Autodesk LIGHTSCAPE, Руководство пользователя

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Importing Geometry 5
58
Lightscape
To specify units of measurement:
1.
In the Import DXF dialog, select a unit from the
File Units list.
2.
If the units in the model do not represent whole
physical units, set a scaling factor. For example, if the
model has a scale of 1 unit to 500 meters, select
meters as the unit and 500 as the scale factor.
When you import the model, the size of your model
appears and you are prompted to confirm that it
makes sense. If it seems wrong, click Cancel, and
Import it again using the correct units.
If you are not sure of the size of the entire model, you
should check the size of a smaller area after you
import the model into Lightscape. For more infor-
mation, see “Measuring Distance” on page 54.
Translating Geometry: Capping
Capping controls how the system converts circles
and closed polylines with no width.
Enable Capping to close the top and the base of
objects that have thickness.
If the entities have no thickness, enable Capping to
convert them into surfaces—for example, enable
Capping to convert a circle into a disc. If Capping is
disabled, circles and closed polylines with no width
and no thickness are not imported.
Translating Geometry: Smoothing
Groups
Curved surfaces in Lightscape are represented by
polygonal facets. If Smoothing Groups is enabled,
Lightscape converts thick 2D polylines and 3D
polygon and polyface meshes to quadrilaterals in a
smoothing group. If facets are part of a smoothing
group, Lightscape can create a smooth curved
appearance between these facets when they are
displayed and rendered.
Lightscape automatically creates smoothing groups
for extruded arcs and circles, as well as for 3D poly-
gon meshes with a smooth surface type, regardless
of if the Smoothing Groups option is enabled or not.
Polygon imported with
capping disabled Polygon imported with
capping enabled
Circle in a DXF file Circle imported with
capping enabled