Hi Michael,
Thank you for taking the time to look at this.
I am aware of the last 4 lines doing things one item at a time but here is
the problem...When I run it this way(Code below) I get an error:
NotImplementedError: ...Wrong number or type of arguments for overloaded
function 'MFnMesh_setVertexColors'. It seems that I have a valid list of
vertex indices but I am in question about the mesh being chosen for use in
the setVertexColors function.
My goal is to get the verts of a certain material on each mesh and paint
them with vertex color quickly. the mesh is tiled into several objects and
the material can exist across multiple tiles of mesh.The one vert at a time
method as you said is very slow. So maybe make a list of the verts of
materialA on tileA, then paint them, move on to tileB, paint, move to
tileC, paint. I think your suggestion of looping once per object is the key.
objectAllVerts is a list with elements like
this.....u'Object_Tile_Q1_A2.vtx[4979:5528]',
u'Object_Tile_Q1_B1.vtx[3160:3486]' and it can in some cases contains
elements of the same mesh but a different group of verts. Maybe sort this
list and build vert lists from the matching mesh names? Not sure how to do
that....
for n in objectAllVerts:
cmds.select(n)
sel = api.MSelectionList()
api.MGlobal.getActiveSelectionList(sel)
compIter = api.MItSelectionList(sel, api.MFn.kMeshVertComponent)
component = api.MObject()
meshDagPath = api.MDagPath()
meshObj = om.MObject( )
sel.getDependNode(0,meshObj)
meshFn = om.MFnMesh(meshObj)
vList = []
colorVertexList = api.MColorArray ( )
while not compIter.isDone():
compIter.getDagPath(meshDagPath, component)
if not component.isNull():
vertIter = api.MItMeshVertex(meshDagPath, component)
while not vertIter.isDone():
vList.append(vertIter.index())
vertIter.next()
compIter.next()
colorVertexList = [api.MColor(1,0,0,1)]*len(vList)
meshFn.setVertexColors(colorVertexList, vList)
On Wednesday, October 11, 2017 at 10:23:44 PM UTC-6, Michael Boon wrote:
> Just some thoughts on this, without running it:
>
> - cmds.sets has a flag "flatten" that will give you components
> individually, so you don't need to worry about separating out the colon.
> - I am confused about what all that code at the start does. It looks
> like you get the "Dirt" material, then get the first face it's assigned
> to,
> then get the material assigned to that face, which is the one you started
> with, right? I must be misunderstanding that.
> - cmds.ls also has a "flatten" switch, I think (in case that's useful)
> - You have a loop over objectAllVerts. Does that loop once per object?
> - The new API (maya.api.OpenMaya) is easier to use unless you're a C++
> person. A lot of things that you are using two lines for become one line,
> eg "sel = api.MGlobal.getActiveSelectionList".
> - I _think_ you can use MFnSingleIndexedComponent instead of
> MItMeshVertex. Then you can use getElements to get your MIntArray instead
> of building it one piece at a time.
> - Using the new API, you last four lines could be done like this, and
> would probably run faster:
> colorVertexList = [api.MColor(1,0,0,1)] * len(vList)
> meshFn.setVertexColors(colorVertexList, vList)
>
>
> On Thursday, 12 October 2017 04:01:36 UTC+11, Mark Mazzei wrote:
>>
>> Hi Justin,
>>
>> I know this thread is old but hopefully you con help me out. I am new to
>> scripting in Maya. I have a script going that gives me a selection of all
>> faces across multiple objects that I want to apply vertex color to.
>> I have a python method working but it is very slow. I am attempting to
>> use the api since I hear it is faster. I used the code you pasted below and
>> was finally able to get component selection into a list. When I use the
>> resulting list of vertex indices from your code with a color array I have
>> made with setVertexColors, I get an overloaded function error. the point I
>> ran into the problem was in getting the appropriate object that the face
>> selection was tied to. My workaround was to use a for loop and
>> setVertexColor(colorVertexList[I], vList[I]). It works but is pretty much
>> the same speed as before, i'm sure since I am marching each index one at a
>> time. How would I set vertex color on the verts in vList calling
>> setVertexColors properly? Any advice is much appreciated.
