the SketchUp Version 5Student Workbook phần 2 pot

The Basics

23

NOTE: You can also change the number of segments while

selecting the chord points, or before you set the bulge. In these

cases, you also need to type “4s.”

The arc now has four segments.

14. Once you create another object or activate another

tool, you can no longer change the arc this way (the

4s method). But for another way to change the arc,

open its Entity Info window. Both the radius and

number of segments can be edited.

15. Change the segment number to 8, and enter a slightly

smaller radius (don’t forget the units symbol if

necessary).

16. The arc shrinks, resizing the rectangle below it as

well.

17. Now make the arc radius larger. (Note that even if

you are using architectural units, you can still enter a

decimal value: 2.5’ is the same as 2’-6”.)

This time the arc updates but does not affect the

rectangle (now a trapezoid) below it. This is because

an arc can be fit to the current edge below at a size

less than a semi-circle. But if the new radius will

make an arc greater than a semi-circle, the edge

below will update instead.

18. Erase the line between arc and rectangle, and erase

the face.

19. For the next arc, use the bottom edge of the cutout as

the chord, and set the arc upward (blue direction).

Note that it has four segments; this reflects the last

arc change you made (and does not take into account

the change you made via Entity Info.

the SketchUp Workbook Version 5

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20. Type 8s to make the arc rounder.

21. Like a circle, an arc can be broken down into

individual segments. Right-click the arc and select

Explode Curve.

22. Each segment is now a separate entity. Erase the top

four segments. . .

23. . . . and draw a line to connect the ends of the

remaining segments.

24. Now draw an arc that sticks out of the side face, and

close it with a line. Leave room on this face for

another, similar arc.

25. Draw the next arc at the same height (by hovering

over an endpoint of the first arc and dragging the

cursor to the right). To set the bulge, you can pick the

bulge point of the first arc.

26. Close this second arc with a line.

27. Push/Pull the first arc down to the bottom of the box.

Then right-click the second arc and select Convert

to Polygon.

The Basics

25

28. Push/Pull the second arc the same distance. Because

it is actually a polygon, the segmentation is visible.

You could use Entity Info to change the radius of the

arc faces on either end of the extrusions. But once

Push/Pull is used, you cannot change the

segmentation.

Freehand

Another self-explanatory tool name, Freehand is used to

create freehand sketches.

1. Start with a box like this.

2. Click Freehand, or select Draw / Freehand.

3. Draw an open curve by clicking and dragging the

mouse. Because the mouse button remains pressed,

inferences from other points are not displayed.

Like circles and arcs, this curve is approximated into

segments, though it is selected and manipulated as

one object. The lines are thick because they are not

edges of a face.

4. Orbit to the other side, and draw a closed freehand

curve. To make a curve closed, simply end it at its

start point. If you do it right, the lines will be thin,

indicating a face has been formed.

5. Push/Pull out the freehand face. Although the curve

is segmented, the curved face is smooth.

6. Undo and use Convert to Polygon to create a

faceted extrusion.

This smooth vs. faceted behavior works the same

way as for circles, arcs, and polygons.

7. Undo again, and use Explode Curve. Now the curve

is broken into separate segments. Verify this by

erasing individual segments.

8. Erase the rest of the curve to clear the face. Then

draw a similar closed curve, keeping the Shift key

pressed.