[Maya-Python] rewrite maya follicle node

Discussion:

Zhen Huang

2018-11-19 08:57:49 UTC

Hi ,

I want to rewrite maya follicle node , the idea for this is because :
----1 , polygon basic follicle is much faster than classic rivet , even
matrix basic rivet , I think it's because the extra calculation on
'curveFromEdge' and 'loft'
----2 , maya default follicle can't change axis of orientation
And I'd like to remove the rest of dynamic parameters and functions.

From the rough view , seems the follicle node read the position and tangent
from polygoon directly , and after researching the MFnMesh class , I don't
get any function like getPositionAtUV or getNormalAtUV , getTangentAtUV .

Will be a great appreciation if you can figure out the key of this custom
follicle node .

Big Thanks and best ,
John HZ

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Angelo Sta. Catalina

2018-11-19 14:30:01 UTC

Permalink

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate using
connected points.

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Zhen Huang

2018-11-20 08:07:34 UTC

Permalink

Seems a good idea , are you mind introduce more please . Thanks .

I found the MFnMesh updated a lot , there is a getPointAtUV method .
Position solved .

How about rotation , any idea ?

Normal can get from interpolation of 3 points normal .
Tangent should base on UV , have no idea yet .

åš 2018å¹Ž11æ19æ¥ææäž UTC+8äžå10:30:17ïŒAngeloåéïŒ

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate using

connected points.

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Angelo Sta. Catalina

2018-11-20 13:54:37 UTC

Permalink

I recommend you get Chad Vernon's "Applied 3d Math" video tutorial found
here
<https://www.cgcircuit.com/course/applied-3d-math?affid=084fa76a5ad4e37ee02f0fb98fd229b4ed900c0c1aea6f5ba4e330927a0d65f606af5a9ebad4b731f8b6036fa27758765636bec02ae95f3f30765a390979b9c6>
.

It goes over how to construct rotation from 3 points (basically a rivet).

Post by Zhen Huang
Seems a good idea , are you mind introduce more please . Thanks .
I found the MFnMesh updated a lot , there is a getPointAtUV method .
Position solved .
How about rotation , any idea ?
Normal can get from interpolation of 3 points normal .
Tangent should base on UV , have no idea yet .
åš 2018å¹Ž11æ19æ¥ææäž UTC+8äžå10:30:17ïŒAngeloåéïŒ

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate using

connected points.

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Michael Boon

2018-11-21 03:54:22 UTC

Permalink

You can get the tangent and binormal at each corner of a face of a MFnMesh.
Those are based on the UV directions. You would have to choose one, or
interpolate for a position in the middle of a face.

Post by Angelo Sta. Catalina
I recommend you get Chad Vernon's "Applied 3d Math" video tutorial found
here
<https://www.cgcircuit.com/course/applied-3d-math?affid=084fa76a5ad4e37ee02f0fb98fd229b4ed900c0c1aea6f5ba4e330927a0d65f606af5a9ebad4b731f8b6036fa27758765636bec02ae95f3f30765a390979b9c6>
.
It goes over how to construct rotation from 3 points (basically a rivet).

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate using

connected points.

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Zhen Huang

2018-11-21 06:19:03 UTC

Permalink

Thanks Michael , I found a api function to have the correctly normal and
tangents depends on UV directions which called MItMeshPolygon.getAxisAtUV ,
perfectly matched follicle's behavior , will post out soon .

åš 2018å¹Ž11æ21æ¥ææäž UTC+8äžå11:54:23ïŒMichael BoonåéïŒ

Post by Michael Boon
You can get the tangent and binormal at each corner of a face of a
MFnMesh. Those are based on the UV directions. You would have to choose
one, or interpolate for a position in the middle of a face.

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate

using connected points.

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zhen huang

2018-11-21 15:52:04 UTC

Permalink

Hey , before going to C++ I wrote a python script to verify , it works
great , the behavior totally same as maya default follicle .

[image: 02.png][image: 03.png] <about:invalid#zClosurez>[image: 01.png]
<about:invalid#zClosurez>

As you can see , I test with 2 poly cubes with same manually tweaked UV ,
the method works both hard edge and soft edge . Post the script below just
a feedback of this subject.

