I need help to scale a curve based on a specified point..!

[Masoud]

Hi everyone,

Could you please take a look at the image below? I'm working on scaling a curve (which isn't at the origin) using VEX code. I need the scaling to be based on point number 0 (@ptnum = 0).

Does anyone have any ideas or suggestions on how to approach this?

Thanks in advance!

Scale.hip

[osmanertasdiken]

You can achieve this using either VEX or a transform sop with an expression on the pivot translate, I included both methods in the hip file.

Best,

Scale_odForce.hiplc

[Masoud]

Hi Osmaner

Thank you for your response. In your file, when I change the point number, the curve shifts to an undesired location.

[Masoud]

These codes helped me to achieve it:
 

vector T = chv("T");
vector R = chv("R");
vector S = chv("S");

vector pivot = point(0, "P", chi("Point_Number"));

matrix m = maketransform(0,0,T,R,S);
matrix m2 = ident();

translate(m2,-pivot);
m2 *= m;
translate(m2,+pivot);

v@P *= m2;