ThomasPara

its a bit more readable like this. @P -= pivot; @P *= matrix; @P += pivot;

matrix3 m = ident(); vector axis = set(0,1,0); float angle = radians(chf("angle")*360); rotate(m,angle,axis); @P *= m; @N *= m; When you rotate the @P you also need to rotate the @N, or else it will look like the light is baked.

I guess you can ask the course teacher for help on this one, and i guess your not allowed to publicly share that file. The alembic is missing anyway so there isnt mutch we can do.

You mean if you only had a filecache with @P and points? The problem is the changing pointcount, you have no points to transfer to in the beginning and they are not located at the same position. Seems like any solution would be hacky at best.

You need to ray each point through your original mesh, and see if that occludes. Because you can have normals pointing towards you that are occluded. pigray.hip

np, happy you liked it

Particles with offseted dragshape and dragcenter is perhaps the easiest solution, and werry fast. confetti_01.hiplc

Heres a way to do it. pscaleID_v001_fix.hiplc

Impossible to know what happens inside your delete-node and vop-node. And since its all merged, the screen doesnt realy help either.

You can build a hierarchy with a string attribute, and then set the alembic_rop to build one for you. In theory if you make the same structure you can layer this in. There is a primitive type called "AlembicRef", but i havent quite figured out how that works. https://www.sidefx.com/docs/houdini/vex/functions/addprim.html

Heres a quick and dirty setup of the concept Toad was talking about. scatterbox_01.hiplc

int lines = neighbourcount(0,@ptnum);

Heres a simple try, i dont know what speeds you want. Its a copy inside this one aswell box_volume_01.hip

i guess int is rounding to nearest integer, while floor will allways go down. //floor i@rnd_value = int(floor(rand((@ptnum+1)*(chi("seed")+1))*chi("range")))+1; //rint i@rnd_value = int(rint(rand((@ptnum+1)*(chi("seed")+1))*chi("range")))+1;

point() is what gives you the current value, and setpointattrib() is what you can use to set a new value.