Chapter 1 Introduction to Three-Dimensional Modeling
17
Copyright Goodheart-Willcox Co., Inc.
snap mode refers to a spline and the point at which one curve ends and the next curve
begins. The point cloud object snap modes can be used when working with point clouds.
Point clouds are discussed in Chapter 15.
The 3D AutoSnap markers that appear when drawing can be displayed in a
different color than 2D AutoSnap markers. Set the color for 3D AutoSnap markers by
accessing the
Display
tab in the
Options
dialog box. Pick the
Colors…
button in the
Window Elements
area to access the
Drawing Window Colors
dialog box. Select the
desired context in the
Context:
list and then select a color for the
3d Autosnap marker
element in the
Interface element:
list.
Sample 3D Construction Sample 3D Construction
The example provided here illustrates how you can move from a layout sketch to
an exact 2D drawing with parametric constraints, then quickly extrude the object into
a 3D solid model. Techniques illustrated here are discussed throughout the book. The
object shown is the plastic housing for a 24/15-pin cable connector. The fi nal rendi-
tion of this object would include internal cutouts, rounded edges, and holes, but is not
shown in this example.
Creating a 2D Sketch
A 2D layout can be drawn quickly using the
Drafting & Annotation
workspace. In
doing so, you can create a quick sketch without close attention to exact dimensions
or you can use direct distance entry and polar tracking for accuracy. If appropriate,
constraints can then be used to apply accurate dimensions and geometric relation-
ships, such as perpendicularity and parallelism, to the object. See Figure 1-20A. In this
example, only half of the object is drawn, since it is symmetrical. Then the
MIRROR
command is used to complete the layout. See Figure 1-20B.
Converting to a Region
The object is still composed of just 2D lines. Therefore, it must be changed to an
object that can be converted into a solid model. The
REGION
command is used for this
purpose. After selecting this command, you are prompted to select objects. Be sure to
OPTIONS
Application Menu
Options
Type
OPTIONS
OP
Figure 1-19.
The 3D object snaps
can be set in the
Drafting Settings
dialog box.
REGION
Ribbon
Home
Draw
Region
Type
REGION
REG