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# 3d studio max lathe object

Posted on 2002-05-28
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hello!!! question!
how come after lathing an object then applying a boolean subtraction operator, the resulting object has is not solid? i mean there is nothing in the center? on the the skin is left?...imagine a sphere.  then slice the sphere.  there you find nothing...how come? i clicked on weld center but still there is no center in my lathe object.  any insights please?  thanks to everyone in advance!
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Expert Comment

ID: 7071944
Make sure cap top and bottom are selected...  And try hitting the flip normals button in the lathe rollout (I'm assuming you're dealing with 3D Studio Max).  And also try converting a lathed object to editable mesh before performing a boolean on it.  If objects are too parametric it has a hard time calculating where the absolute mesh is.  And in addition, sometimes boolean cuts render unpredictable results, sometimes not filling areas, and sometimes creating a lot of spikes all over the place.
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Accepted Solution

ID: 7077803
vaX is right, but I don't think that's the problem you are having.

I think your problem may well be that you are not lathing the right sort of shape.  If you were modelling say a fish and chip cone, make sure the shape you lathe has thickness! - what I mean is that instead of lathing a straight line like so..

\           makes :           /\
\                           /  \
\                         /    \

this will only have normals facing outwards (thus you only see it when looking at the outside

model:

__                           _____
_ \       makes:            / ___ \
\ \                       / /   \ \
\_\                     /_/     \_\

after lathing this - I guarantee you will an object you can
view from all angles.

If this is not what you meant - and you are modelling something using a line like the first diagram, then make sure the material you apply to the shape is double-sided. The final object will have no thickness though - which can look a bit odd - so I recommend the second method.
Another important thing with lathing is that the line or shape you lathe doesn't cross over itself when you do the lathe - or you will get a similar problem.  To ensure this doesn't happen, apply your lathe - and then click on sub-objects (in the lathe modifier panel), and then pivot/axis (or something like that - I'm not in front of it at the moment) and move that - this will affect where the axis for the lathe is and you should make sure it is at it's maximum setting.

Also, your comment about the sphere - the reason is that an object is only _really_ solid if you tell it to be.  If you want to slice a sphere - then use the boolean modifier - which will treat the sphere as a real _solid_ object - and you should get the results you expect.   You can actually animate this effect to.

Another plugin which may be useful is a cut-away object. This will allow you to sweep a shape over another and cut-away part of the original model (i.e. like a cut away of a building) - this again uses the boolean principle and produces a nice effect.

Hope that helps.

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