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      <title>Surface Region</title>
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      <div class="title_topic4" id="xps10_pagetitle">Surface Region</div>
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      <p class="para_topic">Surface Region enables you to create features which can help organize the regions to be machined. Once defined, these Surface Regions can be quickly and easily specified as Part and Blank geometry for multiple operations within Surface Contouring and Cavity Milling using the Surface Regions selection method. Because Surface Regions are associated with bodies, changing the body (adding, removing, modifying features) automatically updates the associated Surface Region, eliminating the need to edit or respecify the Part and Blank Geometry in the operations.</p>
      <p class="para_topic">Surface Regions may be named by keying in a name in the Surface Region Name text field. This name is a feature name (not an entity name) and will be displayed in the Model Navigation Tool and in the Modeling Features area. The Model Navigation Tool is useful in highlighting the Surface Regions for visual reference and may be used to delete Surface Regions.</p>
      <p class="para_topic">Surface Regions are created by selecting faces of a body. All faces of a Surface Region Feature must be on the same body. Three methods of defining Surface Regions (Seed, All Faces, and Selected Faces) are available in the Surface Regions dialog box under Region Type.</p>
      <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi16.gif"></p>
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               <p class="para_th">Seed</p>
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               <p class="para_td">Defines a Surface Region by specifying a Seed Face and surrounding Boundary Faces</p>
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               <p class="para_th">All Faces</p>
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               <p class="para_td">Defines a Surface Region that contains all faces of a selected body</p>
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               <p class="para_th">Selected Faces</p>
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               <p class="para_td">Defines a Surface Region by explicitly selecting faces</p>
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               <p class="para_th">Steep</p>
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               <p class="para_td">Defines Surface Regions based on the steepness of areas on the selected body</p>
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      </table><br><p class="para_topic">To summarize, the purpose of creating Surface Regions is to organize the areas to be machined, to make the selection of Part and Blank Geometry easier by enabling you to use the Surface Region selection method, and to establish associativity with bodies.</p>
      <p class="para_topic">The options available in the Surface Regions dialog box vary depending on the selected method of definition. Each of the above Surface Region definition methods and its associated options is described below.</p>
      <div class="title_division"> Seed</div>
      <p class="para_division">Seed enables you to define a Surface Region by specifying a Seed Face and surrounding Boundary Faces. The system automatically selects faces outward in all directions from the seed face, collecting faces as it goes until it encounters the defined boundary faces. Boundary faces must fully enclose the seed face as illustrated in the figure Seed Face below.</p>
      <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi15.gif"></p>
      <p class="para_division">Initially, the Seed Face button is active. The system first prompts you to select a single seed face. Once you have selected and confirmed the seed face, select the Boundary Faces button. The system then prompts you to select one or more boundary faces.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi14.gif"></p>
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      <div class="title_figure">Seed Face</div>
      <p class="para_division">Once you have selected and confirmed the boundary faces, you may select Preview Region to highlight the Surface Region before selecting OK or Apply to accept it or Cancel to reject it. Select Finished Preview to again activate the Surface Regions dialog box. The Surface Region consists of all faces contained within the boundary faces and including the seed face.</p>
      <table border="0">
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            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
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               <div class="para_note">
                  <p class="para_note_body">As stated earlier, Surface Regions automatically update when the associated bodies are modified. If the seed face is suppressed, the Surface Region Feature will be suppressed. If the seed face is deleted, the Surface Region Feature will be deleted.</p>
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      <p class="para_division">If Tangential Edge Angle is toggled ON, the system determines the faces to be included in the Surface Region based on the relative angle of normal vectors along adjacent edges of neighboring faces. This is useful, for example, if you wish to create a region on a die face that includes all of the faces with tangent edges and stops at the corner edges. As faces are collected outward in all directions from the seed face, the system compares the angles of normal vectors (one face included in the region, the other its neighbor) to the user specified Angle Tolerance. If the normals between the two faces exceed the user specified tolerance at the edges, the neighboring face is not added to the Surface Region. This option helps eliminate the need to select Boundary Faces to contain the Surface Region.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi13.gif"></p>
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      <div class="title_figure">Tangential Edge Angle</div>
      <p class="para_division">If Traverse Interior Edges is toggled ON, the system includes those faces in the Surface Region whose edges form part or all of any of the regions interior loops as illustrated below.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_newfi08.gif"></p>
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      <div class="title_figure">Traverse Interior Edges</div>
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               <div class="para_note">
                  <p class="para_note_body">&nbsp;When you turn Traverse Interior Edges ON, you may need to add boundary faces to stop the system from collecting faces. For example, in the part illustrated below, the cylindrical faces inside the two holes had to be selected as additional boundary faces. Otherwise, the system would have continued collecting faces through the holes and onto the other side of the part.</p>
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      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_newfi07.gif"></p>
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      <div class="title_figure">Traverse Interior Edges</div>
      <p class="para_division">Confirm Upon Apply displays an additional dialog after you choose Apply that lets you accept or reject the displayed exterior edge. If you reject the results, the system retains your input so you may continue selecting.</p>
      <div class="title_division"> All Faces</div>
      <p class="para_division">All Faces enables you to define a Surface Region that contains all faces of a selected body. If multiple bodies are selected, a Surface Region is created for each body.</p>
