alice-teacher s Digest, Vol 27, Issue 1

[nancy hoorn]

Actually, these are the types of questions that are beneficial to many of
us who are not yet experienced alice teachers! (and only novice users!).
Thanks for posting the questions.
I am an math teacher and am intrigued by the transformation of matrices --
have some pre-calc standards that could be addressed and that would be
great!

On Fri, Oct 5, 2012 at 10:50 AM, Funk, Philip <P.Funk at snhu.edu> wrote:

> Hi Don (and Wanda),
>         Yes, that does help.  Thanks.
>         I will follow your advice and do more investigation of
> transformation of matrices in 3D graphics.
>         Just so I am on the right track, it appears that the "perspective"
> attribute of the pointOfView is not directly modifiable by the user but it
> is modified as a result of changing an object's orientation (roll, pitch,
> yaw) but not by changing an object's position or by changing the camera's
> position relative to the object.  Am I on the right track?
>         BTW, no rush on a response, and no need to post to the forum.
>  This is not an issue of any importance and probably not one of general
> interest - just something I would like to understand better.
>         Thanks for the help,
>                 Phil
>
> -----Original Message-----
> From: alice-teachers-bounces+p.funk=snhu.edu at lists.andrew.cmu.edu [mailto:
> alice-teachers-bounces+p.funk=snhu.edu at lists.andrew.cmu.edu] On Behalf Of
> alice-teachers-request at lists.andrew.cmu.edu
> Sent: Thursday, October 04, 2012 9:32 AM
> To: alice-teachers at lists.andrew.cmu.edu
> Subject: alice-teachers Digest, Vol 27, Issue 1
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> Today's Topics:
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>    1. Re:  Question about Point of View (Don Slater)
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 30 Sep 2012 09:13:08 -0700
> From: Don Slater <dslater at andrew.cmu.edu>
> Subject: Re: alice-teacher Question about Point of View
> To: Alice educators <alice-teachers at lists.andrew.cmu.edu>
> Message-ID: <E9C47834-A6F9-489B-968C-50BE29E59CEA at andrew.cmu.edu>
> Content-Type: text/plain; charset="windows-1252"
>
> It is true that their are two explicit components to an object, location
> and orientation. There is an implicit component as well, distance from
> camera, that allows a model to be viewed in perspective. As a model is
> moved closer to, or away from the camera, in a 3D environment, we would
> expect that object to appear to "grow" or to "shrink". This last value
> (which is 1 in your example) is used to help with the transformation of the
> 3D matrix which is used to internally represent the object.
>
> I hope this helps. If you want a more in-depth explanation, look for
> "transformation of matrices in 3D graphics".
>
> Hope this helps, and my thanks to Wanda Dann in helping me put together
> this explanation.
>
> Later,
> Don Salter
>
> On Sep 30, 2012, at 8:15 AM, "Funk, Philip" <P.Funk at snhu.edu> wrote:
>
> >                 Hi All,
> > Each object in an Alice world has a point of view comprised of two
> components: the object?s position in the world (left right, up down,
> forward back) and the object?s orientation (yaw, pitch, roll).  In
> addition, there is a seventh number as shown in the picture below.
> >                 <image001.png>
> >                 Does anyone know what the last number (1 in this
> example) means and how it is used?
> >                 Thanks,
> >                                 P. Funk
> >
> > Please consider the environment before printing this e-mail.
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> End of alice-teachers Digest, Vol 27, Issue 1
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-- 
Nancy J Hoorn
Online math expert
WAY program
Certified math teacher
Graduate Student Full Sail University
Education Media Design and Technology
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