Topics. Las Vegas, Nevada, December 3 6, Speaker Name: Timothy A. Del Vescovo. Course Title: Put A Lid On It Roofing Your Building

Transcription

1 Las Vegas, Nevada, December 3 6, 2002 Speaker Name: Timothy A. Del Vescovo Course Title: Put A Lid On It Roofing Your Building Course ID: AR41-5L Course Outline: One of the most powerful, misunderstood, and under exploited feature sets in Autodesk Architectural Desktop R3.3 is its roofing functions. If you ve ever wanted to learn how to create elaborate roofing systems for your buildings, this course will show you how to accomplish this. With ADT, it s easy to move beyond boring flats and standard hips. Topics Adding A Roof Object Modifying A Roof Object Converting To A Roof Object Roof Slabs Roof Slab Edge Styles Roof Slab Styles Converting A Roof Object To A Roof Slab Adding A Roof Slab Modifying Roof Slab Properties Roof Slab Tools Mitering A Roof Slab Cutting A Roof Slab Adding And Removing Holes In A Roof Slab Roof Dormers Boolean Operations Adding And Removing A Vertex Final Touches

2 Put A Lid On It Roofing Your Building Autodesk Architectural Desktop provides two different object types for creating roofs: Roof Objects and Roof Slabs. This lab will explore the functionality of each object type placing a strong emphasis on working with style based roof slabs. Roof Object Figure 1 Roof Slab with Slab Edge Style Applied Adding A Roof Object Roof objects are single 3D component objects that allow for quick creation of simple and complex roof designs. There is a 2D component, an eave, designating the eave s location on the roof object. Sloped and flat roofs can be generated from entered points, walls or polylines. A roof object typically covers an entire roof area with its properties being set during its creation. Properties that can be set are: Roof Shape, Roof Slope, Plate Height, Upper Height on Double Sloped Roofs, Overhang, Gables, Roof Thickness and Edge Orientation. Lab: Adding A Roof Object: Click on the Roof Object Add layout tab. Make the lower viewport active. From the Design menu choose Roofs Add Roof. Click on Shape Drop Down menu and set it to DoubleSlope and set the rest of the properties to match Figure 2. Click on exterior walls at the corners starting with Pt 1, Pt 2, Pt 3. After clicking Pt 3, change the shape to SingleSlope and click in Pt 4. Now click the Gable box in the Add Roof dialogue and click in Pt 5. Deselect the Gable box and click in Pt 6. Change the shape back to DoubleSlope and click in points Pt 7, Pt 8, and Pt 9. After clicking Pt 9, change the shape to SingleSlope and click in Pt 10. Now click the Gable box in the Add Roof dialogue and click in Pt 11. Deselect the Gable box and click in Pt 12. Change the shape back to DoubleSlope and hit the Enter key. Figure 2 2

3 Modifying A Roof Object A Roof Object can be modified through the Roof Modify dialogue box (Right Click The Roof Roof Modify) or by Grip Editing its grip points. Let s modify the South grip point of the lower roof slope on the front of the garage. Lab: Modify A Roof Object: Grip Editing / Auto Project Walls: Click on the grip as shown in Figure 3 and drag downward past the roof s eave and click once, then hit the Escape key once. The roof s geometry has been altered. See Figure 3b. The walls now need to be modified to meet the new roof configuration. Figure 3b Figure 3a Figure 3c To project the walls up to the new roof shape: Right Click The Front Wall Model Tools Roof Line Select A (for Auto Project) Hit Enter Select The Roof. Hit Enter Once More To Exit Command. The wall has now been projected up to the roof. Repeat for the six walls at the bump outs below the two gables. See Figure 3c. Note that the Roof Line Auto Project will work on multiple walls concurrently. Converting To A Roof Object As stated above, sloped and flat roofs can be generated from walls or polylines by converting those entities into roof objects. Let s convert a polyline that defines the exterior footprint of a guest house into a roof object. Then, after generating a roof, repeat the command and generate another roof over the actual guest house. Lab: Converting To A Roof Object: Click on the Roof Object Convert layout tab. Make the lower viewport active. From the Design menu choose Roofs Convert To Roof. Select the Polyline Hit Enter Answer No for Erasing Layout Geometry. Click on 3

