# \#4x3alpha
**URL:** https://forums.buildingsmart.org/tag/4x3alpha/77.md
[Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md)
---
## [IFC File Analyzer now supports IFC4.3\_RC4](https://forums.buildingsmart.org/t/ifc-file-analyzer-now-supports-ifc4-3-rc4/3875)
**Author:** [@robertlipman](https://forums.buildingsmart.org/u/robertlipman)\
**Replies:** 3\
**Last updated:** [March 28, 2023, 7:51pm UTC](https://forums.buildingsmart.org/t/ifc-file-analyzer-now-supports-ifc4-3-rc4/3875 "2023-03-28T19:51:07Z")
The NIST IFC File Analyzer now supports IFC4.3\_RC4 in addition to IFC2X3, IFC4, and IFC4.2. Support for other versions of IFC can be added. Google “IFC File Analyzer” to find the website.
---
## [IFC 2D geometry - Floorplan](https://forums.buildingsmart.org/t/ifc-2d-geometry-floorplan/4649)
**Author:** [@dalvarez](https://forums.buildingsmart.org/u/dalvarez)\
**Replies:** 5\
**Last updated:** [March 17, 2023, 3:41pm UTC](https://forums.buildingsmart.org/t/ifc-2d-geometry-floorplan/4649 "2023-03-17T15:41:42Z")
Hello, Does anyone is aware of a way or a tool that a 2D floorplan can be created from an IFC file (2x3 or 4x3) ? Thank you, David
---
## [How can I represent "Survey Points" in a BIM viewer?](https://forums.buildingsmart.org/t/how-can-i-represent-survey-points-in-a-bim-viewer/4431)
**Author:** [@Giacomo](https://forums.buildingsmart.org/u/Giacomo)\
**Replies:** 7\
**Last updated:** [October 28, 2022, 8:11pm UTC](https://forums.buildingsmart.org/t/how-can-i-represent-survey-points-in-a-bim-viewer/4431 "2022-10-28T20:11:55Z")
Hello, I’ve just started working on ifc files, the first thing I need to do is represent points in 3D space, I’m using GeometryGym. What I would like to achieve is to display the points as shown in the documentation: …
---
## [How to model drainage data for Road/Rail projects?](https://forums.buildingsmart.org/t/how-to-model-drainage-data-for-road-rail-projects/3884)
**Author:** [@igor.sokolov](https://forums.buildingsmart.org/u/igor.sokolov)\
**Replies:** 2\
**Last updated:** [September 10, 2021, 7:03am UTC](https://forums.buildingsmart.org/t/how-to-model-drainage-data-for-road-rail-projects/3884 "2021-09-10T07:03:28Z")
Has anybody expierence or ideas how to model drainage data for Road/Rail projects? Drainage involves “storm water” management (e.g. pipes, culverts, gutters, ditches, inlets, manholes, etc). Specifically: How should …
---
## [What is the placement of curve IfcLinearPlacement.PlacementMeasuredAlong](https://forums.buildingsmart.org/t/what-is-the-placement-of-curve-ifclinearplacement-placementmeasuredalong/2822)
**Author:** [@igor.sokolov](https://forums.buildingsmart.org/u/igor.sokolov)\
**Replies:** 1\
**Last updated:** [June 8, 2021, 4:01am UTC](https://forums.buildingsmart.org/t/what-is-the-placement-of-curve-ifclinearplacement-placementmeasuredalong/2822 "2021-06-08T04:01:38Z")
IfcLinearPlacement.PlacementMeasuredAlong references to curve, but what coordinate system is used for the curve? I have to search IfcProduct that has the curve in Representations and use ObjectPlacement to have answer. …
---
## [Construction resource documentation needs updating](https://forums.buildingsmart.org/t/construction-resource-documentation-needs-updating/3644)
**Author:** [@Moult](https://forums.buildingsmart.org/u/Moult)\
**Replies:** 5\
**Last updated:** [May 27, 2021, 2:25am UTC](https://forums.buildingsmart.org/t/construction-resource-documentation-needs-updating/3644 "2021-05-27T02:25:22Z")
The following documentation is oudated. CostRatesConsumed is now Usage. For time series properties as shown in Figure 180, each IfcTimeSeriesValue indicates a LIST of values, where the sequence of the value corresponds…
---
