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<h1 class="firstHeading">3D ACIS PHL V5</h1>
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<p>Though 3D is now the de facto CAD standard in most engineering disciplines, 2D still has a place in industries such as technical illustration, manufacturing, and <a href="/r18/index.php/Architecture" title="Architecture">architecture</a>. Because 3D models are the typical primary output for CAD design, users in these industries require an efficient and accurate method of generating 2D computational drawings directly from the 3D models. Hidden line removal (HLR) is an important aspect of creating an accurate 2D representation from a 3D model. Using HLR, the converted model only displays those parts visible from a given perspective; hidden (or occluded) edges normally included in a 3D model representation are removed, or drawn in a line style that indicates their obscured position.</p><table id="toc" class="toc" summary="Contents"><tr><td><div id="toctitle"><h2>Contents</h2></div><ul><li class="toclevel-1"><a href="#Fast.2C_Accurate.2C_and_Reliable_HLR_Computation"><span class="tocnumber">1</span> <span class="toctext">Fast, Accurate, and Reliable HLR Computation</span></a></li><li class="toclevel-1"><a href="#ACIS_PHL_V5_Functionality"><span class="tocnumber">2</span> <span class="toctext">ACIS PHL V5 Functionality</span></a><ul><li class="toclevel-2"><a href="#Edge_Classification"><span class="tocnumber">2.1</span> <span class="toctext">Edge Classification</span></a></li><li class="toclevel-2"><a href="#Exact_or_Polyline_Edge_B-Rep"><span class="tocnumber">2.2</span> <span class="toctext">Exact or Polyline Edge B-Rep</span></a></li><li class="toclevel-2"><a href="#Adjustable_Levels_of_Accuracy"><span class="tocnumber">2.3</span> <span class="toctext">Adjustable Levels of Accuracy</span></a></li></ul></li></ul></td></tr></table><script type="text/javascript"> if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } </script><a name="Fast.2C_Accurate.2C_and_Reliable_HLR_Computation"></a><h2> <span class="mw-headline"> Fast, Accurate, and Reliable HLR Computation </span></h2><p>To add a measure of control, ACIS PHL V5 also allows users to customize the level of hidden line resolution calculations to match the accuracy required by their specific applications. The combination of performance, reliability, and precision delivered by ACIS PHL V5 make it an excellent choice for CAD, CAM, technical illustration, or any modeling or viewing application that needs to generate hidden line or planar projectable views of ACIS models.</p><div class="center"><div class="thumb tnone"><div class="thumbinner" style="width:182px;"><a href="/r18/index.php/Image:SPAhlr_wireframe.gif" title="Image:SPAhlr wireframe.gif">Image:SPAhlr wireframe.gif</a> <div class="thumbcaption">PHL V5: Wireframe Display of a 3D Model</div></div></div></div><div class="center"><div class="thumb tnone"><div class="thumbinner" style="width:182px;"><a href="/r18/index.php/Image:SPAhlr_dashed.gif" title="Image:SPAhlr dashed.gif">Image:SPAhlr dashed.gif</a> <div class="thumbcaption">PHL V5: Dashed Hidden Line Display of a 3D Model</div></div></div></div><div class="center"><div class="thumb tnone"><div class="thumbinner" style="width:182px;"><a href="/r18/index.php/Image:SPAhlr.gif" title="Image:SPAhlr.gif">Image:SPAhlr.gif</a> <div class="thumbcaption">PHL V5: Hidden Line Removal of a 3D Model</div></div></div></div><p>Model designed by a student of Professor Mathieu Laruelle, Lycee d'Enseignement Industriel</p><a name="ACIS_PHL_V5_Functionality"></a><h2> <span class="mw-headline"> ACIS PHL V5 Functionality </span></h2><a name="Edge_Classification"></a><h3> <span class="mw-headline"> Edge Classification </span></h3><p>Applications use this information to determine which lines and line styles to draw. ACIS PHL V5 analyzes ACIS <a href="/r18/index.php?title=Surface&action=edit" class="new" title="Surface">surface</a> and solid models and classifies all edges and silhouettes into the following designations:</p><ul><li> Visible - Lines that are unobstructed and visible from the current perspective; for example, the front edges of a cube are visible.</li><li> Hidden - Edges that are hidden by material in the current perspective; for example, in a slightly nonorthogonal view of a cube, edges along the rear side of the shape.</li><li> Occluded - Edges that are obscured by another edge. For example, in a 45-degree view of a cube, the front vertical edge occludes the rear vertical edge. When viewing a visible edge (solid line) overlaying an occluded edge (dashed line), the visual confusion is reduced by removing the occluded line.</li></ul><a name="Exact_or_Polyline_Edge_B-Rep"></a><h3> <span class="mw-headline"> Exact or Polyline Edge B-Rep </span></h3><ul><li> <a href="/r18/index.php?title=Curve&action=edit" class="new" title="Curve">Curve</a> Representation - ACIS PHL V5 provides two curve representations for drawing a model with HLR. For applications that need the exact curve representation, a pointer to the model data accesses the <a href="/r18/index.php?title=Geometry&action=edit" class="new" title="Geometry">geometry</a> of the edge. ACIS PHL V5 also provides a polyline approximation of the curve for applications that do not require this level of precision.</li><li> Thickening/thinning - ACIS PHL V5 has the ability to identify exterior edges on the model and display them as "thick" or interior lines as "thin," as well as adjusting line thickness where visual convexity changes. This helps to increase the perceived depth of a model's hidden line representation. This is excellent for technical illustration and other viewing applications.</li><li> Smoothing - Contour lines created by changes in the 3D model's surface are often irrelevant in 2D drawings, and may be eliminated using this function.</li></ul><a name="Adjustable_Levels_of_Accuracy"></a><h3> <span class="mw-headline"> Adjustable Levels of Accuracy </span></h3><p>For ease of use, ACIS PHL V5 automatically calibrates the accuracy of the hidden line calculations based on model extents. This accuracy can be manually overridden by users who need to control how closely the hidden line removal view matches the model's precise curve and surface data.</p><p>For more information and a PHL V5 example, refer to the section <strong class="selflink">3D ACIS PHL V5</strong>.</p><!-- Tidy found serious XHTML errors --><!-- Saved in parser cache with key r18_docdb-r18doc_:pcache:idhash:432-0!1!0!!en!2!edit=0 and timestamp 20080623104241 --><div class="printfooter">⌨️ 快捷键说明
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