User Manual 3.4.1 Facets - Historique des versions

Admin le 4 avril 2018 à 13:57

2018-04-04T13:57:53Z

← Version précédente		Version du 4 avril 2018 à 13:57
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	====Implementation====		====Implementation====
	This class implements the CrossSectionProvider interface (org.apache.commons.math.geometry.euclidean.threed).<br>		This class implements the CrossSectionProvider interface (org.apache.commons.math.geometry.euclidean.threed).<br>
	Please refer to the [{{~~JavaDoc4~~.0}}/fr/cnes/sirius/patrius/assembly/properties/features/Facet.html Javadoc] for a complete list of public methods.		Please refer to the [{{JavaDoc3.4.1}}/fr/cnes/sirius/patrius/assembly/properties/features/Facet.html Javadoc] for a complete list of public methods.

	====Instantiation====		====Instantiation====

Admin : /* Definition */

2018-04-04T12:01:15Z

Definition

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	====Definition====		====Definition====
	A facet is a surface defined by its area and a normal vector, no supposition made of its exact shape.		A facet is a surface defined by its area and a normal vector, no supposition made of its exact shape.<br>
	From those information, it can compute its cross section seen from any incidental vector.		From those information, it can compute its cross section seen from any incidental vector.<br>
	A facet is visibile only from one half-space : the cross section computed is not null only if the dot product with the incidental vector is negative.		A facet is visibile only from one half-space : the cross section computed is not null only if the dot product with the incidental vector is negative.

Admin : /* Implementation */

2018-04-04T12:01:02Z

Implementation

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	====Implementation====		====Implementation====
	This class implements the CrossSectionProvider interface (org.apache.commons.math.geometry.euclidean.threed).		This class implements the CrossSectionProvider interface (org.apache.commons.math.geometry.euclidean.threed).<br>
	Please refer to the [{{JavaDoc4.0}}/fr/cnes/sirius/patrius/assembly/properties/features/Facet.html Javadoc] for a complete list of public methods.		Please refer to the [{{JavaDoc4.0}}/fr/cnes/sirius/patrius/assembly/properties/features/Facet.html Javadoc] for a complete list of public methods.

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2018-04-04T12:00:48Z

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====Definition====
A facet is a surface defined by its area and a normal vector, no supposition made of its exact shape.
From those information, it can compute its cross section seen from any incidental vector.
A facet is visibile only from one half-space : the cross section computed is not null only if the dot product with the incidental vector is negative.

It shall be used to describe a spacecraft geometry in cross section computations for force models.

[[File:facet.PNG|center]]

====Implementation====
This class implements the CrossSectionProvider interface (org.apache.commons.math.geometry.euclidean.threed).
Please refer to the [{{JavaDoc4.0}}/fr/cnes/sirius/patrius/assembly/properties/features/Facet.html Javadoc] for a complete list of public methods.

====Instantiation====
The Facet class is built from its area and normal vector :

<syntaxhighlight lang="java">
Vector3D normalvector = new Vector3D(1.0, 5.6,-3.2);
CrossSectionProvider facet = new Facet(normalvector , 5.0);
</syntaxhighlight>

====Usage====
The Facet class proposes basic methods to get its area and normal vector.

It also provides the method getCrossSection (CrossSectionProvider interface), that shall be used this way :

<syntaxhighlight lang="java">
Vector3D incidentialBeam = new Vector3D(7.0,-2.0, 8.0);
double crossSection = facet.getCrossSection(incidentialBeam);
</syntaxhighlight>

The result is not null only if "incidentialBeam " dot product with "normalvector " is negative.

User Manual 3.4.1 Facets - Historique des versions

Admin le 4 avril 2018 à 13:57

Admin : /* Definition */

Admin : /* Implementation */

Admin : Page créée avec « ====Definition==== A facet is a surface defined by its area and a normal vector, no supposition made of its exact shape. From those information, it can compute its cross s... »

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Admin : /* Implementation */

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