how to define the data structrues of the "object" in the cython

[kdsin23]

hi, i learn to write a cython code file in animation nodes,but i am trouble with cython,yesterday,i tried the way OmarEmaraDev provided,still doesn't work. for example, i want to import "object" to cython, so I add : from ...data_structrues cimport Object def getfunction(Object object): ....

when Cythonizing the .pyx file, it appering an error: 'Object' is not a type identifier,i don't know why, i need some help,Thank you very much!

[3DSinghVFX]

I think, there is no type for Object in data_structures for cimport. Can you elaborate on why do you need Object type in .pyx?

[kdsin23]

I think, there is no type for Object in data_structures for cimport. Can you elaborate on why do you need Object type in .pyx?

Thank you for your reply! for example, i want to get patilces from ParticleSystem,I maybe write a python file like this:

import bpy
from ... base_types import AnimationNode
from ... utils.depsgraph import getEvaluatedID

class ExtractParticlesNode(bpy.types.Node, AnimationNode):
    bl_idname = "an_ExtractParticlesNode"
    bl_label = "Extract Particles"

    def create(self):
        self.newInput("Object", "Object", "object")
        self.newOutput("Generic", "Particles", "particles")

    def execute(self, object):
        if object is None:
            return

        ParticleList = []
        for p in getEvaluatedID(object).active.particles:
            ParticleList.append(p)

        return ParticleList

but the speed is very slow when performace,so i tried to wirite the function "ExtractParticles()" to the cython file like this:

def ExtractParticles(Object object):
    cdef Py_ssize_t i
    cdef Py_ssize_t count = len(getEvaluatedID(object).particle_systems.active.particles)
    cdef ParticleList = list(length = count)
    for i in range(count):
        ParticleList.append(getEvaluatedID(object).particle_systems.active.particles[i])
    return ParticleList

it gave me an error: c_utils.pyx:58:21: 'Object' is not a type identifier, my question is how to import "object" data_structures,or to create a "Object" data in .pyx,thank you very much!

[3DSinghVFX]

There is no object data type in data_structures. However, your code will run even if you do not define the object type. Here is code of the Particle System from Object node: https://github.com/3DSinghVFX/animation_nodes/blob/0ed95e2c842681c81395f7477bb95f20900388fe/animation_nodes/nodes/particles/particle_systems_from_object.py#L15-L19

[kdsin23]

There is no object data type in data_structures. However, your code will run even if you do not define the object type. Here is code of the Particle System from Object node:

https://github.com/3DSinghVFX/animation_nodes/blob/0ed95e2c842681c81395f7477bb95f20900388fe/animation_nodes/nodes/particles/particle_systems_from_object.py#L15-L19

Thank you for your explanation ! but this code can not be put into the .pyxfile ,right?

[3DSinghVFX]

You can put the code in .pyx if you want. However, to get the benefits of the Cython we have to specify the types.

[kdsin23]

You can put the code in .pyx if you want. However, to get the benefits of the Cython we have to specify the types.

Thank you very much!

[3DSinghVFX]

Is it resolved?

[kdsin23]

Is it resolved?

yes,it is. thank you

[3DSinghVFX]

You're welcome.