Hi, I'd like to present you a simple script.
It let you automatically select all UV borders and break their Phong shading, that might be useful for game modeling, especially with hardsurface props.
More info about hard edges - http://www.polycount.com/forum/showthread.php?t=107196

Unfortunately, the 'Texture View' window must be opened at least once for properly work
Just close 'Texture View' and continue work.

Video: https://vimeo.com/317072443

Download link: https://github.com/rocketjump4d/UV2PhongEdges

I've wrote it by myself
Its presentation is here: https://plugincafe.maxon.net/topic/11336/script-harden-edges-of-all-uv-borders-break-phong-shading
May be it'll be useful for someone
Cheers

Hello guys,
I rewritten script UV2PhongEdges (weird name, I know :D) from scratch. Now it should works much faster. Also UNDO finally works, yyyeeeey!

You can download it here
https://github.com/rocketjump4d/UV2PhongEdges

And here is an example
https://vimeo.com/447775062

Also, if you just need to get edges indexes of all UV borders you can use this code:

import c4d
from c4d import utils

def GetUVBorders(obj):
    edgesIndexes = set()
    abcd = tuple("abcd")

    tuvw = obj.GetTag(c4d.Tuvw)
    nbr = utils.Neighbor()
    nbr.Init(obj)

    # Create empty set for `edgesVV`
    # In this case `edgeVV` means `Edge between Vertex0 and Vertex1 (edgeVertexVertex)`
    # edgeVV is just a tuple(v0, v1), where v0 is index of the first vertex
    # and v1 is the second one
    allEdgesVV = set()

    for i in xrange(obj.GetPointCount()):
        # Find neighbor vertex for this one
        neighborIndexes = nbr.GetPointOneRingPoints(i)

        for ni in neighborIndexes:
            edgeTuple = (i, ni)
            allEdgesVV.add(edgeTuple)

    # At this point I've got a set of all `edgesVV` of the object
    # Something like this:
    # (0, 3)
    # (0, 5)
    # (5, 1)

    for edgeVV in allEdgesVV:
        # Find neighbour polygons for this edge
        # I called them polyA and polyB
        polyAIndex, polyBIndex = nbr.GetEdgePolys(edgeVV[0], edgeVV[1])
        polyA = obj.GetPolygon(polyAIndex)

        if polyBIndex is c4d.NOTOK:
            # There is no polyB. It means that this edge is border of the object

            # eiA stands for `Edge Index in polyA for current edgeVV`
            eiA = polyAIndex * 4 + polyA.FindEdge(edgeVV[0], edgeVV[1])
            edgesIndexes.add(eiA)
            continue

        polyB = obj.GetPolygon(polyBIndex)

        # piA0 stands for `Point Index in polyA for vertex edgeVV[0]`
        # the same for others
        piA0 = polyA.Find(edgeVV[0])
        piA1 = polyA.Find(edgeVV[1])
        piB0 = polyB.Find(edgeVV[0])
        piB1 = polyB.Find(edgeVV[1])

        # Replace "d" (3) to "c" (2) if polygon is triangle
        if polyA.IsTriangle() and piA0 == 3:
            piA0 = 2
        if polyA.IsTriangle() and piA1 == 3:
            piA1 = 2
        if polyB.IsTriangle() and piB0 == 3:
            piB0 = 2
        if polyB.IsTriangle() and piB1 == 3:
            piB1 = 2

        # Get UV coordinates for each point in each polygon
        uvCoordA0 = tuvw.GetSlow(polyAIndex)[abcd[piA0]]
        uvCoordA1 = tuvw.GetSlow(polyAIndex)[abcd[piA1]]
        uvCoordB0 = tuvw.GetSlow(polyBIndex)[abcd[piB0]]
        uvCoordB1 = tuvw.GetSlow(polyBIndex)[abcd[piB1]]

        if uvCoordA0 != uvCoordB0 or uvCoordA1 != uvCoordB1:
            eiA = polyAIndex * 4 + polyA.FindEdge(edgeVV[0], edgeVV[1])
            eiB = polyBIndex * 4 + polyB.FindEdge(edgeVV[0], edgeVV[1])
            edgesIndexes.add(eiA)
            edgesIndexes.add(eiB)

    return edgesIndexes

Let me know if you find bugs.
Btw, sorry any mistakes. My English is... meh

@m_magalhaes
Got it, thanks

Hi, I've just tested this script in R23. It doesn't work
One of my own scripts cannot work without this function.
Guys, you're really awesome! I love C4D, and hope you can fix it

May be I can help somehow? I can upload the example scene, if you need it.

Hello guys,
I rewritten script UV2PhongEdges (weird name, I know :D) from scratch. Now it should works much faster. Also UNDO finally works, yyyeeeey!