>>
>> Here is what I have, using your method for getting the vertex idexes:
>>
>> import maya.OpenMaya as api
>> import maya.cmds as c
>> import maya.mel as mm
>>
>> shadingGroup = cmds.listConnections('Dirt', type='shadingEngine')
>> componentsWithMaterial = cmds.sets(shadingGroup, q=True)
>> cmds.select(componentsWithMaterial)
>> first_face = componentsWithMaterial[0].split(":")[0]
>> if ']' in first_face:
>> selectedFace = str(first_face)
>> else:
>> selectedFace = str(first_face) + ']'
>> cmds.select(selectedFace)
>> facetSG = cmds.hyperShade(smn=True)
>> shader = cmds.ls(selection=True)
>> cmds.select(shader)
>> cmds.hyperShade(objects='')
>> objectAllFaces = cmds.ls(selection=True)
>> objectAllVerts = cmds.ls(cmds.polyListComponentConversion(objectAllFaces,
>> ff=True, tv=True))
>>
>> for n in objectAllVerts:
>> cmds.select(n)
>> sel = api.MSelectionList()
>> api.MGlobal.getActiveSelectionList(sel)
>> compIter = api.MItSelectionList(sel, api.MFn.kMeshVertComponent)
>> component = api.MObject()
>> meshDagPath = api.MDagPath()
>> meshObj = om.MObject( )
>> sel.getDependNode(0,meshObj)
>> meshFn = om.MFnMesh(meshObj)
>> vList = []
>> colorVertexList = api.MColorArray ( )
>> while not compIter.isDone():
>> compIter.getDagPath(meshDagPath, component)
>> if not component.isNull():
>> vertIter = api.MItMeshVertex(meshDagPath, component)
>> while not vertIter.isDone():
>> vList.append(vertIter.index())
>> vertIter.next()
>> compIter.next()
>> for i in range(len(vList)):
>> colorVertexList.append(1.0,0.0,0.0,1.0)
>> for i in range(len(vList)):
>> meshFn.setVertexColor(colorVertexList[i], vList[i])
>>
>>
>> On Sunday, November 27, 2011 at 1:05:02 PM UTC-7, Justin Israel wrote:
>>
>>> Thanks. I am quite lovely aren't I? LOL
>>>
>>> Here is a rough example that I thought of, using python commands and
>>> assuming a start and end selection
>>> https://gist.github.com/1398060
>>>
>>> I don't really check the original selection to see if its only two
>>> vertices or faces, but this should give you an idea. Hopefully I didn't
>>> over-think your problem.
>>> I used a regex to get the int vert/face number instead of using the maya
>>> api since that approach seems like too much code just to get the index from
>>> the selection:
>>>
>>> import maya.OpenMaya as api
>>>
>>> sel = api.MSelectionList()
>>> api.MGlobal.getActiveSelectionList(sel)
>>> compIter = api.MItSelectionList(sel, api.MFn.kMeshVertComponent)
>>>
>>>
>>> component = api.MObject()
>>> meshDagPath = api.MDagPath()
>>>
>>>
>>> vList = []
>>>
>>> while not compIter.isDone():
>>> compIter.getDagPath(meshDagPath, component)
>>> if not component.isNull():
>>> vertIter = api.MItMeshVertex(meshDagPath, component)
>>> while not vertIter.isDone():
>>> vList.append(vertIter.index())
>>> vertIter.next()
>>> compIter.next()
>>>
>>>
>>> I may be a little slow from the holiday weekend and overlooked some
>>> easier way to do it. But thats as much as I can do with a bunch of turkey
>>> in my stomach :-)
>>>
>>> -- justin
>>>
>>>
>>> On Nov 27, 2011, at 4:57 AM, Reza Shahsavary wrote:
>>>
>>> thx Justin
>>> ur Lovely
>>> but 2 questions if u don't mind!
>>> 1.what should i do if want to select my component mesh without typing
>>> surface name i.g :p.sphere..i`d like to do that with selection mesh
>>> 2.i just need to select my components in one direction(horizontal or
>>> vertical)
>>> thx
>>> P.M:i just uploaded a photo from maya.i need to selection like
>>> that.actually its selected by hand :)
>>>
>>>
>>> --
>>> view archives: http://groups.google.com/group/python_inside_maya
>>> change your subscription settings:
>>> http://groups.google.com/group/python_inside_maya/subscribe
>>> <my selection.jpg>
>>>
>>>
>>>
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