alice-teacher Room/objects collisions

[Erik Ruud]

Roger,

Don's answer should work for walls.

Keep in mind that the collision detection is based on bounding boxes
that encompass the entire object.

We were working with a bunch of trees and the students were supposed
to prevent their characters from walking through the tree trunks but
we found that the collisions would occur at the outer perimeter of the
trees branches because of the bounding box.  We ended up putting
invisible cylinders inside the tree trunk and using those for the
collision detection.
Sincerely,

Erik Ruud

"Everyone is entitled to his own opinion, but not his own facts."
-Daniel Patrick Moynihan


On Fri, Mar 16, 2018 at 10:47 AM, Don Slater <don at alice.org> wrote:
> Roger,
> This is particularly difficult for the room as it does not have an easily
> ideifieablle sub-parts to detect when an object is about to collide with it.
>
> One solution might be to place different shapes with an opacity of 0 near
> each of the walls, and then use the CollisionStartListener to listen for
> when the moving object approaches these invisible objects.
>
> See the following links for more information:
> http://www.alice.org/resources/how-tos/setting-up-collision-detection/
> http://www.alice.org/resources/how-tos/setting-up-proximity-detection/
>
> Please let me know if you have any questions.
>
> All the best,
> Don Slater
>
> Alice Project
>
> On Mar 16, 2018, at 11:02 AM, Crowe, Roger <rcrowe at greenville.k12.sc.us>
> wrote:
>
> Hi,
>
> When using environments like class rooms in worlds and creating user
> interactive programs, what is the best way to prevent a user driving a
> character or camera through a wall.  Is there collision control?  Thanks for
> suggestions and if you can attach files that would be great.
>
> Thanks!
> Roger Crowe
> J L Mann HS
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