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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.2 Final//FR"><!-- Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) --><!-- by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><!-- Modified Simulog 03/97 --><HTML><HEAD><TITLE>2.4 Three-dimensional meshes REFEXX</TITLE><LINK REL=STYLESHEET TYPE="text/css" HREF="./Modulef.css" TITLE="Modulef CSS"><meta name="description" value="2.4 Three-dimensional meshes REFEXX"><meta name="keywords" value="Guide6"><meta name="resource-type" value="document"><meta name="distribution" value="global"></HEAD><BODY BGCOLOR="#FFFFFF"><P> <IMG SRC="../icons/smallmod.gif" WIDTH=211 HEIGHT=50 ALIGN=BOTTOM ALT="Modulef"><A NAME=tex2html928 HREF="node37.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/previous_motif.gif" ALT="previous"></A><A NAME=tex2html932 HREF="node34.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/up_motif.gif" ALT="up"></A><A NAME=tex2html934 HREF="node39.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/next_motif.gif" ALT="next"></A><A NAME=tex2html936 HREF="node2.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/contents_motif.gif" ALT="contents"></A><A HREF="../Guide6-18/node38.html"><IMG BORDER=0 SRC="../icons/zoom18.gif" ALIGN=BOTTOM ALT="[BIG]"></A><A HREF="../Guide6-14/node38.html"><IMG BORDER=0 SRC="../icons/zoom14.gif" ALIGN=BOTTOM ALT="[Normal]"></A><A HREF="../Guide6-10/node38.html"><IMG BORDER=0 SRC="../icons/zoom10.gif" ALIGN=BOTTOM ALT="[small]"></A><BR><B> Next: </B> <A NAME=tex2html935 HREF="node39.html">3 Visualization of solutions</A><B>Up: </B> <A NAME=tex2html933 HREF="node34.html">2 Visualization of meshes</A><B> Prev: </B> <A NAME=tex2html929 HREF="node37.html">2.3 Three-dimensional meshes TRNOXX</A><B><A HREF="node2.html" >Contents</A></B><HR SIZE=3 WIDTH="75%"><H1><A NAME=SECTION04340000000000000000>2.4 Three-dimensional meshes REFEXX</A></H1> <A NAME=refexx> </A><P><P><P><b> REFEXX</b> is used to visualize three-dimensional or two-dimensional meshes (in the latter case, it adds a thirdnull coordinate to each point). It also offers numerous mesh manipulation and checking possibilities.It can also be used for assigning reference or sub-domain numbers to mesh items.<P>Differing from other graphics modules, <b> REFEXX</b> uses the principle of roll-down menus to define the numerous choices available.<P>The presentation of the screen, shown in figure <A HREF="#figecranrefe">2.14</A>, consists of several windows:<P><UL><LI> the graphics window, F1, where the plot is displayed,<LI> the main menu, in F2, the window containing the application's menu or sub-menu,<LI> the secondary menu, in F3, i.e. the menu complementary to the menu appearing in F2,<LI> a input-output zone F4,<LI> a location for a keyword in F5,<LI> a general legend in F6.</UL><P><P><A NAME=1722> </A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img68.gif"><BR><STRONG>Figure 2.14:</STRONG> <i> Organization of the windows of <b> REFEXX</b></i><A NAME=1720iOrganizationofthewindowsof1716bREFEXXb1716i1720> </A><BR><P><P>The commands can be defined in two ways:<UL><LI> by clicking the line corresponding to the command chosen in the menu (window F2),<LI> by typing on the screen the equivalent keyword (which appears in F5).</UL><P>In this manner, we move around in the tree until the desired action is selected.The inverse operation (return in reverse), is performed in the following manner:<UL><LI> click the corresponding line, i.e. the root of the tree, or<LI> click <b>>></b> QUITTER in the secondary menu, or lastly<LI> type the keyword <b>Q</b> which is equivalent to the action <b>>></b> QUITTER.</UL><P>The menus consists of two types of action:<UL><LI> actions which produce sub-menus containing more actions. These actions end with '...' indicatingthe existence of a sub-menu.<LI> "normal" actions (affective action or assigning a status).