#3DS anomalies
4 messages in this thread
I previously inquired about unexpected lateral displacement when using
Modify/Vertex/Align. Here's the example that demonstrates this problem. I just
want to
understand the limitations of the program.
1. Create a simple box (100 unit on each side) on the X/Z plane in the 3d
editor. Use increment snap so that precision is assured.
2. Modify/Object/Move so that its center is located at (0,0,0).
3. In front or side view, use Modify/Vertex/Move (constrained to the Y axis)
and move each upper vertex to a different Y value.
4. With default construction planes axes at
(0,0,0), select these modified vertices and, in the top view, use
Modify/Vertex/Align (Selected) to align the vertices to a common Y value.
The result of my demonstration was that each vertex is shifted by 0.58 units
(+X,-Z). A significant error IMHO. I'll upload the resulting file (box.3ds) for
your analysis.
A. Jay Holland
>>Modify/Vertex/Align – lateral movement<<
I was able to reproduce your problem with even more dramatic results – a
displacement of 0.88 in the two axes perpendicular to the align operation.
I will pass this on to Autodesk staff for their review.
As a workaround, Modify/Vertex/2DScale to 1% several times along a single axis.
I use this all the time, and thus never noticed this other anomaly.
– DaveM
Hi Jay,
Thanks for the concise bug report. We will be passing this on to Autodesk's
Quality Assurance dept.
jonas[adesk]
I did your tests and this is definitely a bug. You don't even have to move the
vertices on the top face of the box. Create a normal box, then select the top
vertices then do a Modify/Vertex/Align in the top view and the vertices will be
aligned in the y construction plane but the x and z values will be incremented
by, in my case +0.17.
DaviD "Modify/Vertex/Align (…and skew a bit)" GouID