getting a local x,y,z coord of a vertex

[TiKiMoN]

Turn on "Echo All Commands" in the Script Editor, and then select the vertices you want coordinates for. It will show you which vertices they are, and I am sure that from there, you can get their x, y and z coordinates.

[larryvm]

you can get the local position of one vertex in the mesh node of the poly

the local position is vrts[numvertex]+pnts[numvertex]

vrts is the original local position and pnts is the tweak of this vertex

example
the position in x of the vertex 293 is

pSphere1.vrtx[293]+pSphere1.pntx[293]

[ktpr]

if I understand this correctly you basically move a vertex by 0 and it returns the result, which you capture and use?

cheers
ktpr

[ktpr]

thank you for the replies. they have helped.:applause:

In the node reference, for subdiv surfaces, it says there is a node called "vertex", which is a compound type.(file://C:\Program%20Files\AliasWavefront\Maya4.5\docs\en_US\html\Nodes\subdiv.html).

It also says that the array can be accessed using the # construct but gives no example of how to use it. My attempt to get the info gets nothing.

given subdivSphere1:
float $z[] = `getAttr subdivSphere1.vertex`
print ($z[0]); // " " <- no value

I am trying to get the vector coords of a subd point in space, which I can already do with poly vertices.

thank you for your time
cheers
ktpr

[alexx]

i strongly recommend using the command xform , which has switches to query world space coordinates from anything..

cheers

alexx

[TiKiMoN]

can you even select "points" on a subdivision surface? since they are evaluated through polygonal proxies, you can't actually select a "point" on the surface unless the detail level is extremely high, I would imagine. am I way off on this...?

[TiKiMoN]

For any points, use pointPosition -w/-l (point)... the result is an array of 3 float values [float float float]. for example:

I have a polygon sphere called pSphere1.

world coordinates :
pointPosition -w pSphere1.vtx[0];

local coordinates :
pointPosition -l pSphere1.vtx[0];

Still not sure how well that will work for subd surfaces though.

[ktpr]

alex: thanks. Xform doesn't seem to work on vertices though. Select a sud vert and run "xform -q -r -os -m;" the values are the same for everything.
---

tikimon:
(man I feel like i'm working in the dark because no one knows much about subd. The documentation is hooorrrrible)

Given a subd sphere named "subdivSphere1":

setAttr "subdivSphere1.displayLevel" 1; // where 1 should be desired level
pickWalk -d down;
querySubdiv -a 4; // selects faces.
string $vertex_list[] = `subdListComponentConversion -ff -tv`;
// print string for vertices

All this being said, does anyone understand what the # means in the flag help documentation (file://C:\Program%20Files\AliasWavefront\Maya4.5\docs\en_US\html\Nodes\flagHelp.html). I just need that damned coord of a subd vertex

again thanks
ktpr

[alexx]

not -os.. that is object space i think (no maya here)

ther is a -ws or something for world space..

i am about 102% sure.. roughly.. i counted twice

cheers

alexx

[ktpr]

:buttrock:
OMFG tikimon, you are my hero :)

pointPosition -l subdivSphere1.smp[256][67108867];

works like charm now I can finish my poly uv transfer to subd script. Screw that weird # construct.

ahhhh

[edit - actually thanks goes to everyone who replied to this thread :)]

cheers
ktpr

[TiKiMoN]

sweeeeeeeeeeeet. in an effort to make myself look less intelligent than it appeared before, I just browsed through the MEL documentation until I found that command. :p anyway, glad it works! :)

[CGTalk Moderation]

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.