</UL><P><P><P><H2><A NAME=SECTION04341000000000000000>2.4.1 Aim and utilization limits</A></H2><P><P><P>As briefly indicated above, the aim of <b> REFEXX</b> is to plot meshes and manipulate them. In more detail, wecan:<P><UL><LI> define the plot choice by entering the observation conditions, taking the notions of visibility(parts hidden or not) into account, plotting in solid line mode or with colored-in faces,<LI> select the items to plot (references and sub-domains),<LI> define and visualize cuts, by a plane, of the object displayed on the screen,<LI> check the quality of elements graphically, in particular by animating them,<LI> move points and assign linear transformations in a mesh and save the result,<LI> enrich a mesh (assign reference and sub-domain numbers),<LI> construct the data files by extracting all, or part, of the components from the object.</UL><P>The element quality checking corresponds to tetrahedra only.<P><P><P><H2><A NAME=SECTION04342000000000000000>2.4.2 Utilization of REFEXX</A></H2><P><P><P><OL><LI> Activate preprocessor <b> REFEXX</b>.<P><LI> Choose the output terminal.<P><LI> The main menu appears (see below) in window F2.<P><LI> Enter, in window F4, the name of the file containing the mesh (validate by clicking on the return key).<P><LI> The MODULEF main menu appears.<P><LI> An automatic plot is obtained by refreshing the screen. To do this, we go to the sub-menu"MODIFIER LA VISU..." (by clicking on it in the main menu) and then click on "RAFRAICHIR".More directly, the user can type "RAF", the equivalent keyword (after typing RAF and returning, we notethat window F2 is in the state it would have been if we proceeded as indicated initially).</OL><P><P><H2><A NAME=SECTION04343000000000000000>2.4.3 Complete description of REFEXX</A></H2><P><P><P>The menus contain a certain number of choices, which are of two types:<P><DL COMPACT><DT>Type 1:<DD> the choice corresponding to the definition of an action (example "SAUVER LA SD")or a state (for example, choose a "COUPE OPAQUE"),<DT>Type 2:<DD> the choice is itself a menu containing two types of choices.<P> </DL><P><P><P>The main menu, "MODULEF", gives access to the following sub-menus:<P><P><P><PRE> MODULEF MODIFIER LA VISU TOURNER AUTOUR COUPER REFERENCES TRACEES ITEMS TRACES NUMERO INFO SUR OBJET REFERENCE POINT VERIF DU MAILLAGE AFFECTER REFERENCE REFERENCE PAR LOT CHANGER REFERENCE CONSTRUCTION DE BD TRANSFORMATION</PRE><P><P><P><DL COMPACT><DT>Main menu: "MODULEF"<DD> <P><DL COMPACT><DT>Access:<DD> Basic menu, obtained at initialization. The user returns to it when quitting (keyword"Q" or "<b>>></b> QUITTER") the sub-menus.<P> </DL><P>This menu is used to select the following items (we indicate the names of the possible options,the option type <i> in italics</i>, the equivalent keyword in UPPERCASE, and the correspondingdescription):<P><UL><LI> MODIFIER LA VISU...: <i> sub-menu</i> - MV - To modify the visualization (observation conditions, selecting the parts to visualize, assigning numbers, defining cuts, etc., see this sub-menu).<LI> INFO SUR OBJE...: <i> sub-menu</i> - INFO - To obtain information about the displayed mesh (array NOP2, numbers, references, coordinates, etc.).<LI> VERIF DU MAILLAGE...: <i> sub-menu</i> - VRF - To check the mesh by displaying the elements with animation, pointing out the bad elements, plotting the quality isovalues, etc.<LI> AFFECTER REFERENCE...: <i> sub-menu</i> - AFRF - To assign sub-domain and reference numbers to designated elements.<LI> REFERENCE PAR LOT...: <i> sub-menu</i> - RFLO - To enable the above assignment to a set of items.<LI> CHANGER REFERENCE...: <i> sub-menu</i> - CHRF - To modify the reference or sub-domain numbers of items already referenced.<LI> SAUVER LA SD: <i> action</i> - SAUV - To save a D.S. <b> NOPO</b> containing the modifications performed on the initial mesh input. The output file name will be requested: this name must be new, no name annuls the action.<LI> ENREGISTRER LA SD: <i> action</i> - ENRG - To save the current state of the D.S. ("SAUVER" also saves a D.S.).<LI> REVENIR A LA VERSION: <i> action</i> - REVV - To return to the last state saved.<LI> CONSTRUCTION DE BD...: <i> sub-menu</i> - COBD - To construct a data base of the object, its boundary or the items with a particular reference or sub-domain number.<LI> TRANSFORMATION...: <i> sub-menu</i> - TRSF - To perform geometric transformations (translation, symmetry, ...), or to move the boundary points.<LI> HARDCOPY: <i> action</i> - HARD - To activate a hardcopy of the screen.<LI> SOFTCOPY: <i> action</i> - SOFT - To activate a softcopy of the plot. The plot is reinterpreted as a function of the terminal selected, and contains comments if desired (defined below). A plot does not contain the screen menu part.