Forums Houdini Indie and Apprentice Position a point relative to two other points?

Position a point relative to two other points?

   2559   1   0
User Avatar
reelinspirations
Member
178 posts
Joined: Nov. 2015
Offline
 
Hi,

I'm working in a PointWrangle and attempting to create a point at a position based on the X and Y relative position of two other points.

See image below.


How do I take the x,y,z of point 0 and point 1 and create a position for point 2 that's a percentage of the x and y?

I'm guessing there may be some vector math involved, but I'm not a math guy.

Here is how I'm creating the two points which is working well.
The x,y,z values here are ‘hard coded’ but in my final working node, they will not be. I need to figure this out by referencing the points.

int pnt0 = addpoint(0,{0,0,0});
int pnt1 = addpoint(0,{1,1,0});

int prim0 = addprim(0,“polyline”);

int vert0 = addvertex(0,prim0,pnt0);
int vert1 = addvertex(0,prim0,pnt1);

Any help would be appreciated.

Jim
Reel Inpsirations
Houdini Work in Progress [vimeo.com]
 Report
User Avatar
tamte
Member
9376 posts
Joined: July 2007
Offline
 
just from the top of my head, hopefully works

if P0 and P1 are positions of your points
then 
float blend = chf("blend") // 0-1 blend ratio between P0 and P1
@P = lerp(P0, P1, blend);

or for per component blends
vector blend = chv("blend") // 0-1 xyz blend ratios between P0 and P1
@P.x = lerp(P0.x, P1.x, blend.x);
@P.y = lerp(P0.y, P1.y, blend.y);
@P.z = lerp(P0.z, P1.z, blend.z);
Tomas Slancik
CG Supervisor
Framestore, NY
 Report
  • Quick Links