Author: admin

Archived post by trzanko

here’s a simple example of a 2d wfc running on points in houdini ( have yet to expand to 3d )

it pretty much comes down to: you can only be what your neighbors say you can be, and whoever has the least amount of options, randomly select from it’s choices based on probability and set yourself, then repeat

it doesn’t matter what the deformation is on the tiles

you could do it on any volume of points with clean connectivity

if you can do a neighbour lookup, it doesn’t matter what the tiles are, though it becomes a bit weirder because what you put in those tiles has to deform to that tile’s space

imo wfc is one of the best candidates for some super cool procedural stuff

would love to have a sec to explore this more or on a project, this sketch is from last year which is the last time we talked about it i think

maxim’s stuff is what inspired this sketch

oskar’s implementation is way way sexier because it’s dynamic and interactive

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20194308/24/19/tr_wfc_v4.mp4
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20194308/24/19/tr_wfc_v4.hip

Archived post by Reinhold

looks like vtx0 is {0, 0, 0}, vtx1 is {1, 0, 0}, vtx2 is {0, 1, 0} and vtx3 is {0, 0, 1}. and any point in between is just a linear interpolation of these four values. shouldn’t take too long to get there now

got it working now. building a matrix from the tet vertex positions and running an inverse transform on the point position puts the sample point into the normalized barycentric space, i.e. the new point position is the barycentric coordinate

“` int prims[]; vector p = v@P; vector vtxp[];
prims = primfind(1, v@P, v@P);
foreach(int prim; prims) { for(int i=0; i<4; i++) { vtxp[i] = vector(point(1, "P", primpoint(1, prim, i))); } matrix3 mat = set(vtxp[1] - vtxp[0], vtxp[2] - vtxp[0], vtxp[3] - vtxp[0]); p -= vtxp[0]; p *= invert(mat); } v@uv = p;“`

Archived post by aswaab

@flight404

here’s a chops way of doing it. I have something in there that will remove any scaling from the world cam/nulls, etc.

Knowing the CHOPS way is cool because you can do things like time-shift, retime, filter, sample, etc. Good to know even if not for your specific case tonight.

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20194208/22/19/get_world_cam.hiplc

Archived post by TOADSTORM

here’s what i was thinking. this would work better using point attributes as the bias instead of just a global bias. this will blend the position and orientation of packed rigid bodies back to their original positions/orientations, during the simulation so collisions are preserved.

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20191308/15/19/blend_rbd_toadstorm.hiplc