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Thread: using the <p> and <v>

  1. #1
    Junior Member
    Join Date
    Mar 2010
    Posts
    2

    using the <p> and <v>

    hello if got a question regarding the

    and <v> elements
    How does the offset work, where are the indices ?

    example

    Code :
    <mesh>
    <source id="position"/>
    <source id="texcoord0"/>
    <source id="texcoord1"/>
    <vertices id="verts">
    <input semantic="POSITION" source="#position"/>
    </vertices>
    <lines count="2">
    <input semantic="VERTEX" source="#verts" offset="0"/>
    <input semantic="TEXCOORD" source="#texcoord0" offset="1"/>
    <input semantic="TEXCOORD" source="#texcoord1" offset="1"/>
     
     
    10 10 11 11 21 21 22 22</p>
    </lines>
    </mesh>

    do i , for the first input, use (10,10) as start point and (11,11) as ending ? where does offset one start for input 2 and 3?

    thank you.

  2. #2
    Senior Member
    Join Date
    Aug 2004
    Location
    California
    Posts
    771

    Re: using the <p> and <v>

    Quote Originally Posted by lumpin
    do i , for the first input, use (10,10) as start point and (11,11) as ending ? where does offset one start for input 2 and 3?
    Yes. From your example, the samples are: line1[p(10,10), p(11,11)], line2[p(21,21), p(22,22)].

  3. #3
    Junior Member
    Join Date
    Mar 2010
    Posts
    2

    Re: using the <p> and <v>

    thanks.
    but what about the offset? do i for offset = 1 start with [11,11] ?

  4. #4
    Senior Member
    Join Date
    Aug 2004
    Location
    California
    Posts
    771

    Re: using the <p> and <v>

    Given two inputs:

    input A, offset=0
    input B, offset=1

    ... then count=3 samplings go like this:

    Code :
     
     0 1 2 3 4 5

    ... producing p1[0,1], p2[2,3], p3[4,5].

    Add a third input with a shared offset:

    input A, offset=0
    input B, offset=1
    input C, offset=1

    ... produces p1[0,1,1], p2[2,3,3], p3[4,5,5].

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