如何在给定梁的端点和横截面的情况下创建简单的IFC文件

Question

我想创建一个代表光束的IFC文件。我输入的内容是2点和一个横截面定义。目的是查看光束的形状。有人可以指出我正确的方向。 XBim是否有可以使之做到这一点的东西？

我尝试通读从Tekla导出的IFC文件，该文件只有一个光束。我尝试通读IFC Schema定义规范。（找到一个不是很成功）

未编写任何代码

我期望输入一个配置文件。 （我不知道如何输入轮廓），输入起点和终点以创建代表光束的IFC文件。然后，我应该能够在IFC查看器中打开文件并查看光束

Answer 1

XBim将所有IFC实体作为C＃类（早期绑定）提供。

您可以通过以下方式创建交叉配置文件：

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;
} 

要创建笛卡尔二维点，请使用以下方法：

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轮廓的挤压实体：

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corss部分（配置文件）：

顺便说一句，getDirection方法如下：

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;
}