Currently not sure the speed yet , cos it hasn't been converted to C++ .
Will have a final feedback about this method . Thanks !

import maya.OpenMaya as om

import pymel.core as pm

def getDagPath(node):

selectionList = om.MSelectionList()

selectionList.add(node)

pathNode = om.MDagPath()

selectionList.getDagPath(0, pathNode)

return pathNode

###### inputs

meshShape = 'pCubeShape1'

#uv = [0.415 , 0.495]

uvs = [(0.415,0.495) , (0.339 , 0.535)]

### use pymel to get api function and dag path

#pmm = pm.PyNode('pCubeShape1')

#dag = pmm.__apimdagpath__()

#fm = pmm.__apimfn__()

### use api to get function and dag path

dag = getDagPath(meshShape)

fm = om.MFnMesh(dag)

###### compute start

###

util2 = om.MScriptUtil()

### define normal tangents

normal = om.MVector()

uTangent = om.MVector()

vTangent = om.MVector()

### define pos MPoint

pos = om.MPoint(0.0,0.0,0.0)

### walk through meshPolygon , try to just walk through just one time for
multiply inputs to save calculation time

faceIndex = -1

mit = om.MItMeshPolygon(dag)

outMatrixes = om.MMatrixArray()

while not mit.isDone():

for uv in uvs:

util2.createFromList(uv , 2)

float2ParamUV = util2.asFloat2Ptr()

try:

mit.getAxisAtUV(normal,uTangent , vTangent , float2ParamUV)

mit.getPointAtUV(pos,float2ParamUV)

#print '+++ +++' , mit.index()

#print list(normal) , list(uTangent) , list(vTangent) , list(pos)

faceIndex = mit.index()

### start to build matrix

normal.normalize()

### get none shear tangents

newVTangent = uTangent ^ normal

newUTangent = normal ^ newVTangent

newVTangent.normalize()

newUTangent.normalize()

newUTangent = newUTangent*-1

###### output , return matrixices and faceIndex

### write om matrix , can change axis order here

matrix = om.MMatrix()

for x in xrange(3):

om.MScriptUtil.setDoubleArray(matrix[0], x, newUTangent[x])

om.MScriptUtil.setDoubleArray(matrix[1], x, newVTangent[x])

om.MScriptUtil.setDoubleArray(matrix[2], x, normal[x])

om.MScriptUtil.setDoubleArray(matrix[3], x, pos[x])

outMatrixes.append(matrix)

except:

#print '--- ---' , mit.index()

pass

mit.next()

###

### test in pymel

for i in range(outMatrixes.length()):

pmatrix = pm.dt.Matrix(outMatrixes[i])

ll = pm.spaceLocator()

pm.xform(ll,ws = 1 , m = pmatrix)

åš 2018å¹Ž11æ21æ¥ææäž UTC+8äžå2:19:04ïŒZhen HuangåéïŒ

Post by Zhen Huang
Thanks Michael , I found a api function to have the correctly normal and
tangents depends on UV directions which called MItMeshPolygon.getAxisAtUV ,
perfectly matched follicle's behavior , will post out soon .
åš 2018å¹Ž11æ21æ¥ææäž UTC+8äžå11:54:23ïŒMichael BoonåéïŒ

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate

using connected points.

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zhen huang

2018-11-24 14:07:07 UTC

Permalink

Hi ,

I've done for the custom follicle , and found the speed is much slower than
maya follicle .

So I did what @Angelo mentioned method to have another plugin with 3 points
orthonormal coordinate . The inputs is 5 , index of A,B,C point and UV , so
sad even this simple pure math function can't run faster than maya follicle
,
the frame rate of 3 points method is around 16 fps with 1000 rivets , (I
just did crossing from BA and CA , define the U from A to BC , define V
from AB to BC , to have the tangent and position , basic simple math
operation ).
and maya follicle in same number is around 60 fps

What a terrible result that I've done all I can do , please help and
discuss if you got anything about this topic .

