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Article View: comp.lang.pascal.borland
Article #63

Re: 3d programming

#63
From: schumaker
Date: Thu, 15 Feb 1996 00:03
36 lines
1969 bytes
>> > > >Actually, you only need 2 points to define a plane: a point on the 
plane and
>> > > >a normal vector.
>> > >
>> > > Sorry to quibble, but...
>> > >
>> > >    A VECTOR IS NOT A POINT!!!!
>> > >
>> > > Now back to our regular program.
>> >
>> > Points are vectors.
>> > ^^^^^^^^^^^^^^^^^^
>> 
>> Sorry, but I must take offense here.  A point in Cartesian space has three
>> aspects [X,Y,Z].  A vector requires a direction, and depending on how 
sticky you
>> are, probably a length.  This implies 6 independent aspects.  Result;  A 
plane
>> requires 3 points.  Always.
>
>You're wrong. A vector is any quantity with any given number of dimensions. 
The
>number 5 is a vector, called a scalar.  The vector [x,y,z] can refer to a 
position
>vector (point) or direction vector.
>
>I suggest you take some math courses before you try to explain such basic 
concepts.

your wrong a vector and a scalar are completely different.  5 is not a vector 
called a scalar it is a scalar.  Look up in any physics book and a scalar is 
defined as any given value.  5,10,3.116, any # is a scalar but a vector is 
number WITH direction ie 5 at 13degress is a vector.

matt
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From: schumaker@tigger.jvnc.net (schumaker)
Subject: Re: 3d programming
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Date: Thu, 15 Feb 1996 00:03:38 GMT