4 Shape Drop Down menu and set it to SingleSlope and set the rest of the properties to match Figure 4a. Hit OK and view the result. Now, repeat the Convert To Roof command and select the all of the objects that make up the guest house. The command will filter out any entities that do not comply. The result will look like Figure 4b. Figure 4a Figure 4b Note: If a gable is desired for the front entry portico, simply Grip Edit the roof at the point where the hip is and drag the point forward of the portico. Then, Auto Project the wall up to the roof. 4

5 Roof Slabs Roof slabs are style-based multiple component objects that allow for quick creation of roof designs. Sloped and flat roofs can be generated from entered points, walls, polylines or roof objects. A Roof Slab Style provides controls over how it s edges are represented through Roof Slab Edge Styles. Using Roof Slab Styles with Roof Slab Edge Styles defined, simple or complex fascia and soffit designs can be created. Roof Slab Edge Styles Conceptually, creating a Roof Slab Style that will contain a Roof Slab Edge Style for a Baseline or Perimeter Edge needs to have those edge styles defined. Although Roof Slab Edge Styles can be created at anytime and later added to a Roof Slab Style by modifying that style in the Style Manager, we will create the Roof Slab Edge Style first. A Roof Slab Edge Style contains Prolfiles for fascia and soffit designs. Lab: Roof Slab Edge Styles (Creating Profiles): Click on the Roof Slab Styles layout tab. Make the lower viewport active. We will begin by creating fascia and soffit profiles to be used in a Roof Slab Edge Style. From the Desktop menu choose Profiles Profile Definitions. See Figure 5a. The Style Manager opens with only Profiles being filtered. Create a new Profile by: Right Clicking Within The Profile List And Choosing New Right Click New Style And Rename It To _8in Fascia w Gutter Right Click The Profile Again And Choose Set From (See Figure 5b) Select The Closed Polyline On The Left (See Figure 5c) Answer no To Add another ring? Choose The Upper Left Corner For Insertion Point (As Indicated In Figure 5c). Repeat The Above Steps And Create Another Profile (For A Soffit) With The Name _10in Crown w Band From The Profile On The Right (As Indicated In Figure 5c). Figure 5a Note: The soffit profile is created to disappear behind the face of the wall making the 4 band below appear separate from the soffit. Figure 5c Figure 5b 5

6 Lab: Roof Slab Edge Styles (Creating A Style): Click on the Roof Slab Styles layout tab if it is not still current. Make the lower viewport active. To create a Roof Slab Edge Style: From the Design menu choose Roofs Roof Slab Edge Styles. The Style Manager Opens Up. (Only Roof Slab Edge Styles Are Filtered) Also, selecting a style brings up the Viewer. See Figure 5d. Right Click In The Window (Within The Style List Or Anywhere In The Right Hand Window If List Is Showing) Choose New Rename The New Style To _8in Fascia w 24x10in Soffit Right Click The Your New Style And Choose Edit The Roof Slab Edge Style Dialogue Opens Up. Figure 5d Click On The Defaults Tab Set The Overhang To 24, Set The Orientation To Plumb, Set The Angle To 0. See Figure 5e. Click On The Design Rules Tab Click On The Fascia Check Box And Select _8in Fascia w Gutter From The Pull Down List. Click On The Soffit Check Box And Select _10in Crown w Band From The Pull Down List. Figure 5e Deselect Any Auto-Adjust Boxes, Set The Y Direction Offset to 8. See Figure 5f. Click The OK Button Click OK To Exit Style Manager. Result Figure 5f 6

7 Roof Slab Styles Now that we have created an edge style, let s create the actual roof style. Lab: Roof Slab Styles: Click on the Roof Slab Styles layout tab if it is not still current. Make the lower viewport active. To create a Roof Slab Styles: From the Design menu choose Roofs Roof Slab Styles. The Style Manager Opens Up. (Only Roof Slab Styles Are Filtered) See Figure 5g. Also, selecting a style brings up the Viewer. See Figure 5g. An easy way to create a new style is to copy an existing style. Right Click The Standard Style Choose Copy Right Click (Within The Style List) And Choose Paste Right Click The Standard (2) Style Choose Rename Rename The Style To _06 Thk w 08F+10S+24 OHang Right Click Your New Style And Choose Edit. Figure 5g Click The Defaults Tab Set The Thickness To 6 (Note That This Is Just The Default Setting That Can Be Changed When A Slab Is Created) Choose An Edge Style: Under E Baseline Edge Select _8in Fascia w 12x10in Soffit from The Drop Down Menu See Figure 5h. Click The Design Rules Tab Make Sure Has Fixed Thickness Is Not Checked. See Figure 5i. Figure 5h Figure 5i 7

