T317, Computer Aided Drafting, Braukmann, 2/21/02 Page 1
3D Surfaces
3DFACE Go around CW or CCW, (not like solid)
Will define a surface or series of adjacent surfaces.
Three or four points will define one 3D polygon face.
To hide the lines between the faces: 3DFACE, when it asks for the "first point" of the line you
want to make invisible, Type I <ret>, then specify the next point or location <ret>.
Repeat for subsequent points.
Quality First SETVAR <ret> then SURFTAB1 and SURFTAB2 to
set the number of divisions the area will be divided into.
RULESURF 2 lines define a surface; will be ruled from the first to the second.
Number of lines is set by Surftb1.When you select the lines, the end of each
line closest to the "snap point" will be where rule #1 is drawn.
TABSURF Choose two lines. The first will be the "starting line" and the
second will be the vector to be copied at intervals along that line.
The number of vectors will equal Surftb1.
EDGSURF 4 lines define a surface; will be ruled in both directions, & will hide other entities.
`The number of lines in each direction will be set by Sruftb1 & 2
REVSURF Like Revolve in Mac3D. Uses any line as an axis. Creates surface model.
Regions Creates a surface with multiple holes in it. Can be extruded.
Simply asks you to select objects. Should use polylines for the complex shapes.
Must be closed objects and not ones that cross over themselves like a figure 8.
Strategies 1) Draw 3D basic layout and construction lines on their own layer.
2) Look for lines that you can copy. Any two lines will give you enough for a new UCS.
Look for surfaces that you can copy. Don’t redo any if you don’t have to.
3) Make a hidden layer for the surfaces. Put them there as you make each one to get it out of
your selection area.
4) Use polylines ahead of time, where you will need them.
UCS User Coordinate System
WorldThe original. X is across, Y is to the top of the screen.
New
Zaxis At a new origin point with an option on direction of Z axis
You can draw from a viewpoint looking down an axis
(like drawing a circle around the axis of the fuselage of an airplane)
3point Three points define a plane. pick, origin, X direction, general Y direction
OBject
Face
View Aligns with the current VPOINT, (bring in a border!)
X/Y/Z Rotates the existing UCS around the specified axis.
Point the positive axis toward you and rotate CCW.
Move Slides it to a new location along the Z axis.
Orthographic Uses one of six presets.
Apply (?)
Previous, Restore, Save, Delete allow you to save & reuse them
Going to the UCS to draw: View > 3D Views > Plan View > Current UCS
In 3D the grids are not always what/where you think, snapped lines will be created only in UCS
