custom smoosh deformer

[jonidunno]

Hey All!

I'm trying to replicate a piece of geo as if it were pressed up against a pane of glass. I was trying to solve this without any simulations can someone point me in the right direction? Here is what I started with a sample scene. here is an image of what I wanna achieve. I think I need to do it with an attribute because eventually, I need to apply this to an alembic animation of a character so I cannot depend on position.

 

Thanks in advance!

 

jl_smoosh_v001.hiplc

[Librarian]

@jonidunno check also Five Elements Elf Otls for Vex solution.
Here is Vop.

dv1.hiplc dv2.hiplc

Edited November 3, 2023 by Librarian

[konstantin magnus]

Hi @jonidunno,

you can project a mesh onto a plane using the planepointdistance-function with a grid on the second input:

// PARAMETERS
float in = chf('in');
float out = chf('out');
float off = chf('offset');
float soft = chf('soften');

// PLANE
vector p;
vector pos_pt = point(1, 'P', 0);
vector nml = prim_normal(1, 0, vector(0.0));
float d = planepointdistance(pos_pt, nml, v@P, p);
vector plane = p + normalize(nml) * off;

// MASK
vector dir = normalize(pos_pt - v@P);
float angle = dot(dir, nml);
float sdist = sign(angle) * d;
float bias = smooth(-out, in, sdist);
float mask = smooth(-soft, soft, sdist);
vector pos = lerp(v@P, plane, bias);

// OUTPUT
f@mask = mask;
v@P = pos;

Later I might discuss the code a bit here: https://procegen.konstantinmagnus.de/pressing-meshes-against-a-plane

pressing_plane.hipnc

[hannes603]

There is a node in houdini, which is called: ray .  maybe check some tuts on youtube its really super simple!

Geo_against_Glass_press_ray_node.hip

[jonidunno]

These are all such great solutions thanks so much for the files and the knowledge!