Learning VEX

[Tom]

Hi, I wanted to go deeper in houdini and want to learn VEX, at least at basic level

So I have very basic question:

Is there some easier/faster way to get "y" value from P, as you can see in example I use vop_vectofloat, but I think that I saw somewhere faster way how to do this

sop
move_y(float height = 5)

{
    float tx;
    float ty;
    float tz;
    float sum;
    vector vec;

    vop_vectofloat(P, tx, ty, tz);

    sum = ty + height;

    vec = vop_floattovec(tx, sum, tz);

    P = vec;    

}

Thanks in advance,

Tom

Edited February 13, 2012 by Tom

[asnowcappedromance]

you can call components of a vector by using P.x, P.y or P.z !

cheers,

Manu

[Stalkerx777]

Also, there is getcomp/setcomp vex functions..

[anim]

I don't recommend you to learn VEX by looking at code converted from VOPs, that's not clean and contains lots of VOP wrappers and lots of intermediate variables

look at VEX docs for start or at direct VEX examples in forums

for example doc to accessing individual vector components http://www.sidefx.com/docs/houdini11.1/vex/lang#id438334

[Tom]

Thanks for answers, but...

I cant get this working, insted of moving all points up by same value, it does this:

Source geometry I used was default grid.

The code I used is below, I try'ed bunch of combinations and result was same or a grid in that direction, this is just shortest code:

#pragma label height Height
#pragma range height 0 5

sop
move_up(float height = 0)
{

    vector sum = (P.x, P.y + height, P.z);

    P = sum;

}

Here is other version:

and code:

#pragma label height Height
#pragma range height 0 5

sop
move_up(float height = 0)
{
    float sum;
    vector tempP;
    float ty = getcomp(P, 1);

    tempP = P;

    sum = ty + height;

    vector final = (P.x, sum, P.z);

    P = tempP + final;

}

That one pragma what I made is also doing nothing, if I change values.

I'm missing something?

Edited February 15, 2012 by Tom

[anim]

what about this one?

sop
move_up(float height=0)
{
    P.y += height;
}

[Tom]

Thanks anim, it realy worked!

From 9 lines went to 1

How that += function works( maybe documented)?

Edited February 18, 2012 by Tom

[Erik_JE]

sumthing += anotherthing is the same as

sumthing = sumthing + anotherthing