You can download it here
https://github.com/rocketjump4d/UV2PhongEdges

And here is an example
https://vimeo.com/447775062

Also, if you just need to get edges indexes of all UV borders you can use this code:

import c4d
from c4d import utils

def GetUVBorders(obj):
    edgesIndexes = set()
    abcd = tuple("abcd")

    tuvw = obj.GetTag(c4d.Tuvw)
    nbr = utils.Neighbor()
    nbr.Init(obj)

    # Create empty set for `edgesVV`
    # In this case `edgeVV` means `Edge between Vertex0 and Vertex1 (edgeVertexVertex)`
    # edgeVV is just a tuple(v0, v1), where v0 is index of the first vertex
    # and v1 is the second one
    allEdgesVV = set()

    for i in xrange(obj.GetPointCount()):
        # Find neighbor vertex for this one
        neighborIndexes = nbr.GetPointOneRingPoints(i)

        for ni in neighborIndexes:
            edgeTuple = (i, ni)
            allEdgesVV.add(edgeTuple)

    # At this point I've got a set of all `edgesVV` of the object
    # Something like this:
    # (0, 3)
    # (0, 5)
    # (5, 1)

    for edgeVV in allEdgesVV:
        # Find neighbour polygons for this edge
        # I called them polyA and polyB
        polyAIndex, polyBIndex = nbr.GetEdgePolys(edgeVV[0], edgeVV[1])
        polyA = obj.GetPolygon(polyAIndex)

        if polyBIndex is c4d.NOTOK:
            # There is no polyB. It means that this edge is border of the object

            # eiA stands for `Edge Index in polyA for current edgeVV`
            eiA = polyAIndex * 4 + polyA.FindEdge(edgeVV[0], edgeVV[1])
            edgesIndexes.add(eiA)
            continue

        polyB = obj.GetPolygon(polyBIndex)

        # piA0 stands for `Point Index in polyA for vertex edgeVV[0]`
        # the same for others
        piA0 = polyA.Find(edgeVV[0])
        piA1 = polyA.Find(edgeVV[1])
        piB0 = polyB.Find(edgeVV[0])
        piB1 = polyB.Find(edgeVV[1])

        # Replace "d" (3) to "c" (2) if polygon is triangle
        if polyA.IsTriangle() and piA0 == 3:
            piA0 = 2
        if polyA.IsTriangle() and piA1 == 3:
            piA1 = 2
        if polyB.IsTriangle() and piB0 == 3:
            piB0 = 2
        if polyB.IsTriangle() and piB1 == 3:
            piB1 = 2

        # Get UV coordinates for each point in each polygon
        uvCoordA0 = tuvw.GetSlow(polyAIndex)[abcd[piA0]]
        uvCoordA1 = tuvw.GetSlow(polyAIndex)[abcd[piA1]]
        uvCoordB0 = tuvw.GetSlow(polyBIndex)[abcd[piB0]]
        uvCoordB1 = tuvw.GetSlow(polyBIndex)[abcd[piB1]]

        if uvCoordA0 != uvCoordB0 or uvCoordA1 != uvCoordB1:
            eiA = polyAIndex * 4 + polyA.FindEdge(edgeVV[0], edgeVV[1])
            eiB = polyBIndex * 4 + polyB.FindEdge(edgeVV[0], edgeVV[1])
            edgesIndexes.add(eiA)
            edgesIndexes.add(eiB)

    return edgesIndexes

Let me know if you find bugs.
Btw, sorry any mistakes. My English is... meh

Hello guys,
It's something weird with MCOMMAND_MIRROR in S22.

This script (thanks to m_adam) duplicates and mirrors the object.

import c4d


def main():
    # Checks if selected object is valid
    if op is None:
        raise ValueError("op is none, please select one object.")

    # Defines some general settings, take care MDATA_MIRROR_VALUE, MDATA_MIRROR_SYSTEM and MDATA_MIRROR_PLANE
    settings = c4d.BaseContainer()
    settings[c4d.MDATA_MIRROR_DUPLICATE] = True
    settings[c4d.MDATA_MIRROR_SELECTIONS] = True
    settings[c4d.MDATA_MIRROR_ONPLANE] = True
    settings[c4d.MDATA_MIRROR_WELD] = True
    settings[c4d.MDATA_MIRROR_TOLERANCE] = 0.01

    # Corresponds to MDATA_MIRROR_VALUE, MDATA_MIRROR_SYSTEM and MDATA_MIRROR_PLANE
    value = 1000.0
    system = 0 # 0 = Object, 1 = World
    plane = 1 # 0 = XY, 1 = ZY, 2 = XZ

    if not 0 <= system < 2:
        raise ValueError("System can only be 0 or 1")

