AutoCAD 2014 3D Modeling
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You can also return to any previous view by using the Zoom Previous command option, Z P at the keyboard or from the Standard toolbar. When you have selected the objects, the Change Properties dialogue box appears. To change the thickness, simply enter a value in drawing units in the Thickness edit box. When you click the "OK" button your objects will be extruded by the amount specified. The illustration right shows the result of applying a thickness to a circle.
ENGT 220: AutoCAD 2014 Tutorial Second Level: 3D Modeling
A circle with no thickness is shown on the left and a circle with thickness on the right. Effectively a circle with thickness becomes a cylinder. By now you should be quite used to using the Move command but up until now you've only been moving 2D objects in the XY Plane. Move can just as easily be used to move a drawing object vertically, perpendicular to the XY Plane.
You can do this by using XY and Z co-ordinates or by picking points in 3D space. In the illustration on the left a circle has been moved from the base plane of a cube to the top face of a cube.
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Just start the MOVE command, select the circle, pick one of the lower corners of the cube as the base point use the end point Osnap! If you look at the circle in plan there appears to be no difference in it's position because it has not been moved in the XY plane but perpendicular to it. You can use the same principle to move any drawing entity. Bear in mind that you must always use an Osnap when you are picking points in 3D space. If you do not, the picked point will always be on the base plane, which doesn't make any sense.
One of the problems with this is that you may not realise your mistake until you change your view position because in the current view the objects will appear to have been moved normally. It's a good idea to keep switching your view point as a check. In the above example the move was fairly easy because we had a cube to use as a guide. Very often you will need to move an object vertically without any guide.
ENGT 220: AutoCAD 2014 Tutorial Second Level: 3D Modeling
In such a case you should use co-ordinates. For example, if the cube in the illustration above was 40 drawing units high then I could move the circle using the following command sequence. Base point or displacement: Notice that I use the UCS origin point as a base point, that's because it's standard practice but in principle it could be any point in space.
The most important thing is that the X and Y co-ordinates remain the same because we do not want to move in the XY Plane and the Z co-ordinate must increase by the distance you want to move up. Using co-ordinate 25,43,16 as the base point and 25,43,56 as the second point would have resulted in exactly the same move. To move down you just need to specify a negative Z co-ordinate.
For example to move the circle down by 40 units the second point co-ordinate would be 0,0, The 3D Face command is used to draw 3D surfaces with 3 or 4 edges.
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The reason is that when you give an entity like a rectangle a thickness it is given solid sides in the direction of the extrusion but it is left open ended like a tube. To add a top and a bottom to a box you must use 3D Faces. The box on the right is a rectangle which has been given a thickness. As you can see, it does not have a top. A 3D Face has been added to the top of the box on the left which gives the effect of a solid surface when shaded. When you use the Shade command, don't forget to use the Regen command to get back to the wireline drawing. AutoCAD does not allow you to pick points on a shaded drawing.
For complicated shapes you may need to use a number of 3D Faces to fill a surface. Fortunately, extruded circles are automatically given a solid top and bottom so you don't need any 3D Faces. If you do need to use a complex of faces to fill a surface there is a way to hide the join lines between faces.
If you type "I" and before the first pick point of any edge, that edge will be made invisible. If you are careful you can easily fill a complicated surface with many 3D Faces which will simply appear as a single continuous surface. The exercise below is designed so that you can practice all of the new commands and techniques outlined above.
It is a simple table which is composed of 9 main elements, 4 legs, 4 rails, and a top. Remember, there is nothing special about rectangles, they are just 4 sided closed polylines, so if you prefer using the PLINE command, then feel free. These rectangles will be given a thickness using the Properties command and an elevation using the MOVE command.
First of all draw the table plan using the dimensions on the illustration and inset detail below. All dimensions are in millimetres.
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