3d Help!?!?

[MikeScott]

When you subtract from multiple objects, the material that's left behind and has been selected as part of the solids to subtract FROM..has a tendency to join together as one object (even if they aren't touching).

 

The union command whenever it's used, will join items... that's it's sole function, to make multiple items become a single item.

[pbooth11]

  MikeScott said:

When you subtract from multiple objects, the material that's left behind and has been selected as part of the solids to subtract FROM..has a tendency to join together as one object (even if they aren't touching).

 

The union command whenever it's used, will join items... that's it's sole function, to make multiple items become a single item.

 

so ReMark told me wrong tut tut it works now lol.........so from here how would i create a window as to what i will be able to assign materials too it?

[ReMark]

Sure, go ahead and create that new window and add it to your building. That would be like putting a hat on a donkey. You're still going to try to look in the window and see inside but all that will show up is a solid block of ????? If that is the affect you're going for then be my guest. The result will be less than satisfactory.

 

What are you going to do if a cross-section through the building is required? Just curious.

[pbooth11]

  ReMark said:

Sure, go ahead and create that new window and add it to your building. That would be like putting a hat on a donkey. You're still going to try to look in the window and see inside but all that will show up is a solid block of ????? If that is the affect you're going for then be my guest. The result will be less than satisfactory.

 

What are you going to do if a cross-section through the building is required? Just curious.

 

i have no idea.....im just open to ideas of how to put my drawing right?? and i dont seem to be able to yet??

 

like you say it still creates on block i want to have seperate ones so when come to assign materials to walls, doors and windows i can pply them to the specific layers and the objects i want..................

[ReMark]

Use what you have then. Make a frame for your window (extruded aluminum?) and add some glass to it. Then pop it into the recess you've created in the wall for it. How's that approach sound?

[pbooth11]

  ReMark said:

Use what you have then. Make a frame for your window (extruded aluminum?) and add some glass to it. Then pop it into the recess you've created in the wall for it. How's that approach sound?

 

to be honest mate i have no idea hpw to approach this? would it better starting my building from scratch? and if so i still dont know how to do it so wen i subtract the window object from the walls i have 2 seperate objects and not 1 solid one.......

[ReMark]

You're not subtracting the window from the wall. All you are doing is creating an opening for the window frame to fit it.

[pbooth11]

so if im not subtracting what do i do? i need to create a hole for a window but i also need something there to assign 'glass' material too dont i?

 

the process i was taught at university was to create a rec, extrude it by x and SU it creating a opening for a window but put it on the coorect layer for a window?????

[ReMark]

It looks like some type of an industrial building to me. Right? The window glass will probably sit in some type of extruded aluminum frame right? Create that frame and the window glass and put it in the opening.

[pbooth11]

  ReMark said:

It looks like some type of an industrial building to me. Right? The window glass will probably sit in some type of extruded aluminum frame right? Create that frame and the window glass and put it in the opening.

 

its no specific building, my assignment required me to draw a 3d building using subtraction and union techniques.......hense y i had to use subtraction to create an opening for say a window but my prob was that instantly this became one solid object

[ReMark]

I'm sure you are smart enough to realize that a wall, a window frame and a sheet of glass are separate objects. All you did for your "window" is remove some part of the solid wall but you put nothing there for the window itself.

 

Look at the example below. There is a wall, a window frame recessed into the wall and a piece of glass in the frame. They are three distinctly separate objects each on its own layer (Wall, Window Frame and Glass). I can now asign materials to each of those layers rather than the objects themselves if I want to. The image below makes use of the Realistic Visual Style. No materials have been applied yet. The angle of view is slightly askew to show that the frame and the window glass are both recessed.

 

 

By the way...the window sits in a void I created in the wall. The opening for the window does not pass entirely through the wall. You could do the same thing with your building.

[ReMark]

The image below depicts a wall with an overhead door inset into a void created in the wall itself. Layers for the steel framing members (channel and angle) and for the door itself (OHD) were created. The Wall layer is the same as previously constructed.

 

 

Again, the image is shown in Realistic Visual Style (no materials assigned yet).

 

You could do this as well in your drawing. If the windows and the overhead doors you have in your building are the same size then you only have to make each one once and copy them where needed.

[ReMark]

Looking once again at your drawing were you going to add any regular doorways? All the openings, excluding those for the windows, look like they are for overhead doors. Were you going to add windows to the large rounded corner of the building?

 

One wall has no windows at all. Was that intentional?

 

Is the uppermost roof going to remain flat?

 

What materials were you thinking of using?

[MikeScott]

I think the source of confusion here with the window is that it's not a one-step process.

 

Step one - use subtract to create a hole.

Step two - put a solid in there to act as glass.

 

The main problem, as ReMark points out, is that your building is solid rather than hollow.

 

Essentially, you'd have a view into a solid block, rather than a view into a building.

 

Following ReMark's directions (with offset and subtract) is how you can quick-fix that "solidness" issue, you just have to choose the "larger" copy of the building as the first step in the subtract command.. you did it the other way when you got your error. Unfortunately, all the walls will still be unioned at that point, but at least it's hollow inside the building.

 

In terms of adding window frames and stuff, that's highly recommended, and approached the same way.. Subtract the hole for the window from the wall, and then create a series of solids to act as the frame for the glass and put it in there, then add the glass. (or glass first, then frame, either way.. but DONT union the glass to the frame, or the frame to the wall)

 

If you want a quick way to do this.. (assuming you have a wall of reasonable thickness, not a solid) Make a 3d box that's about 4 inches larger, than the glass opening area, and 4" thicker than the wall. Position it where the window will be. Then SUBTRACT the glass area from the center of it (making a very rundimentary frame, but no hole in the wall itself).

Then start the SUBTRACT command again and separately SUBTRACT the glass area from the wall itself. Then put in your glass.

 

If you subtracted from both the wall and the frame at the same time, the wall and the frame would become unioned together.

 

Doors.. same thing, though obviously at floor level rather than halfway up the wall, and choose a material for it that is "door-like" rather than glass.

 

Remark didn't give you bad advice at all. There's just a bit of a language thing sometimes when someone uses AutoCAD terms that aren't the same as "real words."

 

(ie- like "open a window" on your computer, versus "open a window" in your bedroom)

[ReMark]

I didn't use "real words"? No wonder why my wife doesn't understand a thing I say!

[ReMark]

pbooth11: How's it going? Have you made any progress?

[pbooth11]

  ReMark said:

pbooth11: How's it going? Have you made any progress?

 

Sorry all i have been busy will university......i will try the processes you have indicated to me and let you know how i get on

 

Thanks for all your help and advice i will b back to comment sooner rather than later haha

[pbooth11]

  ReMark said:

Your walls must have a thickness.

 

Draw a box (use the rectangle command). Offset it some distance. Invoke the Region command and select both boxes when prompted. Invoke the Subtract command and subtract the inner box from the outer box. Extrude the object. You should now have a box that you can 1) look into and 2) has "walls" equal to the distance you used as the offset. Try it now.

 

ReMark......still trying the region....subtract bit of this process doesnt work at all heeeelllllop

[ReMark]

Region first. Then use the subtract command just as you would for any solid (what are you subtracting from then what is being subtracted). Finish it all off by using the extrude command or press/pull. Done.

[pbooth11]

  ReMark said:

Region first. Then use the subtract command just as you would for any solid (what are you subtracting from then what is being subtracted). Finish it all off by using the extrude command or press/pull. Done.

 

iv tried that process but all i get is the same 'error' command n get the same 'trial box' that i posted previously