Re: A ToonTalk picture touching more than one thing

Sounds reasonable, although I haven't given it too much thought. The 
only thing I would worry about is that some programs do need to vacuum 
the T-W sensor to change the object they're touching.

Ken Kahn wrote:

>Hi all.
>
>For domains like eco modelling and physics the ToonTalk sensor "Touching 
>Who?" is frequently used. It has long been noted that it doesn't deal 
>well situations where a picture is touching more than one thing. Looking 
>at the code I was surprised to discover that solution had been 
>implemented about 5 years ago. The solution was buggy but easy to fix 
>(and fixed in 3.127). The idea is that when you vacuum off what is on 
>top of the Touching Who sensor you see the next thing that is touching.
>
>To test this I made a robot that made a sound when a rectangle touched a 
>ball and put it on the back the rectangle. I then arranged for the 
>rectangle to touch a ball among many other things. Depending upon luck 
>(actually the Z ordering of the objects involved) the sound occurred or 
>not. But when I added a robot on the back of the rectangle that did 
>nothing but vacuum off the top of the Touching Who sensor then the 
>picture shown on the sensor changed on every cycle and hence the sound 
>robot ran (but it might have to wait a few cycles to notice that it was 
>touching a ball).
>
>What is nice about this is that old programs should run the same as 
>before (assuming they don't vacuum off a touch who sensor -- a check of 
>the Playground Adventure games showed it still works as before and it is 
>probably the most sophisticated program using sensors of this sort. It 
>is only when a robot that vacuums off the top of the Touching Who sensor 
>does the new behaviour kick in.
>
>I admit this is a bit peculiar that you need to have this robot 
>vacuuming the Touching Who sensor to deal with multiple collisions but 
>it is the minimal change to ToonTalk to support multiple collisions. And 
>there is a story behind it that kids should be OK with.
>
>Comments?
>
>Best,
>
>-ken
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>Yahoo! Groups Links
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