## [ifcrail - Assigning classification](https://forums.buildingsmart.org/t/ifcrail-assigning-classification/3128)
**Author:** [@89Jaka](https://forums.buildingsmart.org/u/89Jaka)\
**Replies:** 1\
**Last updated:** [November 25, 2020, 5:27pm UTC](https://forums.buildingsmart.org/t/ifcrail-assigning-classification/3128 "2020-11-25T17:27:25Z")
Hy, I wonder if somebody has already assigned ifc 4.3 classification to IFC Rail Project WP2 – Data Requirements Report Element list? For example: IFC Rail Element IFC\_Klass\_4.3 Enum Bird protection …
---
## [IfcOrientationExpression](https://forums.buildingsmart.org/t/ifcorientationexpression/2879)
**Author:** [@igor.sokolov](https://forums.buildingsmart.org/u/igor.sokolov)\
**Replies:** 0\
**Last updated:** [July 30, 2020, 4:09pm UTC](https://forums.buildingsmart.org/t/ifcorientationexpression/2879 "2020-07-30T16:09:14Z")
What is coordinate system of the Lateral- and VerticalAxisDirection ? Why do not use IfcAxis2Placement3D? Also our experts say this way to specify orientation is not compatible with ISO 19148 on LinearReferencing
---
## [IfcLinearPlacement example](https://forums.buildingsmart.org/t/ifclinearplacement-example/2819)
**Author:** [@igor.sokolov](https://forums.buildingsmart.org/u/igor.sokolov)\
**Replies:** 3\
**Last updated:** [July 6, 2020, 12:07pm UTC](https://forums.buildingsmart.org/t/ifclinearplacement-example/2819 "2020-07-06T12:07:34Z")
Has anybody an example of IfcLinearPlacement? Note, the example in IFC documentation is invalid, required attributes are $ example #42= IfcLinearPlacement ($,$,$,$,$);
---
## [Why we need both IfcAlignment.Axis and IfcAlignment.Representation?](https://forums.buildingsmart.org/t/why-we-need-both-ifcalignment-axis-and-ifcalignment-representation/2818)
**Author:** [@igor.sokolov](https://forums.buildingsmart.org/u/igor.sokolov)\
**Replies:** 0\
**Last updated:** [July 1, 2020, 12:19pm UTC](https://forums.buildingsmart.org/t/why-we-need-both-ifcalignment-axis-and-ifcalignment-representation/2818 "2020-07-01T12:19:12Z")
Why IfcLinearPositioningElement adds nee attribute Axis, instead adding requirement to existing Representation attribute? How to treat if geometry Axis and Representation mismatch?
---
## [FILE\_SCHEMA vs. Schema Version](https://forums.buildingsmart.org/t/file-schema-vs-schema-version/2750)
**Author:** [@Steffen.Rabe](https://forums.buildingsmart.org/u/Steffen.Rabe)\
**Replies:** 0\
**Last updated:** [June 5, 2020, 11:16am UTC](https://forums.buildingsmart.org/t/file-schema-vs-schema-version/2750 "2020-06-05T11:16:10Z")
Hello all, we faced some difficulties to import IFC4 files. The FILE\_SCHEMA tag indicated IFC4 FILE\_SCHEMA((‘IFC4’), but finally it contains data based on Schema version 4.0.2, IFC4 Add2, with some new items. As we are …
---
## [IfcAlignment2DCantSegment](https://forums.buildingsmart.org/t/ifcalignment2dcantsegment/2639)
**Author:** [@Igor.E](https://forums.buildingsmart.org/u/Igor.E)\
**Replies:** 0\
**Last updated:** [April 21, 2020, 7:50pm UTC](https://forums.buildingsmart.org/t/ifcalignment2dcantsegment/2639 "2020-04-21T19:50:57Z")
Hello Everyone, For IfcAlignment2DCantSegment such attributes are defined in IFC4X3 schema: StartDistAlong : IfcLengthMeasure; HorizontalLength : IfcPositiveLengthMeasure; StartCantLeft : IfcLengthMeasure; EndCantLe…
---
## [4x3alpha - IfcTransportElement and IfcTransportElementType](https://forums.buildingsmart.org/t/4x3alpha-ifctransportelement-and-ifctransportelementtype/2269)
**Author:** [@jonm](https://forums.buildingsmart.org/u/jonm)\
**Replies:** 3\
**Last updated:** [January 21, 2020, 7:31am UTC](https://forums.buildingsmart.org/t/4x3alpha-ifctransportelement-and-ifctransportelementtype/2269 "2020-01-21T07:31:19Z")
Serialization will be broken in comparision to previous schemas by changing the predefined type to a select. Refer https://forums.buildingsmart.org/t/existing-enumeration-constants-modifications/2243/9 Is it preferable…