8 Sometimes it is useful to only show the perimeter roof edge when working on a Floor Plan. There are several ways to accomplish this. An easy way to show the roof s edge is to control it through the Display Properties. Click The Display Props Tab Click Roof Slab Style Click The Attach Override Button (Make sure you are in the Plan Display Representation. See Figure 5j.) Click The Edit Display Props Button Click The Layer/Color/Linetype Tab Turn The Visibility Off For All Components Except For Cut Line And Warning, Set Cut Line s Color to 193 and Linetype to Hidden2. Click The Other Tab Set The Cut Plane To 10-0 Click OK (See Figure 5m For An Example Of A Slab Style With This Override On.) Click The Remove Override Button Click OK Click OK Exit Style Manager. Figure 5j Figure 5k Figure 5l Figure 5m 8

9 Converting A Roof Object To A Roof Slab Since a roof object typically covers an entire roof area, it is sometimes easier to generate a roof slab by converting from a roof object. Lab: Converting To A Roof Slab: Click on the Roof Slab Convert layout tab. Make the lower viewport active. Right Click Roof Object Convert To Roof Slabs Answer yes For Erasing Layout Geometry (The Roof Object) Hit Enter (Accepting Standard As The Roof Slab Style). Slabs for each roof surface have been created. The new roof slabs inherent the roof object properties such as Plate Height, Roof Slope, Overhang, Roof Thickness and Fascia Orientation (Normal). Roof Slab Result: (Individual Roof Slabs) Figure 6 Roof Object Adding A Roof Slab Roof slabs can be added into a design individually. When placing a roof slab, there are two different Modes to select from: Projected and Direct. A roof slab created in a Projected Mode allows certain properties to be set prior to adding the slab into the design. Also, default properties can be saved in Roof Slab Styles. A roof slab created with in a Direct Mode will create a flat roof slab that can be modified after it has been added into a design. In addition, properties labeled in Blue indicate that the property has the same value saved as the style-based default. Properties labeled in Red indicate that the property has a different value than that saved in the style. If a value does not have an active stylebased default, then the text is colored the current Window Text Color; usually this is Black. See Figure 7. Also, the first point that is selected determines the roof slab s Pivot 9

10 Point. This is the point from which the roof slab will pivot. The second point selected will determine the Baseline of the roof slab. The edge of the slab along its Baseline is considered the roof slab s Baseline Edge. All other edges are considered Perimeter Edges. See Figure 8. Figure 7 Figure 8 A. Roof Thickness B. Vertical Offset Pivot Point C. Horizontal Offset Baseline D. Slope Baseline Edge E. Justification * (Base Height For Slabs Placed In Direct Mode) Projected Slab Perimeter Edges Direct Slab Lab: Adding A Roof Slab: Click on the Roof Slab Add layout tab. Make the lower viewport active. From the Design menu choose Roofs Add Roof Slab. Set the properties as shown in Figure 9. Click on exterior walls of the Lanai at the corners starting with Pt 1, Pt 2, Pt3, and Pt 4. (See Figure 9 for location points. The style is: 6in Lanai w Perimeter Edges.) After clicking Pt 4, click the Polyline Close button in the Add Slab dialogue box Click the Close button exit dialogue. Pt 1 Pt 4 Pt 2 Pt 3 Note: When Adding a roof slab, after selecting the first two points, the Ortho Close button will become enabled. If this button is selected, a square roof slab is created. The slab s Perimeter Edges will be determined by which Direction arrow is selected. Depending on which arrow is selected, the roof slab will either be created in a clockwise or counterclockwise direction. Figure 9 10

