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Welcome to the PTVR web site

TO DO:

Questions et/ou à définir avec Pierre (à discuter de vive voix, i.e. pas urgent) :

– est ce que je peux essayer avec d’autres thèmes wordpress ?

– Comment mettre 2 figures côte à côte ?

– Sur la page web, la  partie ascenseur à gauche prend trop de largeur.

– comment gérer l’interligne dans le texte simple ?

 

Les TESTS préliminaires:

Commencons par une formule :

Latex formula

 

 

Coordinates Systems (c’est le heading 1)

Spherical coordinate systems (c’est le heading 2)

The perimetric System (c’est le heading 3)

Static image of the perimetric system (figure created with GeoGebra)

Terminology for the 3 coordinates in PTVR is shown in the figure on the right:

– Half-meridian (from 0° to 360°) – abbreviation : HM

– Eccentricity (from 0° to 180°) – abbreviation : Ecc

– Radial distance (in meters) – abbreviation : RD

Distance (in meters) between Origin and P (not shown in the figure for clarity)

 

The point P in the world is defined here by the following coordinates (HM: 135 °, Ecc: 20°, RD: any value value in meters)

 

 

 

The following figure is a horizontal rotation (i.e. about the Y axis) of the perimetric system to help visualize its 3D structure.

Horizontal rotation (i.e. about Y axis) of the perimetric system (created with GeoGebra)

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The following figure helps visualize the effect of varying the Half-meridian from 0° to 360° (while keeping Eccentricity constant at 15°).

Constant eccentricity (15°) + varying Half-meridian from 0° to 360° (created with GeoGebra)

 

 

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The following figure helps visualize the effect of varying the Eccentricity from 0° to 30° (while keeping Half-meridian constant at 135°).

Constant Half-meridian angle (135°) + varying eccentricity from 0° to 30° (created with GeoGebra)

 

 

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tempus, sagittis varius ex molestie.

 

 

 

 

 

 

 

Projection of Spherical coordinate systems on plane (c’est le heading 2)

The perimetric System (c’est le heading 3)

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Projection of P on a fronto-parallel plane : constant Eccentricity (15°) with varying Half-meridian from 0° to 360° (created with GeoGebra)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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