If I have thos vectors:

A = <10,10,10>
B = <5,5,5>


and I want to use trace() to trace a ray starting at A in direction to B, how do
I calculate de direction vector?

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Am 02.04.2010 12:08, schrieb MadKairon:
> If I have thos vectors:
>
> A =<10,10,10>
> B =<5,5,5>
>
>
> and I want to use trace() to trace a ray starting at A in direction to B, how do
> I calculate de direction vector?

#local Direction = (B-A);

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clipka <ano### [at] anonymousorg> wrote:

> #local Direction = (B-A);

A more general rule-of-thumb would be

#local Direction = (<...ending point...> - <...starting point...>)

in case MadKairon decided to start at B and end at A. But perhaps that's obvious
from your reply.  ;-)

Ken

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Am 02.04.2010 19:35, schrieb Kenneth:

>> #local Direction = (B-A);
>
> A more general rule-of-thumb would be
>
> #local Direction = (<...ending point...>  -<...starting point...>)
>
> in case MadKairon decided to start at B and end at A. But perhaps that's obvious
> from your reply.  ;-)

Not from my reply, but from his question :-P

But of course you're right, the general formula is... well, more general 
;-).

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