11 Modifying Roof Slab Properties Roof slab properties can be modified in many different ways. Let s explore the two most significant methods of accessing the properties. By right clicking a roof slab both methods can be accessed: Roof Slab Properties and Roof Slab Modify. Lab: Modifying Roof Slab Properties - Location: The lanai s roof slab is not at the correct elevation. If not still on the Roof Slab Add layout tab, select it and make the lower viewport active. Right Click The Lanai Roof Slab Roof Slab Properties Click The Location Tab. Set the Z Insertion Point to See Figure 10a. The roof slab is now bearing on the walls at the correct elevation. See Figure 10b. Figure 10a Lab: Modifying Roof Slab Properties Slab Edges: Edge 3 does not have the desired overhang: it needs to set to 0. Right Click The Lanai Roof Slab Roof Slab Properties Click The Edges Tab Set Figure 10b Edge 3 s Overhang to 0. Also, Edge 3 s Edge Style needs to be set to None to clear the fascia and soffit conditions that are coplanar to the main house. See Figure 11. Edge Orientation Square Plumb Edge 4 Edge 1 Baseline Edge 3 Angle Edge 2 Figure 11 Note: If multiple roof slabs are selected, the Edges tab in the Roof Slab Properties dialogue box will not be displayed. 11

12 Figure 12 Roof Properties Match A roof slab can also be modified through the Modify Roof Slab dialogue box, which can be accessed by Right Clicking A Roof Slab Roof Slab Modify. A roof slab s Style, Slope, Thickness and Pivot Point can be modified from this dialogue box. The Match (Properties) icon (see Figure 12) allows one slab to inherit the properties of a selected slab. The Properties icon (see Figure 12) will call the Roof Slab Properties dialogue box (as shown in Figure 11). Right Click The Lanai Roof Slab and set the Rise to 4. See Figure 12. Click OK To Exit Dialogue Box. Slab Tools The power behind roof slabs is their flexibility to be modified through the Roof Slab Tools set. Roof slabs tools can be accessed by Right Clicking A Roof Slab Tools. Individual roof slabs can be customized by: Trimming, Extending, Mitering, Cutting, Adding/Removing Vertices, Adding/Removing Holes, performing Boolean operations on them and even adding custom Dormers. However, the Dormer command is only accessible from the Design pull down menu: (Design menu choose Roof Slab Tools Roof Dormer.) See Figure 13. Right Clicking A Roof Slab From The Design Menu The previous Lab produced the following condition at the lanai s roof slab edge and the main house. The roof s edge needs to be extended to meet the face of the wall. See Figure 14. Figure 13 Figure 14 12

13 Lab: Roof Slab Tools Extend: Click on the Roof Slab Extend layout tab. Make the lower viewport active. Then, Right Click The Lanai Roof Slab Tools Extend. When prompted, select the wall of the main house to extend the roof slab to. See Point 1 in Figure 15. Since it is sometimes necessary to modify more than one edge when extending a slab, the Edges that are to be lengthened are selected and not the edge to be moved. Therefore, Select The First And Second Edges To Be Extended As Designated By Points 2 And 3 In Figure 15. Now, Select The Four Lanai Walls Right Click Model Tools Roof Line Type a To Auto Project The Walls Select The Lanai Roof Slab Hit Enter Twice To Complete Command. Point 3 Point 2 Result Figure 15 Point 1 Note: The Roof Slab Trim command works similarly to the Roof Slab Extend command. Mitering A Roof Slab The Miter command provides mitering for two different conditions: Intersection and Edge. When mitering by Intersection, the two slabs must intersect at some point. The roof slabs are then trimmed along their perimeter lines. Vertices are added or removed as required. The new edges of the roof slabs are created with angles that create a true mitered cut. If the roof slabs each have a different thickness, then the new edges will have different angles. See Figure 16. Figure 16 Miter By Intersection Miter By Edge Miter With Different Edge Angles Due To Varying Roof Slab Thickness 13

14 If the two edges of the roof slabs do not intersect, use Miter by Edges. Miter by Edges provides more control over how roof slabs are mitered than Miter By Intersection because specific edges are selected to miter. Even the edges of overlapping slabs can be mitered without trimming the entire slab. However, new vertices may need to be added to create the desired geometry. Lab: Roof Slab Tools Miter: Click on the Roof Slab Miter layout tab. Make the lower viewport active. We will first change the slope of the roof slabs over the main house to provide something to Miter. Select all of the roof slabs of the main house. (It is may be easiest to select roof slabs by their Baseline Edges.) Right Click Roof Slab Modify Change The Rise to 12. Hit OK to Exit Dialogue Box. To begin mitering By Edge: Right Click Slab S1 Tools Miter. Type e for Edges Select Edge E1 Select Edge E2. Continue Mitering Slab Edges E3 To E4, E5 To E6, E7 To E8, E9 To E10, E11 To E12 And E13 To E14. The result of mitering is shown in Figure 17b. However, note the Edge condition of roof slabs S3 and S4 circled in red in Figure 17b. We will need to perform a Miter By Intersection to clean up these edges. Right Click Slab S3 Tools Miter. Type i for Intersection Select Slab S3 At The Bottom Near The Circular Entry (Designating The Side To Keep) Select Slab S4 At The Bottom Near The Circular Entry (Designating The Side To Keep). The result of mitering is shown in Figure 17c. S1 S6 E5 E3 E6 E4 E1 E2 E7 E8 E9 E10 S3 S2 Result S3 E11 E12 E13 E14 S4 S4 Figure 17a S5 Figure 17b Result Figure 17c 14