</UL><P>The secondary menu of menu "MODULEF..." is as follows:<UL><LI> PLACER COMMENTAIRE: <i> action</i> - COM - To place a comment line in window F5. This line will appear on the hardcopies and softcopies.<LI> NOUVEL OBJET: <i> action</i> - NEW - To change the mesh.<LI> <b>>></b> FINIR: <i> action</i> - *FIN - To exit from <b> REFEXX</b>.</UL><P><P><A NAME=1735> </A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img69.gif"><BR><STRONG>Figure 2.15:</STRONG> <i> Example <b> REFEXX</b>: automatic mode</i><A NAME=1732iExample1728bREFEXXb1728automaticmodei1732> </A><BR><P><P><DT>Sub-menu "MODIFIER LA VISU":<DD> <P><DL COMPACT><DT>Access:<DD> Via the main menu.<P> </DL><P>This sub-menu is used to select the following items:<P><UL><LI> TOURNER AUTOUR...: <i> sub-menu</i> - TOUR - To define a rotation around the object.<LI> PLUS PRES: <i> action</i> - Z+ - To approach the object.<LI> PLUS LOIN: <i> action</i> - Z- - To move away from the object.<LI> ZOOM: <i> action</i> - Z - To zoom by assigning two points on the screen (extrema of the zoom zone).<LI> COUPER...: <i> sub-menu</i> - COUP - To perform a cut by a plane.<LI> REFERENCES TRACEES...: <i> sub-menu</i> - RFTR - To select the items to plot by choosing a reference or sub-domain number.<LI> <b>>></b> RAFRAICHIR: <i> action</i> - RAF - To refresh the screen.<LI> ITEMS TRACES...: <i> sub-menu</i> - TRAC - To define the plot mode (solid line, shrink, etc.) and the visibility notions (parts hidden).<LI> ARETES COPLANAIRES: <i> action</i> - COP - If this item is shown, the coplanar edges are plotted, if not they are not displayed.<LI> REMPLISSAGE FACES: <i> action</i> - REMP - If this item is displayed, the faces are colored-in, if not they are the same color as the background.<LI> NUMERO...: <i> sub-menu</i> - NUM - To request to plot the item numbers or the sub-domain or reference numbers.<LI> CRITERE COPLANEARITE: <i> action</i> - CCOP - To modify the criteria for deciding if two adjacent faces are coplanar (by default 0.0001).<LI> PREMIER PLAN: <i> action</i> - PRPL - To correct, in certain cases, the imperfections at the computational level of the hidden faces.<LI> VUE STANDARD: <i> action</i> - STD - To return the observer to his/her original position.<LI> VUE PRECEDENTE: <i> action</i> - PRE - To display the previous view (there is a cyclic stack with 5 contexts).<LI> VUE SUIVANTE: <i> action</i> - SUI - To display the next view (in the stack above).<LI> RECALCULE TOUT: <i> action</i> - RCAL - To update the internal arrays (numerical refreshing).<LI> STEREOSCOPIE: <i> action</i> - STER - To display the plot in stereoscopy.</UL><P>The secondary menu "MODIFIER LA VISU..." is the following:<UL><LI> <b>>></b> QUITTER: <i> action</i> - Q - Return to the main menu.</UL><P><P><A NAME=1748> </A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img69.gif"><BR><STRONG>Figure 2.16:</STRONG> <i> Example <b> REFEXX</b>: visible edges, coplanar edges eliminated</i><A NAME=1745iExample1741bREFEXXb1741visibleedgescoplanaredgeseliminatedi1745> </A><BR><P><P><DT>Sub-menu "TOURNER AUTOUR":<DD> <P><DL COMPACT><DT>Access:<DD> Via the sub-menu, "MODIFIER LA VISU" of the main menu.<P> </DL><P>This sub-menu is used to select the following items:<P><UL><LI> VERS LA DROITE: <i> status</i> - D - Move the observer to the right by an angle of 30 degrees around the Z axis (value modifiable, see secondary menu).<LI> VERS LA GAUCHE: <i> status</i> - G - Move observer to the left by an angle of 30 degrees around the Z axis (value modifiable, see secondary menu).<LI> VERS LE HAUT: <i> status</i> - H - Move the observer to the top by an elevation angle of 30 degrees (value modifiable, see secondary menu).<LI> VERS LE BAS: <i> status</i> - B - Move the observer to the bottom by an elevation angle of 30 degrees (value modifiable, see secondary menu).</UL><P>The actions are accumulated (if compatible, those actions taken into accountare in evidence in the menu) and and executed by clicking on "EXECUTION" in the secondary menu.<P><DL COMPACT><DT>Note:<DD> Once the action is evident in the menu, it will be executed at each screen refreshing(including in the case of a softcopy), thus, to delete it, it is necessary to re-click.⌨️ 快捷键说明
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