如何创建给定梁的端点和横截面的简单IFC文件

Question

我想创建一个表示梁的IFC文件。我得到的输入是两个点和一个横截面定义。其目的是查看梁的形状。谁能给我指个正确的方向。XBim有没有什么东西可以让人做到这一点？

我尝试读取从Tekla导出的IFC文件，该文件只有一个光束。我试着通读IFC模式定义规范。(不是很成功地找到了一个)

未编写任何代码

我期望的是输入一个配置文件。(我不知道如何输入截面轮廓)，输入起点和终点以创建表示梁的IFC文件。然后，我应该能够在IFC查看器中打开文件并查看梁

Answer 1

XBim将所有IFC实体作为C#类提供(早期绑定)。

您可以通过以下方式为实例创建跨配置文件：

public IfcProfileDef getBasicProfileDescirption() {
    IfcPolyline polyline = new IfcPolyline(id++);
    model_.insertEntity(polyline);

    double Left = -OverallWidth_ / 2.0;
    double Right = OverallWidth_ / 2.0;
    double Top = OverallDepth_ / 2.0;
    double Bottom = -OverallDepth_ / 2.0;

    polyline.Points.add(createPoint(Left,Top) ); // coordinate (A)
    polyline.Points.add(createPoint(Right,Top) ); // coordinate (B)
    polyline.Points.add(createPoint(Right,Top-FlangeThickness_)); // coordinate (C)
    polyline.Points.add(createPoint(WebThickness_*0.5,Top-FlangeThickness_) ); // coordinate (D)
    polyline.Points.add(createPoint(WebThickness_*0.5,Bottom+FlangeThickness_) ); // coordinate (E)
    polyline.Points.add(createPoint(Right,Bottom+FlangeThickness_) ); // coordinate (F)
    polyline.Points.add(createPoint(Right,Bottom) ); // coordinate (G)
    polyline.Points.add(createPoint(Left,Bottom) ); // coordinate (H)
    polyline.Points.add(createPoint(Left,Bottom+FlangeThickness_) ); // coordinate (I)
    polyline.Points.add(createPoint(-WebThickness_*0.5,Bottom+FlangeThickness_) ); // coordinate (J)
    polyline.Points.add(createPoint(-WebThickness_*0.5,Top-FlangeThickness_) ); // coordinate (K)
    polyline.Points.add(createPoint(Left,Top-FlangeThickness_) ); // coordinate (L)
    // close profile
    polyline.Points.add(createPoint(Left,Top)); // coordinate (A)

    IfcArbitraryClosedProfileDef profile = new IfcArbitraryClosedProfileDef(id++);
    model_.insertEntity(profile);

    //profile.ProfileType = new IfcProfileTypeEnum(IfcProfileTypeEnum.AREA);
    profile.OuterCurve = polyline;

    return profile;
} 

为了创建一个笛卡尔二维点，我使用这个方法：

private IfcCartesianPoint createPoint(double x, double y) {
    IfcCartesianPoint point = new IfcCartesianPoint(id++);

    point.Coordinates.add(new IfcLengthMeasure(x));
    point.Coordinates.add(new IfcLengthMeasure(y));

    model_.insertEntity(point);

    return point;
}

可以通过以下方式创建proifle的拉伸实体形式：

private IfcExtrudedAreaSolid getBasicProfileDescirption() {
    IfcExtrudedAreaSolid baseMesh = new IfcExtrudedAreaSolid();
    baseMesh.SweptArea = getBasicProfileDescirption();
    baseMesh.ExtrudedDirection = createDirecton(0, 0, 1);
    baseMesh.Depth = new IfcPositiveLengthMeasure(scale_ * height_);
    return baseMesh;
}

IFC定义了许多可以使用的横截面(轮廓)：

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顺便说一句，getDirection方法看起来像这样：

private IfcDirection createDirecton(double x, double y, double z) {
    IfcDirection dir = new IfcDirection();
    dir.DirectionRatios.add(new IfcReal(x));
    dir.DirectionRatios.add(new IfcReal(y));
    dir.DirectionRatios.add(new IfcReal(z));
    return dir;
}

Answer 2

谢谢。我就试试这个吧。