15 Cutting A Roof Slab Roof slabs can be Cut into two or more slabs using any 3D object or polylines. If a 3D body is used, such as a wall, any slab type or mass element, the slab is broken along the intersection lines of the surfaces. If a polyline is used, it s projected intersection to the roof slab is used. A roof slab Cut works best when the cutting body or closed polylines intersects any Perimeter Edge of a roof slab. Otherwise, a hole is created leaving the resulting new roof slab difficult to manage. For example, using a closed circular polyline to create a hole using the Cut command in the middle of a roof slab will result in a new circular roof slab that may not display its pivot point. If an opened polyine is used, the slab is cut along it s projection to the roof slab s perimeter surface. Note: When using circular cutting bodies or polylines, the smoothness (tessellation) of the cut is controlled by the Facet Deviation setting. The variable FACETDEV (formerly AECFACETDEV) sets the number of facets to display on curved AEC objects. This variable needs to be set prior to cutting the roof slab. A lower setting.0625 (or 1/16 without the inch designation) will display more facets yielding smoother AEC objects. A higher number will yield less tessellated AEC objects but not tax the computer as much. Lab: Roof Slab Tools Cut: Click on the Roof Slab Cut layout tab. Make the lower viewport active. Right Click Slab S3 Tools Cut Select The Curved Entry Walls Hit Enter. Roof slab S3 has been Cut into two separate roof slabs. See Figure 18a. Delete The New Roof Slab. Repeat the Cut command on slab S4: Right Click Slab S4 Tools Cut Select The Curved Entry Walls Hit Enter. Delete The New Roof Slab. See Figure 18b. Note that if a 3D body such as a slab covers the entire cut area, no second roof slab will be created. Right Click Slab S1 Tools Cut Select One Of The Balconette Slabs Hit Enter. Repeat the Cut command selecting the last balconette slab. See Figure 18c. S1 S3 S4 New Roof Slab Created No Additional Result Roof Slab Created Figure18a Figure18b Figure18c 15

16 Adding And Removing Holes In A Roof Slab Roof slabs can have Holes added and subtracted from them. Similar to the Cut command holes can be added using 3D objects or polylines. However, the Add Hole command does not create a new roof slab. Instead, it creates new vertices and edges on the roof slab. If more than one object is selected to generate a hole, the first selected is used and the others are filtered out. Note that holes generated from a closed polyline, will be projected from the polylines to the roof slab using the current User Coordinate System (UCS). When holes are generated from objects that have an interior void, the command line prompts you to select whether the hole is to be created using the inside or outside surfaces. For example, creating a chimney from four wall objects allows you to choose whether the hole will be cut to the inside or outside of the wall faces. Keep in mind that the new faces created by adding a hole will be aligned to the surfaces of the cutting body and not necessarily parallel to each other. Lab: Roof Slab Tools Add Hole (Skylights): Click on the Roof Slab Hole Skylights layout tab. Make the lower viewport active. Notice three different entities ready to define holes: a closed polyline, a mass element and a solid object. Right Click The Lanai Roof Slab Tools Add Hole Select The Polyline Hit Enter Answer yes to erase layout geometry Hit Enter. A hole is created. Repeat the Add Hole command on the mass element and the solid object choosing Outside when prompted for the Hole location relative to cutting objects. See Figure 19a. Lab: Roof Slab Tools Remove Hole (Skylights): Right Click The Lanai Roof Slab Tools Remove Hole Select One Of The Holes. The hole is removed and the roof slab is healed. Type u for Undo. Finally, Type PS For Paper Space Turn On And Unfreeze Layers A-Glaz-Lanai- Skylight And A-Glaz-Lanai-Skylight-Curb. See Figure 19b. Figure 19a Figure 19b 16

