue;

                    double[] c = writer.RTCCenter;

                    double[] minPos = new double[3];
                    minPos[0] = double.MaxValue;
                    minPos[1] = double.MaxValue;
                    minPos[2] = double.MaxValue;

                    double[] maxPos = new double[3];
                    maxPos[0] = double.MinValue;
                    maxPos[1] = double.MinValue;
                    maxPos[2] = double.MinValue;

                    for (int j = 0; j < len; ++j)
                    {
                        var x = System.BitConverter.ToSingle(buffer, j * 12);
                        var y = System.BitConverter.ToSingle(buffer, j * 12 + 4);
                        var z = System.BitConverter.ToSingle(buffer, j * 12 + 8);

                        // local rotation
                        var lx = objMat.m00 * x + objMat.m01 * y + objMat.m02 * z;
                        var ly = objMat.m10 * x + objMat.m11 * y + objMat.m12 * z;
                        var lz = objMat.m20 * x + objMat.m21 * y + objMat.m22 * z;

                        minHeight = Math.Min(minHeight, ly);
                        maxHeight = Math.Max(maxHeight, ly);

                        // to world
                        double wx = brot.m00 * lx + brot.m01 * ly + brot.m02 * lz;
                        double wy = brot.m10 * lx + brot.m11 * ly + brot.m12 * lz;
                        double wz = brot.m20 * lx + brot.m21 * ly + brot.m22 * lz;

                        // local translation to world
                        double tx = brot.m00 * pos.x + brot.m01 * pos.y + brot.m02 * pos.z;
                        double ty = brot.m10 * pos.x + brot.m11 * pos.y + brot.m12 * pos.z;
                        double tz = brot.m20 * pos.x + brot.m21 * pos.y + brot.m22 * pos.z;

                        wx += tx;
                        wy += ty;
                        wz += tz;

                        if (c != null)
                        {
                            wx += c[0];
                            wy += c[1];
                            wz += c[2];
                        }

                        minPos[0] = Math.Min(minPos[0], wx);
                        minPos[1] = Math.Min(minPos[1], wy);
                        minPos[2] = Math.Min(minPos[2], wz);

                        maxPos[0] = Math.Max(maxPos[0], wx);
                        maxPos[1] = Math.Max(maxPos[1], wy);
                        maxPos[2] = Math.Max(maxPos[2], wz);
                    }

                    ms.Position = mspos;

                    BoundsDouble tbb = new BoundsDouble();
                    tbb.Encapsulate(new BoundsDouble(minPos, maxPos));
                    bb.Encapsulate(tbb);
                }
            }

            Animation a = tr.GetComponent <Animation>();

            //				Animator a = tr.GetComponent<Animator>();
            if (a != null)
            {
                AnimationClip[] clips  = AnimationUtility.GetAnimationClips(tr.gameObject);
                int             nClips = clips.Length;
                //					int nClips = a.GetClipCount();
                for (int i = 0; i < nClips; i++)
                {
                    GlTF_Animation anim = new GlTF_Animation(a.name);
                    anim.Populate(clips[i]);
                    GlTF_Writer.animations.Add(anim);
                }
            }


            // next, build hierarchy of nodes
            GlTF_Node node = new GlTF_Node();

            Matrix4x4 rotMat = Matrix4x4.identity;
            if (root != null && rotCallback != null)
            {
                rotMat = rotCallback.GetNodeRotationMatrix(root);
            }

            if (tr == root)
            {
                Matrix4x4 mat = Matrix4x4.identity;
                mat.m22 = -1; // flip z axis

                if (rotMat != Matrix4x4.identity)
                {
                    mat = rotMat;
                }

                // do not use global position if rtc is defined
                Vector3 pos = Vector3.zero;
                if (writer.RTCCenter == null)
                {
                    pos = tr.localPosition;
                }

                mat         = mat * Matrix4x4.TRS(pos, tr.localRotation, tr.localScale);
                node.matrix = new GlTF_Matrix(mat);
            }
            else
            {
                node.hasParent = true;
                if (tr.localPosition != Vector3.zero)
                {
                    node.translation = new GlTF_Translation(tr.localPosition);
                }
                if (tr.localScale != Vector3.one)
                {
                    node.scale = new GlTF_Scale(tr.localScale);
                }
                if (tr.localRotation != Quaternion.identity)
                {
                    node.rotation = new GlTF_Rotation(tr.localRotation);
                }
            }

            node.name = GlTF_Node.GetNameFromObject(tr);
            if (tr.GetComponent <Camera>() != null)
            {
                node.cameraName = tr.name;
            }
            else if (tr.GetComponent <Light>() != null)
            {
                node.lightName = tr.name;
            }
            else if (m != null)
            {
                node.meshNames.Add(GlTF_Mesh.GetNameFromObject(m));
            }

            foreach (Transform t in tr.transform)
            {
                var found = false;
                foreach (var check in trs)
                {
                    if (t == check)
                    {
                        found = true;
                        break;
                    }
                }
                if (found)
                {
                    node.childrenNames.Add(GlTF_Node.GetNameFromObject(t));
                }
            }

            GlTF_Writer.nodes.Add(node);
        }

        if (copyShaders && preset.shaderDir != null)
        {
            var sd = Path.Combine(Application.dataPath, preset.shaderDir);
            foreach (var shader in GlTF_Writer.shaders)
            {
                var srcPath = Path.Combine(sd, shader.uri);
                if (File.Exists(srcPath))
                {
                    var dstPath = Path.Combine(savedPath, shader.uri);
                    File.Copy(srcPath, dstPath, true);
                }
            }
        }

        // third, add meshes etc to byte stream, keeping track of buffer offsets
        writer.Write();
        writer.CloseFiles();
        return(bb);
    }