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Fix values of IfcAlignmentVerticalSegmentTypeEnum #1003

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Fix values of IfcAlignmentVerticalSegmentTypeEnum #1003

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7ce4f64
Fix values of IfcAlignmentVerticalSegmentTypeEnum
civilx64 Oct 22, 2025
d6e13a1
catch a few other locations
civilx64 Oct 22, 2025
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10 changes: 5 additions & 5 deletions ...resource/IfcGeometricConstraintResource/Entities/IfcAlignmentVerticalSegment.md
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Expand Up @@ -7,9 +7,9 @@ The vertical alignment is defined by segments that connects end-to-start. The ve

The following vertical segment types are defined:

* line segment - _IfcAlignmentVerticalSegmentTypeEnum_ .LINE.
* circular arc segment - _IfcAlignmentVerticalSegmentTypeEnum_ .ARC.
* parabolic arc segment - _IfcAlignmentVerticalSegmentTypeEnum_ .PARABOLICARC. which can describe symmetric parabolas, unsymmetric parabolas can be created by defining two symmetric parabolas segments
* line segment - _IfcAlignmentVerticalSegmentTypeEnum_ .CONSTANTGRADIENT.
* circular arc segment - _IfcAlignmentVerticalSegmentTypeEnum_ .CIRCULARARC.
* parabolic arc segment - _IfcAlignmentVerticalSegmentTypeEnum_ .PARABOLICARC. which can describe symmetric parabolas. Unsymmetric parabolas can be created by defining two symmetric parabolas segments
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@aothms aothms Oct 22, 2025

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Asymmetric? Or is this specific idiom?

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@SergejMuhic SergejMuhic Oct 22, 2025

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To my knowledge the terms are interchangeable.

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@civilx64 civilx64 Oct 22, 2025

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Asymmetric is more common in my experience but unsymmetric is ok to leave as-is. I have only encountered them in preparation for the PE exam - never in actual practice.

* transition segment with linear curvature variation - _IfcAlignmentVerticalSegmentTypeEnum_ .CLOTHOID.

For each vertical segment, the following non-redundant information is provided:
Expand Down Expand Up @@ -57,9 +57,9 @@ End gradient of the segment. In the case of a PredefinedType='.CONSTANTGRADIENT.

### RadiusOfCurvature
Radius of parabola or arc. Positive values imply a CCW direction whereas negative CW.
> NOTE1 For _PredefinedType_ is ARC. The radius of the basis circle for the arc.
> NOTE1 For _PredefinedType_ is CIRCULARARC. The radius of the basis circle for the arc.
> NOTE2 For _PredefinedType_ is PARABOLICARC. Parabola constant (determining the “steepness” of the parabola). The parabola constant is provided by the “minimum parabola radius”, the true radius of a parabola at its vertical axis (the zero-gradient point of the parabola). The minimum radius is twice the focal length of the parabola (the distance between the focal point and the vertex).
> NOTE3 For _PredefinedType_ that is not either ARC or PARABOLICARC the value should be empty.
> NOTE3 For _PredefinedType_ that is not either CIRCULARARC or PARABOLICARC the value should be empty.

### PredefinedType
Predefined type of the vertical alignmnent segment.