17 Lab: Roof Slab Tools Add Hole (Chimney): Click on the Roof Slab Hole Chimney layout tab. Make the lower viewport active. Right Click The Roof Slab S1 Tools Add Hole Using A Crossing Selection, Select All Of The Entities That make Up The Chimney (All objects that do not comply will be filtered out. See Figure 20a) Hit Enter Answer no to erase layout geometry Hit Enter Answer Outside when prompted for Hole Location relative to cutting objects. A hole is created to the outside wall faces of the chimney. See Figure 20b to view roof slab geometry. S1 Crossing Selection Hole Created To Outside Of Wall Faces Figure 20a Figure 20b Roof Dormers The Dormer command is similar to the Add Hole command, except that it also trims the walls and roof slabs of the dormer. Selected objects are used to cut a hole in a roof slab creating a dormer; therefore, you must first create all parts of the dormer. Think of a dormer as being comparable to a small house whose walls and roof slabs intersect with the main roof that is receiving the dormer. Note that your dormer must contain a back wall so that the Dormer command can cut a full hole for the dormer. Lab: Roof Slab Tools Roof Dormer: Click on the Roof Slab Create Dormer layout tab. Make the lower viewport active. A closed polyline that will be used to define the eyebrow dormer s profile has already been created. Go To The Design Menu Roofs Convert To Roof Slab Select The Polyline Answer no To Erase Layout Geometry Type d For Creation Mode Being Direct Answer Bottom For Slab Justification When The Slab Properties Dialogue Box Opens, Select Standard As The Slab Type Click On The Dimensions Tab Make The Slab Thickness (This will be the slab s depth.) See Figure 21 for result. Figure 21 17

18 Click on the Roof Slab Dormer Assembly layout tab. Notice in the upper left viewport that four walls and a window have been added as the basic design of the dormer. Also, the walls still extend down to their baseline and up through the dormer. See Figure 22a. The walls need to extend up higher than the roof slab of the main house so that the Roof Figure 22a Figure 22b Dormer command detects trimming boundary faces. Make the upper left viewport active. Use A Crossing To Select The Four Dormer Walls Right Click Model Tools Roof Line Type a To Auto Project The Walls Select The Eyebrow Dormer Slab Hit Enter To Complete Command. See Figure 22b for result. Make the lower right viewport active. This dormer assembly is in the Y-Axis from it s correct location. Select The Entire Dormer Assembly And Move It Up In The Y-Direction Zoom In On The Dormer Assembly Mirror The Entire Dormer Assembly About The Diagonal Line Running Through The Entry. Create the dormer: Go To The Design Menu Roofs Slab Tools Roof Dormer Select Roof Slab S3 Select All Elements Of The Roof Dormer Assembly Hit Enter (objects that do not comply will be filtered out) Type y To Answer Yes For Slicing Wall With Roof Slab. A hole has been created and the walls, excluding the back wall, have been trimmed to the main roof slab. However, due to the complex curvilinear geometry, the roof slab has not been trimmed. We will address this momentarily in the next lab exercise. See Figure for 23a for result and 23b for the new overall roof slab geometry (from a front isometric view). Delete The Back Wall. Figure 23a Figure 23b Repeat The Roof Dormer Command On Slab S4 Then Delete The Back Wal. Change the Dormers to layer A-Roof- Dormer. See Figure 24 for final result. Figure 24 S4 S3 18

