Sometimes after my computer has been turned on long enough I am no longer able to open up C4D. It gets stuck on: "loading plugins" and when I run c4d with the argument "g_console=true" I get this output:

Application start      : 06/06/22 at 13:43:12
Executable             : 64 Bit
Version / Build        : 19.068 / RB245443
Debugger               : not available
Memory model           : release
Startup path           : file:///C:/PFxBOB/Cinema 4D R19
Application path       : file:///C:/PFxBOB/Cinema 4D R19/CINEMA 4D.exe
Application executable : file:///C:/PFxBOB/Cinema 4D R19/CINEMA 4D.exe
Resource path          : file:///C:/PFxBOB/Cinema 4D R19/resource
Module path(s)         : file:///C:/PFxBOB/Cinema 4D R19/corelibs
Temporary path         : file:///C:/Users/BOB/AppData/Local/Temp
Prefs path             : file:///C:/Users/BOB/AppData/Roaming/MAXON/Cinema 4D R19_2561E711
Global Prefs path      : file:///C:/Users/BOB/AppData/Roaming/MAXON
OS version             : Windows 10, 64 Bit, Unknown Edition (125) (build 14393)
Processor              : 8(16)x Intel Core i7-5960X CPU
Computer name          : BOB-MACHINE
Thread Count           : 16
Cpu Speed (MHz)        : 3010.000
Application Type       : Modular
Command line arguments : "g_console=true"

Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/browser.xdl64 with module(s) net.maxon.c4d.browser
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/c4dplugin.xdl64 with module(s) net.maxon.c4dplugin net.maxon.c4d.c4dplugin
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/crashhandler.module.xdl64 with module(s) net.maxon.crashhandler
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/crypt.module.xdl64 with module(s) net.maxon.crypt
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/drawport.module.xdl64 with module(s) net.maxon.drawport
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/drawport_general.module.xdl64 with module(s) net.maxon.drawport_general
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/drawport_opengl.module.xdl64 with module(s) net.maxon.drawport_opengl
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/drawport_selector.module.xdl64 with module(s) net.maxon.drawport_selector
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/embree.module.xdl64 with module(s) net.maxon.embree
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/geom.module.xdl64 with module(s) net.maxon.geom
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/gui.module.xdl64 with module(s) net.maxon.gui
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/image.module.xdl64 with module(s) net.maxon.image
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/image_openexr.module.xdl64 with module(s) net.maxon.image_openexr
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/image_winmf.module.xdl64 with module(s) net.maxon.image_winmf
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/io_obj.xdl64 with module(s) net.maxon.c4d.io_obj
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/math.module.xdl64 with module(s) net.maxon.math
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/mesh.module.xdl64 with module(s) net.maxon.mesh
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/misc.module.xdl64 with module(s) net.maxon.misc
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/mkmodeler.xdl64 with module(s) net.maxon.c4d.mkmodeler
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/network.module.xdl64 with module(s) net.maxon.network
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/opencl.module.xdl64 with module(s) net.maxon.opencl
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/opensubdiv.module.xdl64 with module(s) net.maxon.opensubdiv
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/render.module.xdl64 with module(s) net.maxon.render
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/shaderbase.module.xdl64 with module(s) net.maxon.shaderbase
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/tessellation.module.xdl64 with module(s) net.maxon.tessellation
Loading file:///C:/PFxBOB/Cinema 4D R19/corelibs/xtensions.xdl64 with module(s) net.maxon.c4d.xtensions

OpenGL root context initialized
    Vendor        : NVIDIA Corporation (NVIDIA)
    Renderer      : GeForce GTX 970/PCIe/SSE2
    OpenGL version: 4.6.0 NVIDIA 457.09
    Driver version: 457.09
OpenGL root context initialized
    Vendor        : VMware, Inc. (VMWARE)
    Renderer      : Gallium 0.4 on llvmpipe (LLVM 4.0, 256 bits)
    OpenGL version: 3.3 (Core Profile) Mesa 17.0.1 (git-)
    Driver version: 17.0.1 (git-)
ZeroConf error: Couldn't get bonjour version [sys_bonjour.cpp(1725)]

Any idea on how to fix this without restarting the computer? It usually works after restarting. I'm not sure if it's related to a specific plugin given where it's getting stuck, but I'm not sure. Any ideas on how to debug this?

