Jvos last edited by a_block
Got a simple script that gives me errors.
First time in C4D so maybe it is a simple API call mistake, but it does not seem so.
the error is
ReferenceError: could not find 'main' in generator 'Python Generator'
My thanks for helping out, looking forward to building cool stuff in C4D
import numpy as np n = 10 y = 0 grid = np.random.choice([1, 0], n * n).reshape(10, 10) for i in range(n): for j in range(n): if grid[i, j] == 1: vec = c4d.Vector(i * 230, j * 230, y) obj = c4d.BaseObject(c4d.Ocube) # Create new cube obj.SetRelPos(c4d.Vector(vec)) # Set position of cube doc.InsertObject(obj) # Insert object in document
Cairyn last edited by
Have a look at the code template you get when you create a fresh PythonGenerator object: it contains a main() function that returns a BaseObject. You will need to do the same in your code, instead of inserting an object into the document directly (which would be the way to go in a Script but not in a Generator).
The returned object will be inserted by the C4D object tree evaluation into the rebuilt virtual hierarchy (in place of the Generator object). If you would actually insert stuff directly, you would end up with newly generated objects every time this evaluation happens.
So basically you have four issues here (unless you didn't quote the full content of the generator):
- no main() function (which gives you the error)
- no return value
- direct insertion
- no c4d import
(not sure whether you have installed NumPy even, this is not a library that comes with C4D and needs to be installed so the internal Python interpreter can find it)
Jvos last edited by
thanks for the response, make's everything a bit more clear now.
I got the numpy module in C4D. so if I want to generate multiple objects with a generator and not place the objects directly into C4D, I expected something like this quick example to work.
import c4d def main(): y = 0 for i in range(10): vec = c4d.Vector(y,230,y) obj = c4d.BaseObject(c4d.Ocube) # Create new cube obj.SetRelPos(c4d.Vector(vec)) # Set position of cube y += 100 return obj main()
why would a generator only give me 1 and not 10 cubes cloned?
chancing the return line and adding them directly into the document works, and gives me 10 cubes.
Cairyn last edited by
If you have a "return" in a "for" loop, and the return is hit in the very first pass, of course the other nine passes are skipped...
If you want to have more than one object returned, you need to link them. Try to create a null first, then loop for the 10 cubes, and attach the cubes as children of the null. Then return the null.
(No guarantee, I can't test that right now)
Jvos last edited by Jvos
ah yeah, that was a dumb mistake. Got it working now. thanks you for that., but I do still have a question.
If I want to inherit from c4d modules in my own class as a child. how would I do that? I tried it like this.
from c4d.modules.thinkingparticles.TP_MasterSystem import TP_MasterSystem class Particle(TP_MasterSystem):
but that is not how it works. :\
The import seems to work fine. but I'm not able to inherit the particle class methods like
type 'c4d.modules.thinkingparticles.TP_MasterSystem' is not an acceptable base type
a_block last edited by
first of all thanks to @Cairyn for nice explanations and helping in solving this.
@Jvos : I hope you don't mind, may I ask you to please open a new topic for unrelated topics/questions.
I have also moved this thread into the Cinema 4D Development category, added some tags and turned the thread into a question.