follow path how to get actual transform of the object

[ino]

if i have an object with a follow path constraint network 

how can i get the 3d position of the object

although the object is moving along the path its position isnt changing in the spreadsheet 

[anim]

50 minutes ago, ino said:

although the object is moving along the path its position isnt changing in the spreadsheet 

what spreadsheet? parameter spreadsheet?

the parameters on each Object represent it's local transform, which is applied on top of it's Parent Transform, Subnet Trandform and Pre-Transform, additionally Constraints can query any of those transforms or combination and produce final world space transform 

you can query it using Object CHOP, optransform() VEX function, node.worldTransform() Python Function, origin() Hscript function among others

you can also objectmerge geo of such object into SOPs and if you Pack Before Merging, the merged geo will have packedfulltransform intrinsic containing the world transform of that object

...

[ino]

thanks 

you obviously know what you are talking about 

yes its the parameter spreadsheet i meant 

i would need the transformed position in a wrangler to set color depending on position

 

 

in the meantime i figured i can use

right click / reference / scene data / my object / transformation ...

and i get this 

if i copy this straight in to a wrangler i get a bunch of errors not a big thing that i could probably fix

in the end this is fine and will work 

BUT is there really now easier way

something like 

x = getmetransform("object", "position", "X");

z = getmetransform("object", "rotation", "Z");

and not 10 lines of code where i need to add each and every transformation of the object one by one by hand 

 

 

{

matrix src_input_xform_inverted = invert(optransform(opinput("../../pen", 0)));
matrix src_xform = optransform("../../pen");
matrix src_local_xform = src_xform * src_input_xform_inverted;
matrix target_xform_inverted = invert(optransform(opcreator(".")));
matrix final_xform = src_local_xform * target_xform_inverted;


matrix rest_xform = identity(4);
matrix self_xform = rest_xform * final_xform;

float result = explodematrixpr(
        self_xform, 
        vector3(ch("./px"), ch("./py"), ch("./pz")),
        vector3(ch("./prx"), ch("./pry"), ch("./prz")),
        chs("./xOrd"), chs("./rOrd"), "TX");
return result;

}

 

[ThomasPara]

You could "object merge" inn a null and use that as a reference. Simplest i can think of now.

[anim]

5 hours ago, ino said:

BUT is there really now easier way

something like 

x = getmetransform("object", "position", "X");

now I'm not sure if you read through my post at all, but as I mentioned you can use origin() Hscript expression

origin("", "../path/to/object", "TX")

[ino]

thx again