alice-teacher possible glitch in Alice 2.2 with magician

[Don Slater]

Sandy,
Thank you for this information. It is very helpful (and somewhat surprising!)

Later,
Don Slater


On Dec 10, 2013, at 10:11 PM, Sandy Graham <sandyg at gvtc.com> wrote:

> This just in from my student:
>  
> It’s not that normally messing with his arm caused it to glitch. It’s when I would undo having moved his arm that caused it to glitch. Just messing with his arm was fine, but If I moved his arm starting from the torso and then clicked undo, his arm would become invisible. I’m saying this because everyone's best explanation for fixing this is to press undo, but the more I press undo the worse it gets :P.
> 
> lol
> 
> ~XxRarityx17
>  
>  
> Your sister in Christ,
>  
> Sandy Graham
>  
>  
> From: aik min [mailto:aik_min at yahoo.com] 
> Sent: Thursday, December 05, 2013 10:12 PM
> To: Alice educators; sandyg at gvtc.com
> Cc: Don Slater; Wanda Dann
> Subject: Re: alice-teacher possible glitch in Alice 2.2 with magician
>  
> Sandy,
>  
> The problem is not with the code but with the magician. To simply put it, it is a matrix multiplication error that happened when you try to manipulate the object on a very small scale. Due to this error, certain points on the object is placed wrongly, and when reconstructing the model, it is not what it looks like before you moved it. As far as we know, this only happens to the magician and the rabbit model.
>  
> Anyways, if you get this error, please do not ignore and continue. Press undo until the model returns to its original look and try moving it again.
> 
> Thanks,
> Aik Min Choong
>  
>  
> On Dec 4, 2013, at 5:43 PM, Sandy Graham <sandyg at gvtc.com> wrote:
> 
> 
> One of my students is fairly artistic and was positioning the magician just so for exercise 7 in chapter 4 and discovered that the magician’s arm disappears when repositioning.  We played with it and programming does not cause problems, just manipulating the object in the scene set up.  Is this an error?
>  
>  
> Your sister in Christ,
>  
> Sandy Graham
>  
> <Messed up magician object.png>_______________________________________________
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