## On this page
# Class CrossSectionBase
Last update: 09.03.2026
Namespace: [VM.Managed.DAFUL.Beam](VM.Managed.DAFUL.Beam.md)
Assembly: VM.Models.FE.BeamCrossSection.dll
```csharp
public class CrossSectionBase
```
#### Inheritance
object ← [CrossSectionBase](VM.Managed.DAFUL.Beam.CrossSectionBase.md)
#### Derived
[CIRCULAR](VM.Managed.DAFUL.Beam.CIRCULAR.md), [ELLIPTICAL](VM.Managed.DAFUL.Beam.ELLIPTICAL.md), [HOLLOW\_RECTANGULAR](VM.Managed.DAFUL.Beam.HOLLOW_RECTANGULAR.md), [HOLLOW\_TAPERED\_CIRCULAR](VM.Managed.DAFUL.Beam.HOLLOW_TAPERED_CIRCULAR.md), [I\_BEAM](VM.Managed.DAFUL.Beam.I_BEAM.md), [RECTANGULAR](VM.Managed.DAFUL.Beam.RECTANGULAR.md), [THIN\_TUBE](VM.Managed.DAFUL.Beam.THIN_TUBE.md), [T\_BEAM](VM.Managed.DAFUL.Beam.T_BEAM.md)
#### Extension Methods
[LinkPropertyItemCache.GetLinkProperties(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkProperties_System_Object_VM_Models_Pre_LinkPropertyType_), [LinkPropertyItemCache.GetLinkPropertiesAndValues(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkPropertiesAndValues_System_Object_VM_Models_Pre_LinkPropertyType_), [LinkPropertyItemCache.GetLinkedObjects<T>(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkedObjects__1_System_Object_VM_Models_Pre_LinkPropertyType_)
## Constructors
### CrossSectionBase()
```csharp
public CrossSectionBase()
```
## Fields
### m\_nGeomInfoArrayCount
```csharp
protected uint m_nGeomInfoArrayCount
```
#### Field Value
uint
### m\_nNastranArrayCount
```csharp
protected uint m_nNastranArrayCount
```
#### Field Value
uint
## Properties
### pi
```csharp
protected double pi { get; }
```
#### Property Value
double
## Methods
### CheckDensity(double)
```csharp
protected void CheckDensity(double dDensity)
```
#### Parameters
`dDensity` double
### CheckGeomInfo(double\[\])
```csharp
public void CheckGeomInfo(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
### CheckInputCount(double\[\])
```csharp
protected void CheckInputCount(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
### CheckLength(double)
```csharp
protected void CheckLength(double dLength)
```
#### Parameters
`dLength` double
### CheckMass(double)
```csharp
protected void CheckMass(double dMass)
```
#### Parameters
`dMass` double
### GenerateMultiSection(double\[\], int)
```csharp
public virtual double[] GenerateMultiSection(double[] dSInfo, int ElementCount)
```
#### Parameters
`dSInfo` double\[\]
`ElementCount` int
#### Returns
double\[\]
### GenerateOneSection(double\[\])
```csharp
public virtual double[] GenerateOneSection(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
#### Returns
double\[\]
### GeneratePostConnectivities(int, ref int\[\], ref int\[\])
```csharp
public virtual int GeneratePostConnectivities(int RenderingType, ref int[] iENodes, ref int[] iStartENodes)
```
#### Parameters
`RenderingType` int
`iENodes` int\[\]
`iStartENodes` int\[\]
#### Returns
int
### GeneratePostOneSection(double\[\], int)
```csharp
public virtual double[] GeneratePostOneSection(double[] dSInfo, int RenderingType = 1)
```
#### Parameters
`dSInfo` double\[\]
`RenderingType` int
#### Returns
double\[\]
### GeneratePostTwoSection(double\[\], double\[\], double\[\], double\[\], double\[\], int)
```csharp
public virtual double[] GeneratePostTwoSection(double[] dSInfo, double[] dStartPoint, double[] dEndPoint, double[] dStartOri, double[] dEndOri, int RenderingType)
```
#### Parameters
`dSInfo` double\[\]
`dStartPoint` double\[\]
`dEndPoint` double\[\]
`dStartOri` double\[\]
`dEndOri` double\[\]
`RenderingType` int
#### Returns
double\[\]
### GenerateTwoSection(double\[\], double\[\], double\[\], double\[\])
```csharp
public double[,] GenerateTwoSection(double[] dSInfo, double[] dStartPoint, double[] dEndPoint, double[] dOrienMatrix)
```
#### Parameters
`dSInfo` double\[\]
`dStartPoint` double\[\]
`dEndPoint` double\[\]
`dOrienMatrix` double\[\]
#### Returns
double\[,\]
### GetArea(double\[\])
```csharp
public virtual double GetArea(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
#### Returns
double
### GetAreaProperties(double\[\], double)
```csharp
public virtual double[] GetAreaProperties(double[] dSInfo, double dPoissonRatio)
```
#### Parameters
`dSInfo` double\[\]
`dPoissonRatio` double
#### Returns
double\[\]
### GetAsy(double\[\], double)
```csharp
public virtual double GetAsy(double[] dSInfo, double dPoissonRatio)
```
#### Parameters
`dSInfo` double\[\]
`dPoissonRatio` double
#### Returns
double
### GetAsz(double\[\], double)
```csharp
public virtual double GetAsz(double[] dSInfo, double dPoissonRatio)
```
#### Parameters
`dSInfo` double\[\]
`dPoissonRatio` double
#### Returns
double
### GetIxx(double\[\])
```csharp
public virtual double GetIxx(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
#### Returns
double
### GetIyy(double\[\])
```csharp
public virtual double GetIyy(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
#### Returns
double
### GetIzz(double\[\])
```csharp
public virtual double GetIzz(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
