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>> Chapter 21, specifying

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three-dimensional[br]coordinates.

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In this chapter,[br]we're going to work

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on understanding[br]3D drawing,

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working with the[br]3D coordinates,

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and working with the[br]elevation and thickness,

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creating a custom

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User Coordinate System[br]for 3D drawing.

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Before, we were[br]working always in

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the x and y space or axis.

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In this chapter, we[br]are adding z-axis.

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In this Figure 21.1,[br]as you can see,

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on the left image is

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a top view or floor[br]plan of a building,

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and the right view[br]is a perspective.

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Working in three-dimensional[br]environment.

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So either you can open[br]a template file as

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acad3D or you can change

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the workspace to[br]three-dimensional space.

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Here on AutoCAD,

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there is a workspace

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and next to the[br]Quick Access view.

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Drafting annotation,

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it means two-dimensional[br]drawing.

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Switch that one[br]to 3D modeling.

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You can see the panels

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and ribbons are changing.

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If you don't have[br]a workspace,

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you can find this[br]drop-down arrow

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and look for[br]the workspace.

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We are now in the[br]3D modeling space.

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Under view, you can

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see viewport toolbars

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and unsaved view,

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or you can see in[br]the isometric views;

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Southwest isometric,

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Southeast isometric,[br]Northeast isometric.

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Click on that one. We are

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on the Northeast[br]isometric.

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And even the view cube,

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you have a chance to[br]switch the views.

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In the 3D modeling,

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I'm going back[br]to Home tab,

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we have three types[br]of modeling; solid,

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surface, mesh,

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and we are planning[br]to work on the

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solid and mesh[br]in this class.

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Under Home, we have

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x and y and[br]additional z-axis.

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Now we are on the World[br]Coordinate System.

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For example, if I draw

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a box and change

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the visual style[br]conceptual,

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I'm going to change[br]the coordinate.

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Here under the tab, there

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is a coordinates panel.

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If I change the[br]coordinates to the front,

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can you see the[br]difference on

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the direction[br]of the x-axis,

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and y-axis, and z-axis?

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So that's how we

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are changing the[br]coordinates,

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and it's called User[br]Coordinate System.

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Switching to the right,[br]under Coordinates,

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I'm going to change the[br]coordinates to top.

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So top is like

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a World Coordinate[br]System for us now.

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So the origin is[br]changing every

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time. One more time.

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Front, you can[br]see the x, and y,

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and z-axis,[br]right, x and y,

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and z-axis, and left,

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top,

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and the bottom.

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So why do we need access

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to change the coordinates?

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The reason that[br]we need to change

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the coordinate[br]is, for example,

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if I'm planning to draw

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something on[br]the left view,

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from the Home tab[br]drawing panel circle.

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When I move my mouse,[br]on the left view,

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I have a chance to[br]draw that circle

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exactly on the left view.

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I'm going back to World[br]Coordinate System.

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I'm changing the[br]visual style

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to 2D wireframe and

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now we are going[br]to start working

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on Exercise[br]AB21-A DWG file.

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So from Canvas,[br]please download

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a File AB21-A and[br]open that file.

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And also from the book,

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you can see the[br]steps for drawing

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the

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3D coordinates,

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using 3D coordinates.

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So I'm going to[br]follow the steps

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from this book[br]on Page 664.

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On desktop, I[br]created ENT 135.

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So here I have my DWG[br]Bible book drawing.

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There's AB21-A here.

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I'm going to open[br]File AB21-A.

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It's an empty file.

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So I'm going to[br]save as this file

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back to Assignment

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21A-01.

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Steps using 3D[br]coordinates.

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Open File AB21-A DWG[br]from the Canvas site.

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This exercise, assume that

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you have a dynamic[br]input turn

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on set to the default[br]of relative coordinate.

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The drawing used

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a two-dimensional[br]environment.

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It looks like[br]three-dimension environment.

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So I'm going back[br]to two-dimension.

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Save it as AB21-1 in[br]your assignment folder.

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Choose a home type,

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drawing panel rectangular,

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and create a rectangle.

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Start a rectangle[br]comment at

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the specifying first[br]corner rectangle.

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Type 0,

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0, 19.

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Press "Enter".

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At the specified[br]other corner type

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39, 15, "Enter".

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This creates a[br]rectangle 39 units

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by 15 units wide.

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That is 19 units above[br]the x and y-plane.

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Notice that you omit

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the z-coordinate for[br]the second corner.

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Choose a home tab,

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modify panel,[br]copy to start.

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We're going to copy

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the rectangle two units

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above the original[br]rectangle.

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So select the rectangle,

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select object,[br]press "Enter",

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and type 0,

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0, 2, "Enter".

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Press "Enter" to get[br]out of the command.

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You have two[br]rectangles but

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because you are[br]looking from

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top, you see only one.

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So we are going to

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Home tab view panel

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3D navigation[br]dropdown list

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and choose Southeast[br]isometric.

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Now you can see[br]two rectangles.

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If object snap is[br]not turned on,

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click on the[br]"Object Snap".

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Remember object snap?

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Set the running object[br]snap to endpoint.

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I'm going to turn off[br]the rest of them.

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Start the line command[br]and check on here.

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We should be following[br]Figure 21.6.

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I'm in the Step 7,

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going back to our[br]figure drawing.

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Start Home tab line.

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From Point 1,

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pick endpoint at Point 1.

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So second point or[br]specifying next point,

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type pound, 0,

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0, 0, "Enter".

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Specifying next point, 1,

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0, 0, "Enter".

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Specifying next point, 0,

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0, 21, "Enter"[br]and "Enter".

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We need to copy[br]these three lines.

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Press "Enter".

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From the endpoint,

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type 38, 0, 0, "Enter".

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Means 38 units[br]to the right.

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I can just copy[br]those two legs all

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the way to the extraction,

0:12:34.335,0:12:37.905
to the y direction to[br]back of the table.

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So copy. Either I

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can just copy[br]from here to here

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or I could just add 15 for

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the coordinates[br]and it would

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copy the legs all[br]the way to the back.

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Actually, it's[br]a piano bench.

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To draw an open cover[br]for the piano bench,

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we need to start a[br]line again, line.

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Start at the[br]endpoint at Point 2.

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Here is a Point[br]2 from the book.

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And specifying next point,

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type 15 with the angle of

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90 and the angle

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of 45. Press "Enter".

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And turn on the[br]Ortho mode or F8.

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Make sure you go[br]straight all the

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way and type 39,

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is the same way of[br]drawing a line.

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And also, you[br]can all the way

0:14:03.900,0:14:06.060
down and close this door

0:14:06.060,0:14:10.120
by finishing with[br]the endpoint

0:14:10.120,0:14:14.535
of the left corner or[br]Point 3 from the book.

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The last line is going[br]to be the bracing.

0:14:24.200,0:14:27.930
This line. So you're

0:14:27.930,0:14:31.145
going to have to[br]start the line.

0:14:31.145,0:14:33.190
Starting point is[br]going to be Number

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4 to Number 3,

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or you can use coordinates

0:14:39.690,0:14:43.210
of 15 with the[br]angle of 20,

0:14:45.800,0:14:49.485
2 as a z-axis.

0:14:49.485,0:14:53.955
Press "Enter". As you see,

0:14:53.955,0:14:57.420
our drawing is in the[br]three-dimensional view.

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Don't forget to[br]save your file.