如何在WPF中正确更改XBim标准墙体颜色

Question

我成功地将新墙(IfcWallStandardCase)添加到现有的国际金融公司模型中，并将其显示在DrawingControl3D中-在XBim工具包的Proper Wall 3D示例的帮助下，以下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，我正尝试在点击按钮时更改墙的颜色，首先使用样式(颜色)是如何添加的，以下是我的尝试：

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();
}

我通过名称查询获得了命名的"IfcStyledItem“，并遍历到它的"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地做到这一点，但没有找到任何东西。任何关于如何实现这一点的线索都是非常感谢的。

Answer 1

好的，为了做到这一点，你需要分配一个新的IfcSurfaceStyle到你的IfcExtrudedAreaSolid的wall.the代码下面工作很好的Proper Wall 3D示例和ifc从revit 2018导出。

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;
        }