alice-teacher How to orient part of an object to another object

[Findley, Scott]

Don,
Still having issues with the axis. Here's a response from the student:

I want my lighthouse to point at the helicopter as seen by the light house's y axix (the green one) Currently, the point at is making the lighthouse point it's z or x axis (the red one) at the helicopter. How do I get the lighthouse's y axis to point at the helicopter regardless of where the helicopter is in the world?

Suggestions? Help? I've attached a copy of his Alice file.



Thanks,
Mr. Scott Findley 
sfindley at sd43.bc.ca
Gleneagle Secondary School http://gleneagle.org
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-----Original Message-----
From: alice-teachers-bounces+sfindley=sd43.bc.ca at lists.andrew.cmu.edu [mailto:alice-teachers-bounces+sfindley=sd43.bc.ca at lists.andrew.cmu.edu] On Behalf Of Don Slater
Sent: Thursday, November 24, 2011 6:16 AM
To: Alice educators
Subject: Re: alice-teacher How to orient part of an object to another object

You might take another object, perhaps something from the shapes gallery, put it at the tip of the lighthouse, set its "is showing" property to false, set its "vehicle" property to the lighthouse, and then the lighthouse movements can be based on the "as seen by" modifier referencing this invisible object.

Please let me know if you have any questions.

Later,
Don Slater

On Nov 23, 2011, at 5:08 PM, Findley, Scott wrote:

> I have a student who wants to have the lighthouse 'launch' itself at a helicopter off in the distance, yet when he "Point at" a helicopter on the horizon, yet the lighthouse uses it's centre axis/point instead of the tip/point (much like a missile). Any suggestions?
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