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RCrussellUK

Add Surface

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Hello all,

Happy New Year!

I'm creating some relatively complex geometry using a lot of intersecting curves and blocks but seem to be achieving this in a rather hit and miss way. In pursuit of good practice I'd like to get a firm grasp of (what I'm sure are fairly simple) modelling principles.

The attached file shows the type of thing I'm doing, I need to combine these 3 shapes to create a single extrudable surface. I find it simple to use some arcs, rectangles, circles etc and simple add surface to amalgamate them all. Yet occasionally I have problems joining surfaces, especially when I use a concave arc.

Messing about with decompose/compose and switching solid off and on I'm managing to fudge solutions as I go along. This object I push/pulled the three surfaces separately and then added solids to get what I needed. I'm sure there's some simple way to do this that an experienced user would intuitively know.

Thanks.

Edited by RCrussellUK

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The reason these aren't adding together is because the middle object is a 3D Polygon, which is technically flat in this case, but it is still considered by Vectorworks to be a 3D object.

You will want to use all 2D geometry to create a flat profile. You can either draw them originally with the (normal)Polygon or other 2D tools, or select the 3D polygon and use Modify > Convert > Convert to Polygons on it.

Also, make sure all objects you intend to add surfaces on have a solid fill. The center object had a fill of None.

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I could have sworn I drew that middle object as a rectangle + arc. Does it convert to a 3D polygon as part of the add surface operation?

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An easy way to remember:

Add and Clip Surface are 2D operations - you'll usually end up with a polygonal shape. 2D stuff typically STAYS 2D stuff...

Add and Subtract Solids are 3D operations - you'll usually end up with a Solid Addition/Subtraction.

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Another quick one. I draw a shape using a working plane on an angled surface then need to extrude it at 90 degrees to the layer plane rather than the working plane it's drawn upon. There must be a button somewhere to switch the plane the extrusion extrudes from? Is it the second one on the Push/Pull toolbar, but this only seems to work when extruding 3D surfaces not a 2D surface drawn on the surface of a 3D object?

Edited by RCrussellUK

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An easy way to remember:

Add and Clip Surface are 2D operations - you'll usually end up with a polygonal shape. 2D stuff typically STAYS 2D stuff...

Add and Subtract Solids are 3D operations - you'll usually end up with a Solid Addition/Subtraction.

Thanks Wes, I think I'm still getting confused at some point about which is which (in terms of drawing 2D shapes with 3D settings) will refine this.

On the subject, I seem to remember there is someway to trim away the sub-object info which records the addition/subtraction information for 3D objects. Is this the 'convert to generic solid' option?

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Apologies for my simple questions, I think this stuff may seem fairly obvious to an experienced VW user, but I'm coming from SketchUp where all this sort of push/pull stuff was straight forwards.

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Yes, Convert to Generic Solids does remove the object's history and combines any contained geometry as well.

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No need to apologize, these discussions help you as well as other users as well as make it more clear to us where we need to focus our documentation/training/etc.

Please, keep asking!!!

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