This script in the xpresso python tag works fine in Cinema 4D R19 but it doesn't work in higher versions. When I click on compile it says "no errors". The script should write spline data that I use in a range mapper node. But when I connect the output ports to the range mapper spline input port both the python and the range mapper turn yellow. Does anybody have an idea why this works in older versions of Cinema 4D but not in 2025?

import c4d
import math

def main():
    global steps #number of steps
    global stepsize #size of each step
    global skidstep #spline data for range mapper
    global returnstep #spline data for range mapper

    points = steps * 2
    Xstep = 1 / points
    Ystep = 1 / steps

    points = points + 1
    skidstep = c4d.SplineData()
    skidstep.MakePointBuffer(points)
    returnstep = c4d.SplineData()
    returnstep.MakePointBuffer(points)

    X = 0
    Ya = 0
    Yb = 1
    step = 0

    while step < points:
        vec_A = c4d.Vector(X, Ya, 0)
        vec_B = c4d.Vector(X, Yb, 0)
        skidstep.SetKnot(step, vec_A)
        returnstep.SetKnot(step, vec_B)
        X = X + Xstep
        step = step + 1
        if step % 2 != 0:
            Ya = Ya + Ystep
            Yb = 0
        else:
            Yb = 1

Hi,

I stumbled upon the same problem. The script from bonsak didn't solve the problem for me.
But thanks to a tip I found a working solution.
It is possible to make a parent-child setup. But you have to change the values in the parent settings after creating the child settings.

import c4d
from c4d import gui
import redshift

def main():
    #Create main render setting
    rd = c4d.documents.RenderData()
    rd.SetName('render_group')
    rd[c4d.RDATA_RENDERENGINE] = redshift.VPrsrenderer
    rd_red = redshift.FindAddVideoPost(rd, redshift.VPrsrenderer)
    doc.InsertRenderData(rd)

    #Create child render setting
    child_setting = c4d.documents.RenderData()
    child_setting.SetName('child setting')
    child_setting[c4d.RDATA_RENDERENGINE] = redshift.VPrsrenderer
    doc.InsertRenderData(child_setting , rd)
    redshift.FindAddVideoPost(child_setting, redshift.VPrsrenderer)
    doc.InsertRenderData(child_setting , rd)

    #Change main render settings
    rd[c4d.RDATA_XRES] = 1920.0
    rd[c4d.RDATA_YRES] = 1080.0
    rd[c4d.RDATA_FRAMERATE] = 25.0
    rd[c4d.RDATA_FORMAT] = 1023671 #PNG
    rd[c4d.RDATA_FORMATDEPTH] = 1 #depth 16bit

    #Change Redshift post effect
    rd_red[c4d.REDSHIFT_RENDERER_ENABLE_AUTOMATIC_SAMPLING] = 0
    rd_red[c4d.REDSHIFT_RENDERER_UNIFIED_MIN_SAMPLES] = 32
    rd_red[c4d.REDSHIFT_RENDERER_UNIFIED_MAX_SAMPLES] = 256
    rd_red[c4d.REDSHIFT_RENDERER_MOTION_BLUR_ENABLED] = 1
    rd_red[c4d.REDSHIFT_RENDERER_COLOR_MANAGEMENT_OCIO_VIEW] = 'Un-tone-mapped'


if __name__=='__main__':
    main()