#### Returns
double
### GetJxx(double, double, double)
```csharp
public double GetJxx(double dIxx, double dDensity, double dLength)
```
#### Parameters
`dIxx` double
`dDensity` double
`dLength` double
#### Returns
double
### GetJxx(double\[\], double, double)
```csharp
public double GetJxx(double[] dSInfo, double dDensity, double dLength)
```
#### Parameters
`dSInfo` double\[\]
`dDensity` double
`dLength` double
#### Returns
double
### GetJyy(double, double\[\], double, double)
```csharp
public virtual double GetJyy(double dMass, double[] dSInfo, double dDensity, double dLength)
```
#### Parameters
`dMass` double
`dSInfo` double\[\]
`dDensity` double
`dLength` double
#### Returns
double
### GetJyy(double\[\], double, double)
```csharp
public virtual double GetJyy(double[] dSInfo, double dDensity, double dLength)
```
#### Parameters
`dSInfo` double\[\]
`dDensity` double
`dLength` double
#### Returns
double
### GetJzz(double, double\[\], double, double)
```csharp
public virtual double GetJzz(double dMass, double[] dSInfo, double dDensity, double dLength)
```
#### Parameters
`dMass` double
`dSInfo` double\[\]
`dDensity` double
`dLength` double
#### Returns
double
### GetJzz(double\[\], double, double)
```csharp
public virtual double GetJzz(double[] dSInfo, double dDensity, double dLength)
```
#### Parameters
`dSInfo` double\[\]
`dDensity` double
`dLength` double
#### Returns
double
### GetMass(double\[\], double, double)
```csharp
public double GetMass(double[] dSInfo, double dDensity, double dLength)
```
#### Parameters
`dSInfo` double\[\]
`dDensity` double
`dLength` double
#### Returns
double
### GetMassMomentOfInertia(double, double, double\[\], double, double)
```csharp
public virtual double[] GetMassMomentOfInertia(double dMass, double dIxx, double[] dSInfo, double dDensity, double dLength)
```
#### Parameters
`dMass` double
`dIxx` double
`dSInfo` double\[\]
`dDensity` double
`dLength` double
#### Returns
double\[\]
### GetMassProperties(double\[\], double, double)
```csharp
public virtual double[] GetMassProperties(double[] dSInfo, double dDensity, double dLength)
```
#### Parameters
`dSInfo` double\[\]
`dDensity` double
`dLength` double
#### Returns
double\[\]
### GetNumSideEdges(int)
```csharp
public virtual int GetNumSideEdges(int RenderingType = 1)
```
#### Parameters
`RenderingType` int
#### Returns
int
### GetNumTotalElements(int)
```csharp
public virtual int GetNumTotalElements(int RenderingType = 1)
```
#### Parameters
`RenderingType` int
#### Returns
int
### GetNumTotalNodes(int)
```csharp
public virtual int GetNumTotalNodes(int RenderingType = 1)
```
#### Parameters
`RenderingType` int
#### Returns
int
### GetRequiredInputCount(CrossSectionType)
```csharp
public virtual uint GetRequiredInputCount(CrossSectionType sectionEnumType)
```
#### Parameters
`sectionEnumType` [CrossSectionType](VM.Managed.DAFUL.Beam.CrossSectionType.md)
#### Returns
uint
### GetSphereBodyRadius(double\[\])
```csharp
public virtual double GetSphereBodyRadius(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
#### Returns
double
### GetStiffnessElementsOfMatrixForceByCoef(double, double, double, double, double, double, double, double, double, double, double)
```csharp
public double[] GetStiffnessElementsOfMatrixForceByCoef(double dArea, double dIyy, double dIzz, double dIxx, double dAsy, double dAsz, double dLength, double dPoissonRatio, double dDensity, double dYoungsModulus, double dShearModulus)
```
#### Parameters
`dArea` double
`dIyy` double
`dIzz` double
`dIxx` double
`dAsy` double
`dAsz` double
`dLength` double
`dPoissonRatio` double
`dDensity` double
`dYoungsModulus` double
`dShearModulus` double
#### Returns
double\[\]
### GetStiffnessElementsOfMatrixForceByGeom(double\[\], double, double, double, double, double)
```csharp
public double[] GetStiffnessElementsOfMatrixForceByGeom(double[] dSInfo, double dLength, double dPoissonRatio, double dDensity, double dYoungsModulus, double dShearModulus)
```
#### Parameters
`dSInfo` double\[\]
`dLength` double
`dPoissonRatio` double
`dDensity` double
`dYoungsModulus` double
`dShearModulus` double
#### Returns
double\[\]
### SetVariablesFromArray2Local(double\[\])
```csharp
protected virtual void SetVariablesFromArray2Local(double[] dSInfo)
```
#### Parameters
`dSInfo` double\[\]
### TranslateNastran2DAFUL(double\[\])
```csharp
public virtual double[] TranslateNastran2DAFUL(double[] dNastran)
```
#### Parameters
`dNastran` double\[\]
#### Returns
double\[\]
### cos(double)
```csharp
protected double cos(double a)
```
#### Parameters
`a` double
#### Returns
double
### mattrvec(double\[\], double\[\])
```csharp
protected double[] mattrvec(double[] a, double[] b)
```
#### Parameters
`a` double\[\]
`b` double\[\]
#### Returns
double\[\]
### matvec(double\[\], double\[\])
```csharp
protected double[] matvec(double[] a, double[] b)
```
#### Parameters
`a` double\[\]
`b` double\[\]
#### Returns
double\[\]
### sin(double)
```csharp
protected double sin(double a)
```
#### Parameters
`a` double
#### Returns
double