Houdini VEX Temp - Revision history

Bernie: /* points to curves */

2024-06-04T15:45:15Z

points to curves

← Older revision		Revision as of 17:45, 4 June 2024
Line 5:		Line 5:
	float dist = xyzdist(1,@P,primN,primUv);		float dist = xyzdist(1,@P,primN,primUv);

			float minspeed = chf('minspeed');
			float maxspeed = chf('maxspeed');

			primUv[0] = (primUv[0]+@Time*fit01(rand(@ptnum),minspeed,maxspeed))%1;
	vector pos = primuv(1,"P",primN,primUv);		vector pos = primuv(1,"P",primN,primUv);

Line 14:		Line 17:
	@P = lerp(pos,@P,chf('lerp'));		@P = lerp(pos,@P,chf('lerp'));
	</pre>		</pre>

	=== topo transfer ===		=== topo transfer ===

Bernie: /* topo transfer */

2024-06-04T15:34:33Z

topo transfer

← Older revision		Revision as of 17:34, 4 June 2024
Line 1:		Line 1:
			===points to curves===
			<pre>
			int primN;
			vector primUv;
			float dist = xyzdist(1,@P,primN,primUv);


			vector pos = primuv(1,"P",primN,primUv);

			//cast variables if needed
			f@dist = dist;
			i@primN = primN;
			v@primUv = primUv;
			@P = lerp(pos,@P,chf('lerp'));
			</pre>
	=== topo transfer ===		=== topo transfer ===

Bernie: /* Sample Randoms */

2024-03-29T14:06:24Z

Sample Randoms

← Older revision		Revision as of 16:06, 29 March 2024
Line 1:		Line 1:
			=== topo transfer ===

			<pre>
			string vals[] =split(chs("../topotransfer2/sourcepos1",0));
			string coord[] = split(vals[@ptnum],',');
			string pos = vals[@ptnum];
			string x = split(pos,',')[0];
			string y = split(pos,',')[1];
			string z = split(pos,',')[2];
			@P = set(atof(x),atof(y),atof(z));
			</pre>

	=== Sample Randoms ===		=== Sample Randoms ===

Bernie: /* Fuse and accumulate pscale */

2023-02-15T16:48:46Z

Fuse and accumulate pscale

New page

=== Sample Randoms ===

<pre>
vector2 randV = rand(@ptnum);
@P = sample_circle_uniform(randV);
@P = sample_circle_edge_uniform(rand(@ptnum));
@P = sample_circle_ring_uniform(randV,.65);
@P = sample_circle_slice({0,1},3.14/4,randV);
</pre>

=== Fuse and accumulate pscale ===

https://i.imgur.com/TRVWVDY.gif

requires id = ptnum
<pre>
float accumulation = 0;
if(@group_snapped_points){
int pts[] = findattribval(0,"point","snapped_to",@ptnum);
i@fusedpts = len(pts);
foreach(int id;pts){
accumulation += pow( point( 0, "pscale", id ) / 2.0 , 3 );
}
@pscale = 2 * pow(accumulation , 1.0/3);
}

if(@snapped_to != -1 && @ptnum != @snapped_to){
removepoint(0,@ptnum);
}
</pre>

===Attractors===
https://i.imgur.com/gqh7Ckm.png

attr wrangle
<pre>
float radius = chf('max_radius');
int maxpoints =chi('max_points');

int pnum;
for(int i=0;i<npoints(1);i++){
vector pos = point(1,"P",i);

int pc = pcopen(0,'P',pos,radius,maxpoints );
while(pciterate(pc)){
pcimport(pc,'point.number',pnum);
vector p = point(0,'P',pnum);

float ratio = length(pos-p)/radius;
float falloff = chramp('falloff',ratio);
vector newpos = lerp(pos,p,falloff);

//addColor
vector newcol = hsvtorgb(float(rand(pos)),falloff,1);
setpointattrib(0,'Cd',pnum,newcol);
setpointattrib(0,'P',pnum,newpos);
setpointattrib(0,'falloff',pnum,falloff);
}
}
</pre>

i think it's slow and stupid this is better (point wrangle)

<pre>
float maxdist = chf('maxdistance');

float @distance[];
for(int i=0;i<npoints(1);i++){
vector pos = point(1,'P',i);
float dist = clamp(distance(@P,pos)/maxdist,0,1);
float falloff = chramp('falloff',1-dist);
@P = lerp(@P,pos,falloff);
//append(@distance,distance(@P,pos));
append(@distance,dist);
}
</pre>