    # Buffer position vector
    pos = c4d.Vector()

    # Calculates Local (Object) coordinates
    if system == 0:
        globalMatrix = op.GetMg()
        if plane == 0:
            pos = globalMatrix.v3
        elif plane == 1:
            pos = globalMatrix.v1
        elif plane == 2:
            pos = globalMatrix.v2

        settings[c4d.MDATA_MIRROR_POINT] = globalMatrix.off + pos * value
        settings[c4d.MDATA_MIRROR_VECTOR] = pos

    # Calculates World coordinates
    elif system == 1:
        if plane == 0:
            pos = c4d.Vector(0.0, 0.0, 1.0)
        elif plane == 1:
            pos = c4d.Vector(1.0, 0.0, 0.0)
        elif plane == 2:
            pos = c4d.Vector(0.0, 1.0, 0.0)

        settings[c4d.MDATA_MIRROR_POINT] = pos * value
        settings[c4d.MDATA_MIRROR_VECTOR] = pos

    # Send the Modeling Operation
    res = c4d.utils.SendModelingCommand(c4d.MCOMMAND_MIRROR,
                                        [op],
                                        c4d.MODELINGCOMMANDMODE_ALL,
                                        settings,
                                        doc)

    c4d.EventAdd()


if __name__ == "__main__":
    main()

However, if I change

settings[c4d.MDATA_MIRROR_DUPLICATE] = True

to

settings[c4d.MDATA_MIRROR_DUPLICATE] = False

Script doesn't make anything.
In R20 it works.
Is it ok? Is there any way to just mirror the object without duplicate it?

P.S. Also, if I use Mirror (https://help.maxon.net/index.html#5633) with unchecked Duplicate Points everything works (in S22).

Cinema 4D S22.118 Windows 10

Hi @m_adam
Thank you for your reply. It works perfectly!

Hi there, I'm trying to mirror object via SendModelingCommand(c4d.MCOMMAND_MIRROR, ..)
But I cann't understand how to change a coordinate system.
According to the documentation this options is called MDATA_MIRROR_SYSTEM and it's int type.
Its description says Coordinate system. (See dialog.)
I believe it is the dialog:

It seems like 0 means Object, 1 - World, 2 - Screen.
I tried different values from 0 to 30, but it didn't take any effect.

The code I'm using:

settings = c4d.BaseContainer()
settings[c4d.MDATA_MIRROR_SYSTEM] = 0

res = utils.SendModelingCommand(c4d.MCOMMAND_MIRROR,
                          [obj],
                          c4d.MODELINGCOMMANDMODE_ALL,
                          settings,
                          doc)

I cannot change MDATA_MIRROR_PLANE either.
There is no additional information in the documentation.
Drag'n'drop for these fields doesn't work. It's strange, because it works perfectly for other tools.

I found this post (from 2011) https://plugincafe.maxon.net/topic/5497/5516_mirror-tool-bug
It seems that bug is still alive

Version: R20
Platform: Windows

Cheers

Hi everyone!

When C4D is in Polygon mode Grow selection can be done using SendModelingCommand e.g.

utils.SendModelingCommand(
        c4d.MCOMMAND_SELECTGROW,
        [op],
        c4d.MODELINGCOMMANDMODE_POLYGONSELECTION,
        c4d.BaseContainer(),
        doc
    )

After that, selection grows to neighbour polygons. Everithing is ok.
However, when active mode is UV Polygon then code above select neighbour polygons the same way how it was in previous case. Sometime it's ok, but not always.

The second way to grow selection is to use CallCommand

c4d.CallCommand(12558, 12558) # Grow Selection

In this case selection grows correctly in both modes.
I'll show an example. There is a simple sphere that separated by UVs in the middle. So it has 2 UV islands.

From 1 selected polygon (the first image) I want to get the result which is shown on the last image.
But I don't know how to get it without CallCommand
Sorry for mistakes. English is not my szcznek language
Cheers

Thank you very much guys!
I think that plugin will be better solution then script in this case.
Cheers

Hi @mp5gosu, thank you for your feedback!
Yep, it has Undo problem. I assume, it's because the script uses CallCommand. And there are 2 places where I still don't understand how to avoid this

the selection should be restored after the process
Thank you for this remark. I'm gonna fix it asap.
Cheers.

EDIT: I've fixed the script. Now it restores the selection after the process.

I've wrote it by myself
Its presentation is here: https://plugincafe.maxon.net/topic/11336/script-harden-edges-of-all-uv-borders-break-phong-shading
May be it'll be useful for someone
Cheers