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CAD Forums => CAD General => The Third Dimension => Topic started by: rktect3j on May 12, 2005, 01:27:03 PM

Title: Newbie at 3d so how do you start.
Post by: rktect3j on May 12, 2005, 01:27:03 PM
I just want to play around a bit.  I'd like to know the best way to make a one room single floor house with one window and one door.  What do I start out with for this?  Layers?  Extrusion of a what?  Do I have to reset my ucs?  Pretend I don't know squat diddly about 3d. Oh yeah I'd like to be able to do that section cut thingy with pretty good detail.
Title: Newbie at 3d so how do you start.
Post by: CADaver on May 12, 2005, 01:35:19 PM
layers layers layers layers... can't have too many layers.

commands to start with
VPOINT ROTATE
VIEW TOOLBAR
VIEWPORTS TOOLBAR
VIEW (save restore)
BOX
CYLINDER
UNION
SUBTRACT
SLICE
SOLIDEDIT
Title: Newbie at 3d so how do you start.
Post by: daron on May 12, 2005, 02:47:16 PM
How do you start?... A book.
Title: Newbie at 3d so how do you start.
Post by: rktect3j on May 12, 2005, 02:57:12 PM
Quote from: Daron
How do you start?... A book.

Actually I have the book.  I even took the course about ten years ago.  Forgot everything.  So after I look at the book what is the best way to do 3d.  Wireframe or solid objects?
Title: Newbie at 3d so how do you start.
Post by: daron on May 12, 2005, 03:23:30 PM
Let the debates begin. I say solid, unless of course, you just can't make it work, then add some meshes to it.

What's the nature of the 3d?

If it's architectural, get ADT or Revit.
Title: Newbie at 3d so how do you start.
Post by: rktect3j on May 12, 2005, 04:24:21 PM
Quote from: Daron
Let the debates begin. I say solid, unless of course, you just can't make it work, then add some meshes to it.

What's the nature of the 3d?

If it's architectural, get ADT or Revit.


I am just playing around and thought it would be fun to look at 3d again.  We do mostly residential so there is no real need but knowledge is always worth something.
Title: Newbie at 3d so how do you start.
Post by: daron on May 12, 2005, 04:37:27 PM
That's true. Check out intersection and subtract. Those can be the most flustering ones. You can get some pretty interesting intersections if you really dig deep.
Title: Newbie at 3d so how do you start.
Post by: rude dog on May 13, 2005, 03:02:29 PM
<Step 1>
I would say you would outline your floor plan with a pline (make sure all lines are joined together) and extrude this outline a given height.
Title: Newbie at 3d so how do you start.
Post by: t-bear on May 13, 2005, 03:49:35 PM
Simple 4 sided house.......
rectangle 36' x 24'.  offset for wall thickness (4"??? I'm no archie & it's been a looooong time).   Extrude both to 8".   Subtract the inside from the outside rect.  (hint: pick "subtract FROM", then "object to subtract"....it's kinda counter-intuitive.)  In the View toolbar pick a south-west iso view....you're now looking at the south-west corner.  change your ucs to front. draw a rectangle 3" x 7".  Move this from bottom midpoint of the rectangle to bottom mid of the front (south) wall.  Now extrude the rect -4".  Next subtract the door from the house.  That should get you started.....I got here at 6AM....I'm out-a here for the weekend!!!!!

Have a "goodie", gang.
Title: Newbie at 3d so how do you start.
Post by: daron on May 16, 2005, 09:34:17 AM
Quote
(hint: pick "subtract FROM", then "object to subtract"....it's kinda counter-intuitive.)
Remember back in R12 when it was the other way around. Man that was a kicker trying to reverse the brain logic on that one.

Don't forget, 3d0rbit has lots of goodies to play with, including preset angles, like south-west iso.
Title: Newbie at 3d so how do you start.
Post by: CADaver on May 16, 2005, 12:57:58 PM
Quote from: Daron
Quote
(hint: pick "subtract FROM", then "object to subtract"....it's kinda counter-intuitive.)
Remember back in R12 when it was the other way around. Man that was a kicker trying to reverse the brain logic on that one.
I guess one man's intuitive is another's counter-intuitive.  

It always seemed straight forward to me, 6-4=2,
starting thing MINUS what you don't need EQUALS remainder.

but again,
that's just me
Title: Newbie at 3d so how do you start.
Post by: daron on May 16, 2005, 03:39:03 PM
I don't have a problem either way. Heck, -4+6=2 as well. I don't care how they do it, but changing the order when you're used to doing it one way just screws with the brain waves to make the hands do differently, what you just learned them to do.
Title: Newbie at 3d so how do you start.
Post by: CADaver on May 16, 2005, 04:33:35 PM
As I recall in R12, it was the AME (Advanced Modeling Extension) that worked with "solids" after a type (non-Acis).  AME was an aftermarket add-on, that was not fully under the control of ADESK, though marketed by them as an extension to autocad.

R13 was the first with ACIS solids, and the order there was always as it is now.... and that was over 10 years ago.

BTW, strictly speaking, -4+6=2 is addition not subtraction, you're adding 6 to the starting number.  :wink:
Title: Newbie at 3d so how do you start.
Post by: daron on May 16, 2005, 04:45:26 PM
Sorry. You still reach 2, though, just in reverse, but your AME to acis makes sense. I'd forgotten about AME. It was just hard to make the change when it happened is all I'm trying to say.

You're trying to pick an argument and I'm done, because I'm going home. Good day sir.
Title: Re: Newbie at 3d so how do you start.
Post by: Big G on September 22, 2005, 06:24:43 AM
Draw your floor plan. Select all the lines and give them a thickness (floor to ceiling).

VERY BASIC 3D plan.

3DO will let u scroll around.

Title: Re: Newbie at 3d so how do you start.
Post by: t-bear on September 23, 2005, 08:33:51 AM
The only problem with that is putting windows and doors in your walls.  That gets very complicated ............
Title: Re: Newbie at 3d so how do you start.
Post by: cad-waulader on October 13, 2005, 07:45:14 PM
What system parameters are key to being able to handle large 3d files? 
My PC really balks using 512 MB RAM with large models.  Am leaning toward 2GB RAM.  3d really taxes the system. 


Title: Re: Newbie at 3d so how do you start.
Post by: glee on October 13, 2005, 07:57:22 PM
Been awhile since I did 3D in Autocad. 
Need lots of ram, lots of virtual ram but I think that's handled by XP nowadays.
Used solid models for the most part because it was easier to subtract stuff and then union other stuff together. 
I know I used 4 views at a time.  One for plan, side and front views and one for an iso or 3d view.  Used the UCS a lot (especially for funky odd angled stuff).  Oh, started on R12 and have not really unlearn that way of modeling.
I've been trying out Revit and it seems pretty cool except when it comes to certain kind of forms or roofs. I just bought a book to figure that one out.  Know how to get it done in autocad but not revit.  Some people think Revit is more intuitive but after autocad and max, I think the old way of doing things can actually trip you up in a new program. 
You can download a demo of Revit to play around with. 

It used to be fun in college and for the first few years working.  Then I didn't have to for a long time.  Nowadays I just stress out thinking about it and whether I should be switching from acad to revit.  You hear so many different views.....  Plus if I make the wrong decision, it's my own money I'm burning now.