I’m trying to render an animation from the commandline but it fails because an “asset is missing”. What’s interesting is that the asset in reference is from the “Studio.lib4d” file located in the “library/browser” subfolder of the Cinema 4D R19 installation directory. I used a material from that preset library in the animation, but it renders fine in the GUI version of C4D, so I don’t understand why it is missing from the commandline version. Here’s my example command:

&"C:\PFxPK2\Cinema 4D R19\Commandline.exe" -render "\\networkdrive\myfolder\heart.c4d"

and here’s the output:

How do I get the commandline version of C4D to recognize the .lib4d library files in the library/browser folder?

@m_magalhaes This worked great, thank you.

I want to change the value of a parameter and then export a .gltf file in C4D R23, and do this over and over again for many values. I'm trying to do it with this code, but it is not working:

import c4d
from c4d import documents, plugins
import c4d.documents as docs

def main():
    for ii in range(882):
        obj = doc.SearchObject("Selector")
        obj[c4d.ID_USERDATA,1] = ii
        docs.SaveDocument(c4d.documents.GetActiveDocument(), f'out{ii}.gltf', c4d.SAVEDOCUMENTFLAGS_DONTADDTORECENTLIST, format=c4d.FORMAT_GLTFEXPORT)
        c4d.EventAdd()



if __name__=='__main__':
    main()

Unfortunately, I get this error:

How do I fix this? I think I need to specify the gltf export settings somehow, but I don't know how to do this.

@ferdinand Thank you, your example worked great. Now I understand how to use those symbols. Lowering the the degrees from 5 to 1 solved the issue. Thanks!

Example for anyone curious:

spline = c4d.SplineObject(total_points, c4d.SPLINETYPE_CUBIC)
    
    spline[c4d.SPLINEOBJECT_INTERPOLATION] = c4d.SPLINEOBJECT_INTERPOLATION_ADAPTIVE
    spline[c4d.SPLINEOBJECT_ANGLE] = c4d.utils.DegToRad(1.)

Basically, what I'm looking to do is increase the number of intermediate points. It seems like the default is to use "Adaptive" with an angle of 5 degrees. However, I would prefer for it to be lower (such as one degree), but I don't see any documentation on the SplineObject page on how to do this with the Python generator. Any ideas?

I found this page here, but I don't understand how to use that with the SplineObject.

I am using a Python generator to create a spline, and I set the interpolation to cubic. However, when the points of the spline are spread out enough, even with the cubic interpolation, it looks more like piecewise linear when getting closer. To it. Look at this video showing what I'm observing:

https://www.youtube.com/watch?v=_rNVelCUdxE

As you can see, it is certainly smoother than when I set the interpolation to linear, but even when it is cubic, when I zoom in enough, it still looks somewhat jagged, enough to be noticeable. At the end of the video I circle the cursor around the joints on the cubic spline.

Is there some way I can make the cubic interpolation smoother? I would prefer that the cubic interpolation splines doesn't look like a bunch of connected straight line segments.

@ferdinand Your flat UV projection solution worked great! Although I had to change the y to z and subtract the z range mappings from 1 in order to get it to work correctly. I will include a download in case anybody wants to see the details.

Now I just have a few more questions:

1. When in the viewport, the Python "complexShader" plugin I provided code for above just renders as black (see the right two of this image):

But it works when I render it:

Is there any way to get the Python shader to work in the viewport (not be completely black)? Or is it just too slow for that?

2. The Python shader is very slow to render. If I were to write the shader in C++ and compile it, would you expect a significant speedup? The code would be nearly identical to what I have in the Python "complexShader" code I presented above, but C++ obviously and instead of using Python's "cmath" module I would be using C++'s "std::complex". Would this render noticeably quicker than doing it in Python?

