Autodesk Forge：模型比较（BIM 360 功能）

Question

Bim 360 有一个很棒的工具，称为“比较版本”，它允许查看两个 Revit 模型之间的更改。可以在此处找到有关该功能的更多信息：

Compare versions info

Autodesk Forge 中是否有此功能？我找不到它，我确实看到 forge 有一个 BIM 360 API，但我没有看到这个功能可用。

Answer 1

不，至少现在是这样。会很好，不是吗？也许在未来......

Answer 2

您可以使用ForgeAuthor sdk 执行此操作。

ForgeAuthor 是一个基于 .net 框架 4.5 的 .net 库，它提供了一种很好的面向对象的方式来操作 Audesk Forge Svf 模型，就像操作 XML 或 JSON 一样简单。

ForgeAuthor 可以读取 Autodesk Forge SVF 模型，比较差异，并生成差异模型。

#region setup materials

                var matUnmodified = new Material
                {
                    Color = Vector3D.FromColor(0xffffff), //Darker: Vector3D.FromColor(0x101010)
                    Transparent = 0.95,
                    Reflectivity = 0
                };

                var matAdd = new Material
                {
                    Color = Vector3D.FromColor(Color.GreenYellow)
                };

                var matDelete = new Material
                {
                    Color = Vector3D.FromColor(Color.Red)
                };

                var matModifiedBefore = new Material
                {
                    Color = Vector3D.FromColor(Color.Orange),
                    Transparent = 0.5
                };

                var matModifiedAfter = new Material
                {
                    Color = Vector3D.FromColor(Color.Aqua),
                };

                #endregion

                var baseModelPath = txtBaseModel.Text;
                var incrModelPath = txtIncrementModel.Text;
                var diffModelPath = txtDiffModel.Text;

                var svfbase = baseModelPath.EndsWith(@"zip")
                    ? SvfDocument.LoadFromZipFile(baseModelPath)
                    : SvfDocument.LoadFromSvfFile(baseModelPath);

                var svfincr = incrModelPath.EndsWith(@"zip")
                    ? SvfDocument.LoadFromZipFile(incrModelPath)
                    : SvfDocument.LoadFromSvfFile(incrModelPath);

                var compareResult = CompareModel(svfbase, svfincr);

                var svfdiff = new SvfDocument();
                svfdiff.Model.Name = @"Diff Model";
                svfdiff.Metadata = svfbase.Metadata;

                var nodeUnmodified = svfdiff.Model.Children.CreateNode();
                nodeUnmodified.Name = @"Unmodified";

                var nodeAdded = svfdiff.Model.Children.CreateNode();
                nodeAdded.Name = @"Added";

                var nodeDeleted = svfdiff.Model.Children.CreateNode();
                nodeDeleted.Name = @"Deleted";

                var nodeModifiedBefore = svfdiff.Model.Children.CreateNode();
                nodeModifiedBefore.Name = @"Modified Before";

                var nodeModifiedAfter = svfdiff.Model.Children.CreateNode();
                nodeModifiedAfter.Name = @"Modified After";

                svfbase.EnumerateNodes(node =>
                {
                    if (node.Children?.Count == 0 &&
                        node.Fragments?.Count > 0 &&
                        string.IsNullOrEmpty(node.ExternalId) == false)
                    {
                        if (compareResult.Unmodified.Remove(node.ExternalId))
                        {
                            ImportNodeWithPath(nodeUnmodified, node, svfbase.Model, matUnmodified);
                        }
                        else if (compareResult.Deleted.Remove(node.ExternalId))
                        {
                            ImportNodeWithPath(nodeDeleted, node, svfbase.Model, matDelete);
                        }
                        else if (compareResult.Modified.Contains(node.ExternalId))
                        {
                            var targetNode =
                                ImportNodeWithPath(nodeModifiedBefore, node, svfbase.Model, matModifiedBefore);
                            targetNode.ExternalId += @"_Before";
                        }
                    }
                }, svfbase.Model);

                svfincr.EnumerateNodes(node =>
                {
                    if (node.Children?.Count == 0 &&
                        node.Fragments?.Count > 0 &&
                        string.IsNullOrEmpty(node.ExternalId) == false)
                    {
                        if (compareResult.Added.Remove(node.ExternalId))
                        {
                            ImportNodeWithPath(nodeAdded, node, svfincr.Model, matAdd);
                        }
                        else if (compareResult.Modified.Remove(node.ExternalId))
                        {
                            ImportNodeWithPath(nodeModifiedAfter, node, svfincr.Model, matModifiedAfter);
                        }
                    }
                }, svfincr.Model);

                svfdiff.SaveToFolder(diffModelPath, true);
                svfdiff.Dispose();

                svfbase.Dispose();
                svfincr.Dispose();



private (HashSet<string> Unmodified, HashSet<string> Added, HashSet<string> Deleted, HashSet<string> Modified)
        CompareModel(SvfDocument svfbase, SvfDocument svfincr)
    {
        var baseNodes = new Dictionary<string, SvfNode>();
        svfbase.EnumerateNodes(node =>
        {
            if (node.Children?.Count == 0
                && node.Fragments?.Count > 0
                && string.IsNullOrEmpty(node.ExternalId) == false)
            {
                baseNodes[node.ExternalId] = node;
            }
        }, svfbase.Model);

        var elementsAdded = new HashSet<string>();
        var elementsUnmodified = new HashSet<string>();
        var elementsModified = new HashSet<string>();
        var elementsDeleted = new HashSet<string>();

        svfincr.EnumerateNodes(node =>
        {
            if (node.Children?.Count == 0
                && node.Fragments?.Count > 0
                && string.IsNullOrEmpty(node.ExternalId) == false)
            {
                if (baseNodes.TryGetValue(node.ExternalId, out SvfNode baseNode))
                {
                    if (baseNode.Fragments.Equals(node.Fragments))
                    {
                        elementsUnmodified.Add(node.ExternalId); //unmdified
                    }
                    else
                    {
                        elementsModified.Add(node.ExternalId); //modified
                    }

                    baseNodes.Remove(node.ExternalId);
                }
                else
                {
                    elementsAdded.Add(node.ExternalId); //added
                }
            }
        }, svfincr.Model);

        foreach (var p in baseNodes.Keys)
        {
            elementsDeleted.Add(p); //deleted
        }
        baseNodes.Clear();

        return (elementsUnmodified, elementsAdded, elementsDeleted, elementsModified);
    }

    private SvfNode ImportNodeWithPath(SvfNode targetNodeRoot, SvfNode sourceNode, SvfNode sourceNodeRoot, Material material)
    {
        var targetNode = sourceNode.Parent == sourceNodeRoot
            ? targetNodeRoot
            : ImportNodeWithPath(targetNodeRoot, sourceNode.Parent, sourceNodeRoot, material);
        var resultNode = targetNode.Children.FirstOrDefault(x => x.Name == sourceNode.Name);
        if (resultNode == null)
        {
            resultNode = targetNode.Children.ImportNode(sourceNode, null, false);
            foreach (var fragment in resultNode.Fragments)
            {
                fragment.Material = material;
            }
        }
        return resultNode;
    }

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