Aussie John

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Credit:-
I ripped this together in an unbelievably short time preparing for a class. I did so after reading through the related on-line UNSW FBE tutorials and used them as a running start. The links I supply to them are my acknowlegement of their worth and value to the net community in general and to those battling on in the various public/community educational systems.

Corrections/Requests:-
Please email Aussie John if you spot errors in this or with requests for expansion or development along whatever lines you think desirable.

Tutorial 1: Intro To Solid Primatives

Set Up Enviroment

VPOINT _| (alias is -VP ..to alter the view)
-1, -1, 1 _| (looking at the origin from the SW)

Make a Green, Magenta and Yellow layer. Set the Yellow layer current.

LA(YER) _|
Pick New then type ...
GREEN,MAGENTA,YELLOW
On the Green entry, pick the word "White" (under Color).
Pick the Green coloured square in Standard Colors
Pick OK
On the Magenta entry, pick the word "White" (under Color).
Pick the magenta (purple) coloured square in Standard Colors
Pick OK
On the Yellow entry, pick the word "White" (under Color).
Pick the yellow coloured square in Standard Colors
Pick OK
Pick Current (..to make the Yellow layer current)
Pick OK

Use Box To Make a Base Then Set SHADEMODE

The first solid we will use is a box to make a base surface for our "virtual" world

BOX _|
0, 0, 0 _|
L _|
400 _|
300 _|
-10 _| (..going down means the top is our x-y plane)

Lets look at our solids from now on.

SHADEMODE _|
G _| (Gouraud with no edges ..for rounded surfaces present.)

solids1.png 5.28kb (cf gif 6.8kb, bmp 82kb, jpg 19kb)

At the point where you reach this image you should only have the yellow (box) base the top of which is in the Wcs x-y plane.

Please use this image as a guide when shapes are placed without locating co-ordinates so you have a comparable outcome.

I will add a few more shapes and develop things a bit in Tutorial 2 so keep to the general plan (with the Mark I Eyeball if necessary) and save periodically as solids1.dwg

Put Shapes on Green Layer

Change to green layer and put a green box on the plane

-LA _|
S _|
GREEN _|
_|

BOX _|
100,100 _|
L _|
50 _|
110 _|
30 _|

Again but this time we will use the first box for placement.

BOX _|
Pick the bottom mid -point of the first box's left face.
L _|
100 _|
70 _|
50 _|

CYLINDER _|
140,200 _|
20 _|
60 _|

CONE _|
Pick a point on the surface to one side
40 _|
60_|

CONE _|
CEN _|
Pick the top center of the cylinder we made in the boxes.
QUA _|
Pick a quadrant point on the top of the cylinder.
20 _|

Put Shapes on Magenta Layer -Utilise Move and Copy

Change to mageta layer and put some cylinders and spheres down

-LA _|
S _|
MAGENTA _|
_|

CYLINDER _|
200,200 _|
10 _|
80 _|

SPHERE _|
CEN _|
Pick the center point at the top of the tall cylinder
30 _|

We now make two spheres with their center on the plane surface and move one of them up to "sit" on the surface. After we will make a sphere directly on top of the surface

SPHERE _|
Pick some where on the plane surface.
30 _|

C(OPY) _|
Pick carefully on the sphere just placed.
_| (to end selection)
Pick another point reasonably near the first.

M(OVE) _|
Pick carefully on the sphere just placed.
_| (to end selection)
0, 0, 30 _|
_| (to conclude)

Introduce .xy Filter to Specify Co-Ordinates

Now we will make a last sphere, placing it directly on the surface anywhere any using an .xy filter that accepts your pick as providing the x and y center position co-ordinates but prompts for the z center position co-ordinate.
Afterwards it is changed to the green layer.

SPHERE _|
.xy _|
Pick some where on the plane surface (the x and y co-ords).
30 _| (the z position co-ord)
30 _| (the spheres radius)

Alter Properties Using MATCHPROP Command.

For something different, lets change the last sphere made over to the green layer using the "painter" matchprop ("match properties") command.

MA(TCHPROP) _|
Pick carefully on one of the green boxes to become the source of the new properties (I call it dipping the brush into the paint pot of green layer properties)
Pick at about the visual center of the last magenta sphere made with the paint brush that has replaced the cursor.

If you have problems selecting what you want hit Escape a couple of times and try again or use UNDO to get back if necessary.

Practice Using SHADEMODE Command

This is an introductory session and selecting in 3D work is probably worth a tutorial on its own. However going between wire frame and shaded is important for visualising and selecting so we will practice it now.

SHADEMODE _| (SHADE is only for flat with edges)
G _| (for Gouraud with no edges ..used if rounded surfaces present)

Really there should not be any on-screen changes because we went into this shade mode as soon as we made the yellow box that was base of our little "virtual" world.

SHADEMODE _|
2D _| (for 2D wire frame) _|

I'm tired of typing "shademode" so slap your Spacebar with your off-hand or right-click the mouse (the normal ways to "Enter" in AutoCad except when in the DTEXT or MTEXT command).

_| (.. to bring up the last command)
G _|

Final Save

Save your drawing as solids1.dwg

o0o