As many of you I do enjoy working with an “extrude along spline” tool.
It makes your modeling so much faster in some cases, and it has
flexibility to achieve various results fast. I found it very good when my
task is not very constrained, when I work with something that I can change and create at my will.
But Some time ago I needed to do something more precise. To be exact i had to
do some lines on a sphere surface. I did remembered nice tool we have in NURBs arsenal which is called “create cv  spline on surface”. Now that i had my splines on a surface i needed to use them as splines for extrusion in my model.  And then I had some troubles with extrude along spline tool.  It just doesn’t seem to actually follow given curve, or to be more precise, the result is same as the curve, but its orientation is all wrong.
And then I had to find how to fix it. So if any of you happen to have same problem
here are some screen shots with a problem and its solution.

 

object and the spline

object and the spline

 

Just a picture of an object and a curve.

extrusion

extrusion

 

 

 

 

 

 

 

 

 

 

 

 

So we select faces and go to extrude along spline, and we choose our spline.

 

aligning

aligning

“Align
Aligns the extrusion with the face normal, which, in most cases, makes it perpendicular to the extruded polygon(s). When turned off (the default), the extrusion is oriented the same as the spline. To Face Normal, the extrusion does not follow the original orientation of the spline  it’s reoriented to match the face normals, or averaged normals for contiguous selections. The Rotation option is available only when Align To Face Normal is on.”  description from 3dmax help file.

 

rotation

rotation

 

“Rotation
Sets the rotation of the extrusion. Available only when Align To Face Normal is on. Default=0. Range=-360 to 360.” again, from 3dmaxs help.

make it first

make it first

 

So here we

select the vertex which is closest to extruded polygon so we can make it “first”

wuala!

wuala!

 

 

 

 

 

 

 

 

 

 

 

So we have it. Now our extrusion actually follows given spline. This seems to solve my problem. Hoope it helps you too.

 

 

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