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Houdini Recipe:Wrangle Memo 01

VEX sentence of Wrangle.

Global Varialbles that frequently used

//SOP
@Cd      //Point Color
@P       //Point Position
@v       //Point Velocity
@ptnum   //Processing Point Number
@pscale  //Particle Scale
@numpt   //Total Point Number
@N       //Normal

//Time
@Frame;  //Frame
@Time;   //Time

 

Attribute read and write

//By Type
f@Float = 1.0; //float
i@ID = @ptnum;  //int
v@Vec = {0,1,2};//vector
u@UV = {4,5};   //vector2
s@Text = "name";//string

//Individual access (Position)
@P.x = @P.x + rand(@ptnum);
@P.y = anoise(@P.y);
@P.z = fit01(@P.z,0,5);

//Individual access (Color)
@Cd = {1,0,0};
@Cd.g = @Cd.g+1;

 

Add Point

vector pos = {0,0,0};
addpoint(geoself(), pos); 

 

Add Primitive(Line)

int prim = addprim(geoself(), "polyline");
addvertex(geoself(), prim, 0);
addvertex(geoself(), prim, 1);

 

Add Primitive(Face)

int nPoly = 3;

if(@ptnum%3 == 0){
    int prim = addprim(0, "poly");
    for(int i=0; i<nPoly; i++){
        addvertex(0, prim, @ptnum+i);
    }
}

(Create the Face everty ptnum order three poins from the input point)


 

Remove Point

if (@ptnum%5==0){
    removepoint(geoself(),@ptnum);
}

(remove the point that ptnum is  multiple of 5 )


 

Remove Primitive

if (@primnum%2==1){
    removeprim(geoself(), @primnum, 1);
}


 

Create Group

if(@ptnum &amp;amp;amp;amp;lt; chi('threshold')){
    i@group_mygroup=1;
}
if(@ptnum == 10){
    i@group_mygroup=0;
}

Set and see the group in the form of [@group_*].
Any of  group name to *.
this group is int type.
Check if they belong to a group・・・ [@group_*==1].
Add to group・・・[i@group_*=1] Remove from the group・・・[i@group_*=0]

 

Create Group (other method)

string gpName = &amp;amp;amp;amp;quot;testGroup&amp;amp;amp;amp;quot;;

for(int i=0; i&amp;amp;amp;amp;lt;@numpt; i++){
  if(@P&amp;amp;amp;amp;gt;0){
        setpointgroup(geoself(), gpName, @ptnum, 1 ,&amp;amp;amp;amp;quot;set&amp;amp;amp;amp;quot;);
    }
}

When making groups of primitive “setprimgroup”.


 

 

Create Parameters from the description
HoudiniWrangleSample

 

 

Samplefile
WrangleSample_01
.hiplc

 

Version:Houdini 14
Wrangle method of description must be careful because there is a case to be changed depending on the version.

 

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