Thanks ,

åš 2018å¹Ž11æ21æ¥ææäž UTC+8äžå11:52:04ïŒzhen huangåéïŒ

Post by zhen huang
Hey , before going to C++ I wrote a python script to verify , it works
great , the behavior totally same as maya default follicle .
[image: 02.png][image: 03.png][image: 01.png]
As you can see , I test with 2 poly cubes with same manually tweaked UV ,
the method works both hard edge and soft edge . Post the script below just
a feedback of this subject.
Currently not sure the speed yet , cos it hasn't been converted to C++ .
Will have a final feedback about this method . Thanks !
import maya.OpenMaya as om
import pymel.core as pm
selectionList = om.MSelectionList()
selectionList.add(node)
pathNode = om.MDagPath()
selectionList.getDagPath(0, pathNode)
return pathNode
###### inputs
meshShape = 'pCubeShape1'
#uv = [0.415 , 0.495]
uvs = [(0.415,0.495) , (0.339 , 0.535)]
### use pymel to get api function and dag path
#pmm = pm.PyNode('pCubeShape1')
#dag = pmm.__apimdagpath__()
#fm = pmm.__apimfn__()
### use api to get function and dag path
dag = getDagPath(meshShape)
fm = om.MFnMesh(dag)
###### compute start
###
util2 = om.MScriptUtil()
### define normal tangents
normal = om.MVector()
uTangent = om.MVector()
vTangent = om.MVector()
### define pos MPoint
pos = om.MPoint(0.0,0.0,0.0)
### walk through meshPolygon , try to just walk through just one time for
multiply inputs to save calculation time
faceIndex = -1
mit = om.MItMeshPolygon(dag)
outMatrixes = om.MMatrixArray()
util2.createFromList(uv , 2)
float2ParamUV = util2.asFloat2Ptr()
mit.getAxisAtUV(normal,uTangent , vTangent , float2ParamUV)
mit.getPointAtUV(pos,float2ParamUV)
#print '+++ +++' , mit.index()
#print list(normal) , list(uTangent) , list(vTangent) , list(pos)
faceIndex = mit.index()
### start to build matrix
normal.normalize()
### get none shear tangents
newVTangent = uTangent ^ normal
newUTangent = normal ^ newVTangent
newVTangent.normalize()
newUTangent.normalize()
newUTangent = newUTangent*-1
###### output , return matrixices and faceIndex
### write om matrix , can change axis order here
matrix = om.MMatrix()
om.MScriptUtil.setDoubleArray(matrix[0], x, newUTangent[x])
om.MScriptUtil.setDoubleArray(matrix[1], x, newVTangent[x])
om.MScriptUtil.setDoubleArray(matrix[2], x, normal[x])
om.MScriptUtil.setDoubleArray(matrix[3], x, pos[x])
outMatrixes.append(matrix)
#print '--- ---' , mit.index()
pass
mit.next()
###
### test in pymel
pmatrix = pm.dt.Matrix(outMatrixes[i])
ll = pm.spaceLocator()
pm.xform(ll,ws = 1 , m = pmatrix)
åš 2018å¹Ž11æ21æ¥ææäž UTC+8äžå2:19:04ïŒZhen HuangåéïŒ

Post by Angelo Sta. Catalina
I recommend you get Chad Vernon's "Applied 3d Math" video tutorial
found here
<https://www.cgcircuit.com/course/applied-3d-math?affid=084fa76a5ad4e37ee02f0fb98fd229b4ed900c0c1aea6f5ba4e330927a0d65f606af5a9ebad4b731f8b6036fa27758765636bec02ae95f3f30765a390979b9c6>
.
It goes over how to construct rotation from 3 points (basically a rivet).

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate

using connected points.

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Angelo Sta. Catalina

2018-11-24 15:30:12 UTC

Permalink

Did you do that test with a python plugin? It will always be slower then
Maya's method. Also, rivets aren't GPU friendly so things are a lot slower

Post by zhen huang
Hi ,
I've done for the custom follicle , and found the speed is much slower
than maya follicle .
points orthonormal coordinate . The inputs is 5 , index of A,B,C point and
UV , so sad even this simple pure math function can't run faster than maya
follicle ,
the frame rate of 3 points method is around 16 fps with 1000 rivets , (I
just did crossing from BA and CA , define the U from A to BC , define V
from AB to BC , to have the tangent and position , basic simple math
operation ).
and maya follicle in same number is around 60 fps
What a terrible result that I've done all I can do , please help and
discuss if you got anything about this topic .
Thanks ,
åš 2018å¹Ž11æ21æ¥ææäž UTC+8äžå11:52:04ïŒzhen huangåéïŒ

Post by Angelo Sta. Catalina
I recommend you get Chad Vernon's "Applied 3d Math" video tutorial
found here
<https://www.cgcircuit.com/course/applied-3d-math?affid=084fa76a5ad4e37ee02f0fb98fd229b4ed900c0c1aea6f5ba4e330927a0d65f606af5a9ebad4b731f8b6036fa27758765636bec02ae95f3f30765a390979b9c6>
.
It goes over how to construct rotation from 3 points (basically a rivet).

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate

using connected points.

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zhen huang

2018-11-25 01:46:47 UTC

Permalink

I test with C++ plugin , I think maya follicle is so great when I had this
test .