      <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi12.gif"></p>
      <p class="para_division">Class Selection displays the Class Selection dialog box enabling you to select sheets and/or solid bodies.</p>
      <p class="para_division">Once you have selected the desired bodies, you may select Preview Region (followed by Finished Preview) to highlight the Surface Region before accepting or rejecting it.</p>
      <div class="title_division"> Selected Faces</div>
      <p class="para_division">Selected Faces enables you to define a Surface Region by explicitly selecting faces. If faces are selected from different bodies, then separate Surface Regions are created for each body.</p>
      <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi11.gif"></p>
      <p class="para_division">Class Selection displays the Class Selection dialog box enabling you to select specific types of faces.</p>
      <p class="para_division">Once you have selected the desired faces, you may select Preview Region (followed by Finished Preview) to highlight the Surface Region before accepting or rejecting it.</p>
      <div class="title_division"> Steep</div>
      <p class="para_division">Steep enables you to define Surface Regions based on the steepness of areas on the selected body. Areas of the body that are within the specified angular range relative to a specified direction vector are considered steep. Since steep areas may transition within a face, faces may be split and edges added where necessary so that each face is classified entirely as either steep or non-steep. Surface Regions are then created from steep faces, non-steep faces, or both.</p><a name="mainmenu_main_surfreg_steep_areas"></a><div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi10.gif"></p>
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      <div class="title_figure">Steep Areas</div>
      <p class="para_division">Unwanted faces (the vertical faces and the underside of the part in the above illustration) may be selectively excluded from Surface Regions.</p>
      <p class="para_division">Surface Regions created from steep faces and non-steep faces may be used in separate operations to avoid generating large scallops which can result when used in a single operation.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi09.gif"></p>
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      <div class="title_figure">Large Scallops on Steep Areas</div>
      <p class="para_division">The following figure illustrates how the creation of large scallops can be avoided by machining steep regions and non-steep regions in separate operations. The Surface Contouring operation uses Zig-Zag to machine the non-steep regions. The Cavity Mill operation uses Profile to machine the steep regions.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi08.gif"></p>
      </div>
      <div class="title_figure">Avoiding Large Scallops</div>
      <p class="para_division">Steep regions can be further limited by specifying a Cut Direction vector. This vector should be specified so that it is parallel the Zig or Zig-Zag cut direction of the operation in which the large scallops are created. By doing this, the Cut Direction vector enables the system to create a limited steep region which can be used in subsequent operations to remove large scallops.</p>
      <p class="para_division">The following figure illustrates how a limited steep region is created from a specified Cut Direction Vector and how that region is used in a subsequent operation to remove large scallops.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi07.gif"></p>
      </div>
      <div class="title_figure">Removing Large Scallops</div>
      <p class="para_division">The system uses isocline curves to distinguish steep from non-steep areas. If you delete the isocline curve (in the Model Navigation Tool), the associated Surface Regions are deleted as well. Refer to the Extract section of the Points and Curves II chapter in the Modeling User Manual for more information on isocline curves.</p>
      <p class="para_division">When using Steep to define Surface Regions, you should first be sure the Angle from Direction, Direction, and Steep Option parameters are specified appropriately (these options are described below). Select a single body (the Body button is active) and then OK. You may also selectively exclude faces from the Surface Region using Exclude Faces. Select Apply. This creates an isocline feature and one or two region features.</p>
      <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi06.gif"></p>
      <p class="para_division">Exclude Faces prompts you to select one or more faces to exclude from the Surface Region. Select the faces to exclude and then Apply to create the Surface Region. One or more Surface Regions may be created depending on the specified Steep Option.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi05.gif"></p>
      </div>
      <div class="title_figure">Excluding Selected Steep Faces</div>
      <div class="title_division">Angle From Dir.</div>
      <p class="para_division">Angle From Direction enables you to specify an angular range referenced from the specified Direction vector. This range allows the system to distinguish steep from non steep areas (see  <a class="links" href="javascript:void(0)" onclick="top.openFile('mfggeneral/main_surfreg.html#mainmenu_main_surfreg_steep_areas');return(false);">Steep Areas</a> figure). Areas of the body where the angle created by the normals on the face with respect to the direction plane is less than the specified angle are considered steep.
      </p>
      <div class="title_division">Direction</div>
      <p class="para_division">Direction is the vector from which the Angle From Direction is referenced (see Steep Areas figure). This option displays the Vector Constructor dialog box, enabling you to create a &quot;smart vector&quot; associated with the selected geometry. This vector should generally be defined to match the tool axis.</p>
      <div class="title_division">Steep Option</div>
      <p class="para_division">Steep Option enables you to specify Steep Faces, Non Steep Faces or Both steep and non-steep faces to be used in creating Surface Regions. The following figure illustrates possible combinations of Surface Regions that may be created using a vertical Direction vector and a 35 degree Angle From Direction.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi04.gif"></p>
      </div>
      <div class="title_figure">Surface Regions using Steep and Non Steep Faces</div>
      <div class="title_division">Confirm Upon Apply</div>
      <p class="para_division">Confirm Upon Apply allows you to view the Surface Regions before actually accepting them. An additional dialog box is displayed after selecting Apply enabling you to accept or reject the displayed Surface Regions. If you reject the results, the system retains your input so you may continue selecting.</p>
      <div class="title_division">Limit Steep, Cut Direction</div>
      <p class="para_division">Limit Steep allows you to further limit steep regions by specifying a Cut Direction vector. This vector should be specified so that it is parallel the Zig or Zig-Zag cut direction of the operation in which the large scallops are created. By doing this, the Cut Direction vector enables the system to create a limited steep region which can be used in subsequent operations to remove large scallops.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/mm_prepgeo_sufi03.gif"></p>
      </div>
      <div class="title_figure">Limited Steep Surface Region</div>
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