Hello, I did a search and couldn't find much to do with materials.

My c4d version is R19

I am creating a bunch of BaseObjects inside a Python Generator and trying to shade them in various ways- which requires me to create a new material for each BaseObject.

I am successfully creating the Material instance (I think) by storing a new c4d.Material() into a new variable. However, when I run MakeTag(c4d.Ttexture) on the BaseObject and set the c4d.TEXTURETAG_MATERIAL parameter to my newly created material, it does not appear to take.

Here is my code. It uses some modata from a linked matrix object to generate a series of discs / rings.

import c4d
from c4d.modules import mograph as mo
#Welcome to the world of Python

def main():
    link = op[c4d.ID_USERDATA,1]
    size = op[c4d.ID_USERDATA,2]
    roff = op[c4d.ID_USERDATA,3]
    
    md = mo.GeGetMoData(link)
    if md is None: return False
    
    null = c4d.BaseObject(c4d.Onull)
    
    cnt = md.GetCount()
    marr = md.GetArray(c4d.MODATA_MATRIX)
    carr = md.GetArray(c4d.MODATA_COLOR)
    for i in reversed(xrange(0, cnt)):
        
        mat = c4d.Material()
        mat.SetChannelState(c4d.CHANNEL_COLOR, True)
        mat[c4d.MATERIAL_COLOR_COLOR] = carr[i]
        
        disc1 = c4d.BaseObject(c4d.Odisc)
        disc1[c4d.PRIM_DISC_ORAD] = carr[i][0] * size
        disc1[c4d.PRIM_AXIS] = 4
        disc1.SetMg(marr[i])
        disc1.InsertUnder(null)
        
        disc2 = c4d.BaseObject(c4d.Odisc)
        disc2[c4d.PRIM_DISC_IRAD] = carr[i][0] * size
        disc2[c4d.PRIM_DISC_ORAD] = carr[i][0] * size * 1.2
        disc2[c4d.PRIM_AXIS] = 4
        moff = marr[i]
        moff.off = moff.off + (roff * carr[i][0])
        disc2.SetMg(marr[i])
        ttag =  disc2.MakeTag(c4d.Ttexture)
        ttag[c4d.TEXTURETAG_MATERIAL] = mat
        disc2.InsertUnder(null)
    
    return null

Any ideas or suggestions are greatly appreciated! Thank you!

@m_adam Wow, this is truly great. What a fantastically written response, I really appreciate it! Learning a bunch from this example, way more than I asked for.

Thanks again

Jenny

P.S. if only the py4d documentation had examples like this, we would all be better programmers

I know of the C4D_Falloff and FalloffData classes, but it is a bit over my head how to utilize them within this particular application... and unfortunately there are no examples of what I'm trying to do in the documentation or anywhere online. I am writing a python modifier for sketch & toon (which means it cannot be a plugin).

More simply, I am trying to sample a MoGraph Effector's Falloff as the title states.

2 inputs:
• the Effector (BaseObject)
• point coordinate (Vector)

1 output:
• falloff reading (Float between 0.0 - 1.0)

This is something I've been wanting to be able to do for a long time in c4d python and have researched it multiple times at no avail, usually I end up resorting to roundabout setups to get things to work while in the midst of production. Thanks in advance for any leads.