alice-teacher Probably an easy question

Donald Slater dslater+ at andrew.cmu.edu
Tue Nov 15 12:29:29 EST 2016


This is interesting…

It turns out, what I also assumed was the front of the SpiderRobot’s head is oriented differently than the body of the spider robot. And it turns out, this has been true for a long time in Alice (I just tested a version of the robot from Alice 2.2, released in 2009)…

As often as this exercise and this model has been used, it is surprising that we have not caught this before this (at least, I do not remember it coming up before this)…

I have attached a screen shot to illustrate. The image has two spider robots, and two axes, i have set the point of view of the first axes to the entire spiderrobot on the left, and I have set the point of view to the second axes to the head of the spider robot on the right.

Thank you for pointing this out…

All the best,
Don Slater

Alice Project




> On Nov 15, 2016, at 11:35 AM, Roger Crowe via alice-teachers <alice-teachers at lists.andrew.cmu.edu> wrote:
> 
> I've taught this lesson before but now an Alice object seems to be acting differently. In Alien Encounter the spider robot's head, which I thought the red visor was actually the front of, when told to Turn to Face the wheeledrobot, points the back of his head (opposite the red visor) to the wheeledrobot.
> 
> If I ask the entire Spider robot to Turn to face the wheeled robot, the red visor and the body point to the wheeledrobot.
> 
> What am I missing here?
> 
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