3. If I wrote a plugin in C++ to generate the geometry instead of doing it in Python, would you expect a significant speedup? I'm thinking so just because, from personal experience, I know nested for loops in Python are quite slow. The code I have written above slows down fast as the "resolution" variable increases. But I'm curious to hear your thoughts.

@m_magalhaes

It seems like there must be more to it or I'm doing something wrong. I added the following right above the return node line of code in the Python generator:

uvwTag = node.MakeVariableTag(c4d.Tuvw, poly_count)
c4d.EventAdd()
for ii in range(poly_count):
    q = ii/poly_count
    uvwTag.SetSlow(ii, c4d.Vector(q,q,0), c4d.Vector(q,q,0), c4d.Vector(q,q,0), c4d.Vector(q,q,0))

But I'm still getting the red error color. I also have the Python plugin print "hi" when it errors, and it is printing "hi". I haven't done the math to correctly set the values for the UV coordinates yet (that "q" number is just a placeholder/test to see if it errors, and it does).

Regardless of what I set the UVW coordinates to be at each point, I shouldn't be getting the error color. So do you know what I'm missing?

@m_magalhaes Thank you, that Python fresnel example was extremely helpful. I got very close with the following:

import os
import math
import cmath

import c4d
from c4d import plugins, bitmaps, utils

#warning Please obtain your own plugin ID from http://www.plugincafe.com # I didn't
PLUGIN_ID=1027090

class complexShader(plugins.ShaderData):
    
    def __init__(self):
        #if a Python exception occurs during the calculation of a pixel colorize this one in red for debugging purposes
        self.SetExceptionColor(c4d.Vector(1,0,0))
    
    def Output(self, sh, cd):
        if cd.vd: #if shader is computated in 3d space
            pi = math.pi
            
            u = cd.p[0]
            v = cd.p[1]
            tt = cd.t # /28.0
            osc = math.sin(2*pi*tt)
            
            min_y = -2*pi
            max_y = 2*pi
            min_x = -2*pi
            max_x = 2*pi
            
            # to view correctly when applied to a plane in c4d, have x axis pointing right, z axis pointing up, and y axis pointing at the camera
            x = c4d.utils.RangeMap(u, 0, 1, min_x, max_x, clampval = True)
            y = c4d.utils.RangeMap(1-v, 0, 1, min_y, max_y, clampval = True)
            z = x + y*1j
            
            out = cmath.exp(z)
            
            angle = cmath.phase(out)/pi % 2.0 # wrap it at pi to match Mathematica's color mapping (mathematica: -pi = cyan, 0 = red, pi = cyan)
            hue = c4d.utils.RangeMap(angle, 0.0, 2.0, 0, 1, clampval = True)
            colorHSV = c4d.Vector(hue, 1.0, 1.0)
            colorRGB = c4d.utils.HSVToRGB(colorHSV)
            
            return c4d.Vector(colorRGB[0],colorRGB[1],colorRGB[2])
        else: #if shader is computated in 2d space
            return c4d.Vector(0.0)
    
    def FreeRender(self, sh):
        #Free any resources used for the precalculated data from InitRender().
        return

def RegisterComplexShader():
    IDS_COMPLEX_SHADER=10001 #string resource, must be manually defined
    return plugins.RegisterShaderPlugin(PLUGIN_ID, plugins.GeLoadString(IDS_COMPLEX_SHADER), 0, complexShader, "", 0)

if __name__=='__main__':
    RegisterComplexShader()

This works on a plane. However, when I apply the same material to the Python generator, it returns the error color (red):

I'm assuming this is because the geometry generated in the Python generator doesn't have UVs. Is that correct? If so, what is the proper way to add them? If not, why does it work on the plane but not the Python generator (which contains the same code as my first post).

Here's the sample .c4d file and the .pyp plugin in case anybody wants to test it for themselves. I was testing this on R19:
https://drive.google.com/file/d/1UJAsaYsEdKJKwafTau8-LDkLETSzgRNW/view?usp=sharing