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我成功地将新墙 (IfcWallStandardCase) 添加到现有 IFC 模型并在 DrawingControl3D 中显示 - 在XBim Toolkit 的Proper Wall 3D示例的帮助下，这是我为墙添加颜色的代码：

//add color to the proper wall
var orange = model.Instances.New<IfcColourRgb>();
orange.Red = (255.0 / 255.0);                   
orange.Green = (69.0 / 255.0);                  
orange.Blue = (0.0 / 255.0);                     

var newStyleRendering = model.Instances.New<IfcSurfaceStyleRendering>();
newStyleRendering.SurfaceColour = orange;

var newSurfaceStyle = model.Instances.New<IfcSurfaceStyle>();
newSurfaceStyle.Styles.Add(newStyleRendering);

var newStyleAssignment = model.Instances.New<IfcPresentationStyleAssignment>();
newStyleAssignment.Styles.Add(newSurfaceStyle);

var newStyledItem = model.Instances.New<IfcStyledItem>();
newStyledItem.Name = "Standard Wall Styling";
newStyledItem.Item = body;
newStyledItem.Styles.Add(newStyleAssignment);

现在，我尝试使用最初添加样式（颜色）的方式在单击按钮时更改那面墙的颜色，这是我的尝试：

var walls = model.Instances.OfType<IfcStyledItem>();
var _newWall = walls.Where(w => w.Name == "Standard Wall Styling").FirstOrDefault();

if (_newWall != null)
{

    var newColour = model.Instances.New<IfcColourRgb>();
    newColour.Red = (24 / 255.0);
    newColour.Green = (24 / 255.0);
    newColour.Blue = (24 / 255.0);

    var newStyleRendering = model.Instances.New<IfcSurfaceStyleRendering>();
    newStyleRendering.SurfaceColour = newColour;

    _newWall.Styles[0].SurfaceStyles.FirstOrDefault().Styles.Clear();
    _newWall.Styles[0].SurfaceStyles.FirstOrDefault().Styles.Add(newStyleRendering);

    txn.Commit();
    DrawingControl.ReloadModel();
}

我通过名称查询得到名为“IfcStyledItem”，并遍历它的“SurfaceStyle”来替换之前设置的“ColourRGB”，然后重新加载DrawingControl3D模型。但并不成功。

我一直在网上寻找如何正确执行此操作，但找不到任何内容。非常感谢任何有关如何实现这一目标的线索。

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1 回答 1

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好的，为了这样做，您需要IfcSurfaceStyle为您IfcExtrudedAreaSolid的墙分配一个新的。下面的代码适用于Proper Wall 3D示例和从 revit 2018 导出的 ifc。

private bool AddNewSurfaceStyle(IfcBuildingElement element)
        {
            var representations = element.Representation.Representations;
            if (representations.Count == 0) return false;
            var body = representations.FirstOrDefault(a => a.RepresentationType == "SweptSolid");
            if (body == null) return false;
            var extrudedAreaSolid = body.Items.FirstOrDefault(a => a is IIfcExtrudedAreaSolid);
            if (extrudedAreaSolid == null) return false;
            var elementStyle = extrudedAreaSolid.StyledByItem.FirstOrDefault();
            using (var txn = element.Model.BeginTransaction("Create Style"))
            {
                var styleAssignment = element.Model.Instances.New<IfcPresentationStyleAssignment>();
                var surfaceStyle = element.Model.Instances.New<IfcSurfaceStyle>();
                var surfaceStyleRedering = element.Model.Instances.New<IfcSurfaceStyleRendering>();
                var colourRGB = element.Model.Instances.New<IfcColourRgb>();
                colourRGB.Blue = 1;
                colourRGB.Red = 1;
                colourRGB.Green = 0;
                surfaceStyleRedering.Transparency = 0;
                surfaceStyleRedering.SurfaceColour = colourRGB;
                surfaceStyle.Styles.Add(surfaceStyleRedering);
                styleAssignment.Styles.Add(surfaceStyle);
                elementStyle.Styles.Clear();
                elementStyle.Styles.Add(styleAssignment);
                txn.Commit();
            }
            return true;
        }
于 2019-07-17T06:43:33.857 回答