Re-Create nConstraints by API

[David Lantos]

Hi Guys!

I'm doing a reasearch how can nConstraints be recreated by api. I've found nConstraints don't have a solid data structure.

Here is, approximately, how nodes are connected:

mesh1 -> nCloth1 -> nComponent1 -> dynamicConstraint.ids[0]
mesh2 -> nCloth2 -> nComponent2 -> dynamicConstraint.ids[1]

The nConstraint gets NId data type. I checked the api's doc but It looks like a black box.

The question is, do anybody have any ideas how can I get the component ids are used by constraints?

[Marcus Ottosson]

Something I typically do when trying to figure out how to populate some undocumented data member is to look at how Maya Ascii does it.

For example..

• nconstraint.ma

...
createNode dynamicConstraint -n "dynamicConstraintShape1" -p "dynamicConstraint1";
...
connectAttr "dynamicConstraintShape1.evs" "nucleus1.is[0]";
connectAttr "dynamicConstraintShape1.evc" "nucleus1.ic[0]";
connectAttr "nComponent1.ocp" "dynamicConstraintShape1.cid[0]";
connectAttr "nComponent2.ocp" "dynamicConstraintShape1.cid[1]";
connectAttr ":time1.o" "dynamicConstraintShape1.cti";

This is everything related to the constraint itself, and..

...
createNode nComponent -n "nComponent1";
    rename -uid "5CA944EE-46C7-5933-6EF2-70B733AACB38";
    setAttr ".ct" 2;
    setAttr ".el" 2;
...
connectAttr "nComponent1.ocp" "dynamicConstraintShape1.cid[0]";
...
connectAttr "nClothShape1.nuid" "nComponent1.obid";
...
// End of temp.ma

These are everything related to the nComponent. From here you might be able to figure out how to replicate this with API calls.

​

[David Lantos]

Sorry I did a bit mistake. I would like to store (like in json) the data used for creating nConstraint. What I actually need is the component ids per mesh.
I got NId from nComponent that seems useless for me. Is there any way to get component list from nComponent?

[David Lantos]

Ok, meanwhile I just realized there is ".componentIndecies" attribute. Somehow it was hidden. Now I have everything to recreate. Thanks!

2018. január 15., hétfő 11:05:34 UTC-8 időpontban Marcus Ottosson a következőt írta: