Oblique view (Plan oblique 45 degrees)

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 From:  rado
3845.1 
Is there a good way to set a 3d view so that I can quickly export objects in 3d space to look like they were drawn in different styles?

For example, I want to do drawings of some weird objects as plan obliques at 45 degree rotation. I would also be interested in 30 / 60 plan oblique drawings.

I think that I need to change the 3d view option to parallel, but is there a way to adjust the angle to be correct in the 3d viewport so that I can export a known view to a different program?

I attached an example of the view that I'm trying to get from a book...

Forgive the terrible image, I only have access to mspaint at work =)

Thanks for the help in advance. This forum is really really helpful!!!!

Rado



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 From:  Michael Gibson
3845.2 In reply to 3845.1 
Hi rado, see this previous post for some scripts you can set on a keyboard shortcut to make an isometric or dimetric view:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1917.35

Also if you want to experiment with different angles of your choosing, the settings you can tweak for that are under Options > View. Set the "3D view projection" to be Parallel, and then push the "3D view angles" button to get a dialog that will allow you to enter in specific angles for the view direction:



- Michael

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 From:  rado
3845.3 
Hmm... interesting. I thought I got the result I wanted but I realize now that I probably need to figure out how to script something to give the view that I want.

For this drawing type (the plan oblique) the plan stays true and measurable (In paper space). I drew up a sample image to clarify what it is I'm after...

If I were doing this by hand, I'd take a plan, rotate it 45 degrees and project every elevation line up from the important points (keeping the vertical elevation data also measurable). In this example I drew a small room with a ceiling height of 8 feet. (To clarify, the final image drawn in that row was done in 2D using the described plan oblique method)

I'm trying to find a way to take a snapshot of vastly more complex stuff that I've already drawn in MOI so that I can quickly generate drawings in this style (I was thinking I'd take it into illustrator for lineweight etc).

The 2nd image is with me setting the 3d view angle to 45 degrees with parallel projection. It squats the elevation down and doesn't keep the plan true.

Is there anything that anyone can think of that would help me achieve this result? Any other program, tip, trick, etc?

Thanks!






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 From:  BurrMan
3845.4 In reply to 3845.3 
Pretty sure this works... Here, I just used extrude on my curves in the plan view, and "set dir" for the angle desired... I DID do some work to color lines to get the hidden lines effect...




I also fooled around with setting a CPlane at the angle I wanted, then used the edit frame to hit the "flat" option in one of the ortho views to "freeze" the 3d model..

EDITED: 19 Jun 2012 by BURRMAN

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 From:  Michael Gibson
3845.5 In reply to 3845.3 
Hi Rado, the parallel viewport in MoI will use what is called an orthographic projection, but it seems that the kind of thing that you want does not fit under the category of orthographic projections.

I'm not sure if you will be able to find a CAD program that would automatically generate that kind of projection that you are looking for, since I think it will produce a lot of distortion in any curved pieces.

I think that usually drawings like that are done with 2D drawing tools only, rather than taking 3D model data as input.

- Michael
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 From:  Michael Gibson
3845.6 In reply to 3845.3 
Burr's solution would probably be your best bet (good call Burr!) - if you generate your model with the right kind of distortion built into it (or squish it to produce the wanted distortion), then that's probably the only way that you'll get that kind of a result, probably in any CAD program.

You won't really be able to build the model in its true 3D proportions and then try to just take a snapshot of it.

- Michael
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 From:  rado
3845.7 In reply to 3845.4 
Burr,

That looks pretty good. Could you be more specific, I'm pretty basic with this program and didn't really follow your steps. Like a step by step? =)

Edit: NM I see what you did... So it looks like I would have to rebuild stuff with this in mind.

Would this work with a bunch or existing geometry or would I have rebuild existing complex objects with this projection in mind?

Thanks!

Michael,

I see... yeah I had a feeling that might be the case =(!

Could you maybe elaborate as to how I would go about squishing it to make it look right? I can't seem to wrap my head around this...

EDITED: 4 Nov 2010 by RADO

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 From:  Michael Gibson
3845.8 In reply to 3845.7 
Hi Rado,

> Could you maybe elaborate as to how I would go about
> squishing it to make it look right? I can't seem to wrap
> my head around this...

Well, I guess you want to apply a kind of shearing effect. MoI does not have an actual "Shear" command, but Rhino does so you could use Rhino to help out with this. You would apply the Shear command in Rhino twice since it shears in 1 direction at a time, so you would do it something like once in the front view and once in the side view to turn something like a cube into a slanted shape that still had the top and bottom faces parallel.

If your model is built up of simple extrusions, then you can apply that kind of shearing in MoI by some control point manipulation.

To do that, first break the model into individual surfaces using the Edit > Separate command.

Then select just the "side wall pieces" by going to the front view and doing a window selection starting from the right and going towards the left to do a "crossing selection" which will select anything that touches the selection window. Then turn on control points with Edit > Show pts. That should look like this:



Then you want to clear the selection and then select just the top face and the top set of control points of the side pieces, that looks like this:



Then you want to move those over diagonally to produce a slanted shape like this:



Then you'll take your snapshot from the Top view:




To produce the side-wall lines of the particular 2D length that you want, use the Move command to move the top row of stuff - click anywhere in the top view for the base point for the move and for the target point of the move you can use polar coordinate notation to enter in a distance and angle for the target point. You enter in polar coordinates by typing in a number then the < sign, then the angle, so for example if you want to shift it by a distance of 5 at an angle of 45 degrees, type in 5<45 for the 2nd point in the Move command.

- Michael

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 From:  rado
3845.9 In reply to 3845.8 
Thanks. I'll give it a shot.
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