19 Adding And Removing Objects From A Slab (Boolean) Roof slabs often require additional 3D geometry such as curbs, rib joists and cornice returns that cannot be defined by the perimeter style, edge or profiles. Roof slabs may also require the subtraction of some portion of their geometry that the Trim, Extend or Miter commands cannot accomplish. The Boolean (Add) command fuses 3D geometry of selected objects with the roof slab so that a Section Cut through the roof slab will display it as a single outline. The additional objects are not affected and usually placed on a frozen layer. Similarly, the Boolean (Subtract) command removes geometry from the roof slab that the selected objects cover. The subtracted objects are also not affected and usually placed on a frozen layer. If the 3D bodies used in the Boolean process are moved, the roof slab geometry is updated accordingly. Lab: Roof Slab Tools Boolean (Subtractive): Click on the Roof Slab Boolean Subtractive layout tab. Notice in the lower left viewport that the dormer roof slab still passes through the main roof slab. The square object is a Mass Element that is aligned and coplanar to the main roof and fully covering the dormer roof slab. A similar condition exists for the other dormer and can be seen in the lower right viewport. See Figure 25. Figure 25 Make the lower right viewport active. Select The Dormer Roof Slab On The Left And Right Click Tools Boolean Select The Mass Element That Covers The Roof Slab Hit Enter Type s To Indicate A Subtractive Boolean Operation Hit Enter To Complete The Command. Notice in the lower left viewport that the portion of the slab covered by the mass element has been subtracted. Repeat The Boolean Command On The Other Dormer Roof Slab. Finally, Freeze Layer A-Wall-Boolean In The Current Viewport And Turn On Layer A-Roof-Slab In The Current Viewport. See Figure 26 for dormer roof slab geometry. Figure 26 19

20 Lab: Roof Slab Tools Boolean (Additive): We will add curbs to the lanai roof slab to support the skylights. These curbs will become part of the profile of the roof slab so that when a section is cut, a single outline will be displayed. Click on the Roof Slab Boolean Additive layout tab. Make the lower left viewport active. Make it a Hidden View if desired. Right Click The Lanai Roof Slab Tools Boolean Select The Three Skylight Curbs Using A Crossing Selection Hit Enter Type a To Indicate An Additive Boolean Operation Hit Enter To Complete The Command. Finally, Freeze Layer A-Glaz-Skylight-Curb. Notice in the upper left and lower right viewport that the roof slab geometry now incorporates the curb geometry. (The curb becomes the color of the roof slab.) See Figure 27. (This is different than Figure 19b where the curb is still a separate object displayed in purple.) Figure 27 Adding And Removing A Vertex In A Roof Slab Roof slabs can have verities added and subtracted from them. By adding a vertex, second roof slab edge is created from one. Lab: Roof Slab Tools Add Vertex: Click on the Roof Slab Vertex layout tab. Make the lower left viewport active. Right Click The Lanai Roof Slab Tools Add Vertex Select Edge Above Point Pt 1 (As Shown In Figure 28a) Select The New Vertex And Drag It Up 5-0 And Left Click Repeat Add Vertex And Add A Vertex At Edge Above Point Pt 2 Select The New Vertex And Drag It Down 5-0 And Left Click. See Figure 28b for result. Pt 1 Pt 2 Result Figure 28a Figure 28b Lab: Roof Slab Tools Remove Vertex: To remove a vertex: Right Click The Lanai Roof Slab Tools Remove Vertex Select new Vertex Repeat For Other Vertex. 20

21 Finishing The Main House (Time Permitting) Let s put a conical roof over the entrance. Lab: Conical Roof: Click on the Time Permitting Finish main House layout tab. Step 1: Covert The Circular Polyline To A Roof Object: Convert To Roof (Experiment with the settings in Figures 29a and 29b.) Figure 29a Figure 29b Let s put roofs over the bays. Lab: Bay Roofs: If still not current, click on the Time Permitting Finish main House layout tab. Step 1: Covert The Bay Walls To A Roof Object: Convert To Roof And Make Plate Height 22-0 and a 6/12 Slope. (Tip: select each bay individually. In fact, due to geometry below, it may be easier to temporarily move the bay walls out of the way to work on them prior to Converting To Roof to avoid undesired roof geometry from resulting.) Figure 29c 21

22 Step 2: Grip Edit: Grip Edit Back Hip Point And Drag Past Back Roof Edge. See Figure 29c. Step 3: Grip Edit: Convert To Roof Slabs. (Move any moved geometry back into place.) Step 4: Roof Dormer: Roof Dormer. Fix or delete any unneeded created geometry. Edit the front three bay walls Floor Line vertices by bringing them back down to a zero Vertical Offset from the Baseline. Delete Back Wall. Step 5: Repeat Roof Dormer On Other Bay: Roof Dormer. Fix or delete any unneeded created geometry. Edit the front three bay walls Floor Line vertices by bringing them back down to a zero Vertical Offset from the Baseline. Delete Back Wall. Step 6: Add Edge Styles: Add An Edge Style To Roof Edges. Figure 29d 22