åš 2018å¹Ž11æ24æ¥ææå UTC+8äžå11:30:27ïŒAngeloåéïŒ

Post by Angelo Sta. Catalina
Did you do that test with a python plugin? It will always be slower then
Maya's method. Also, rivets aren't GPU friendly so things are a lot slower

Post by zhen huang
Hey , before going to C++ I wrote a python script to verify , it works
great , the behavior totally same as maya default follicle .
[image: 02.png][image: 03.png][image: 01.png]
As you can see , I test with 2 poly cubes with same manually tweaked UV
, the method works both hard edge and soft edge . Post the script below
just a feedback of this subject.
Currently not sure the speed yet , cos it hasn't been converted to C++ .
Will have a final feedback about this method . Thanks !
import maya.OpenMaya as om
import pymel.core as pm
selectionList = om.MSelectionList()
selectionList.add(node)
pathNode = om.MDagPath()
selectionList.getDagPath(0, pathNode)
return pathNode
###### inputs
meshShape = 'pCubeShape1'
#uv = [0.415 , 0.495]
uvs = [(0.415,0.495) , (0.339 , 0.535)]
### use pymel to get api function and dag path
#pmm = pm.PyNode('pCubeShape1')
#dag = pmm.__apimdagpath__()
#fm = pmm.__apimfn__()
### use api to get function and dag path
dag = getDagPath(meshShape)
fm = om.MFnMesh(dag)
###### compute start
###
util2 = om.MScriptUtil()
### define normal tangents
normal = om.MVector()
uTangent = om.MVector()
vTangent = om.MVector()
### define pos MPoint
pos = om.MPoint(0.0,0.0,0.0)
### walk through meshPolygon , try to just walk through just one time
for multiply inputs to save calculation time
faceIndex = -1
mit = om.MItMeshPolygon(dag)
outMatrixes = om.MMatrixArray()
util2.createFromList(uv , 2)
float2ParamUV = util2.asFloat2Ptr()
mit.getAxisAtUV(normal,uTangent , vTangent , float2ParamUV)
mit.getPointAtUV(pos,float2ParamUV)
#print '+++ +++' , mit.index()
#print list(normal) , list(uTangent) , list(vTangent) , list(pos)
faceIndex = mit.index()
### start to build matrix
normal.normalize()
### get none shear tangents
newVTangent = uTangent ^ normal
newUTangent = normal ^ newVTangent
newVTangent.normalize()
newUTangent.normalize()
newUTangent = newUTangent*-1
###### output , return matrixices and faceIndex
### write om matrix , can change axis order here
matrix = om.MMatrix()
om.MScriptUtil.setDoubleArray(matrix[0], x, newUTangent[x])
om.MScriptUtil.setDoubleArray(matrix[1], x, newVTangent[x])
om.MScriptUtil.setDoubleArray(matrix[2], x, normal[x])
om.MScriptUtil.setDoubleArray(matrix[3], x, pos[x])
outMatrixes.append(matrix)
#print '--- ---' , mit.index()
pass
mit.next()
###
### test in pymel
pmatrix = pm.dt.Matrix(outMatrixes[i])
ll = pm.spaceLocator()
pm.xform(ll,ws = 1 , m = pmatrix)
åš 2018å¹Ž11æ21æ¥ææäž UTC+8äžå2:19:04ïŒZhen HuangåéïŒ

Post by Zhen Huang
Thanks Michael , I found a api function to have the correctly normal
and tangents depends on UV directions which called
MItMeshPolygon.getAxisAtUV , perfectly matched follicle's behavior , will
post out soon .
åš 2018å¹Ž11æ21æ¥ææäž UTC+8äžå11:54:23ïŒMichael BoonåéïŒ

Post by Angelo Sta. Catalina
I recommend you get Chad Vernon's "Applied 3d Math" video tutorial
found here
<https://www.cgcircuit.com/course/applied-3d-math?affid=084fa76a5ad4e37ee02f0fb98fd229b4ed900c0c1aea6f5ba4e330927a0d65f606af5a9ebad4b731f8b6036fa27758765636bec02ae95f3f30765a390979b9c6>
.
It goes over how to construct rotation from 3 points (basically a rivet).

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate

using connected points.

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Zhen Huang

2018-11-21 06:14:36 UTC

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Hi Angelo ,

Thanks ! Awesome turorial , I'm going to use this solution after follicle
style method , seems ti's a pure math method base on triangle shape ,
should be a faster solution .

åš 2018å¹Ž11æ20æ¥ææäº UTC+8äžå9:54:52ïŒAngeloåéïŒ

Why not just use MFnMesh.getPoint? Build an orthonormal coordinate using

connected points.

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