Re: Still stuck on this problem

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???? ????? "Robert" <watki...@hotmail.com> ?? ?????
???????:bbf597f9-66bd-46dd...@j8g2000yqd.googlegroups.com...
Well, I have been stuck on this for about two years.

I have tried everything I can think of and I still get the same
problem whether I use matrix or quaternion. In that however I try to
rotate an object within this context the rotation is always out which
then means I cannot process the vertices. To date all the ‘help’ I
have received has yielded nothing and I am kind of frustrated, with
this which is why I am reposting and really would appreciate some
advice.

Here is the problem :

I select say four vertices on a sphere that are say mid way up and
offset to the left, i.e. not centered.

I wish to process these vertices, to extrude or scale.

Therefore, I need to translate the vertices to the center and rotate.

I can translate to the center, but each and every attempt to rotate
these vertices for two years of trying has failed to rotate them
correctly, thus no processing can be carried out on them.

I have tried matrix and quaternion functionalities and all of them
fail.

I am rotating the object on the atanf value picked up on the top left
of the quad.

I am translating and rotating the vertices not translating and
rotating world view.

I have tried translating and rotating the world view and this seems
to be ok until I retransform and the vertex positions have not changed
in model space so the processing remains asymmetric.

So, where am I going wrong, does anyone know.

Could anyone g.a.s ?

Hope someone might.