May pycollada be used to merge multiple collada files?

[Kang Zhao]

I have multiple parts modeled independently in collada format.  I am curious if pycollada can be used to assemble them and export as a single collada file. Any input is appreciated.

Kang

[Jeff Terrace]

Yes, you could definitely use it for that. I'm not aware of any code out there for already doing this. However, there's code in meshtool for combining multiple geometries within a single collada file. You could do something similar but across files:
https://github.com/pycollada/meshtool/blob/master/meshtool/filters/optimize_filters/combine_primitives.py

Jeff

On Sun, Mar 10, 2013 at 5:42 AM, Kang Zhao <zhaok...@gmail.com> wrote:

I have multiple parts modeled independently in collada format.  I am curious if pycollada can be used to assemble them and export as a single collada file. Any input is appreciated.

Kang

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[Kang Zhao]

Hi Jeff,

Thanks a lot for your reply. I will give a try.

Kang

[Kang Zhao]

Hi Jeff,

I guess I should share a feedback.

After some experiments, I managed to merge multiple Collada files into a single one with following simple code (with pycollada, not meshtool). With limited knowledge about Collada format and pycollada code, I am not sure if my implementation makes sense at all, but I do get the expected results in my particular application.  Any comment or suggestion is appreciated.

> cat merge_colladas.py

import collada

def merge_collada_files(list_fpath_inputs, fpath_output):
    list_collada_objects = []
    for fpath_input in list_fpath_inputs:
        list_collada_objects.append(collada.Collada(fpath_input))
    merged_collada_object = merge_collada_objects(list_collada_objects)
    merged_collada_object.write(fpath_output)

def merge_collada_objects(list_collada_objects):
   
    merged_collada_object = collada.Collada()  
    
    if len(list_collada_objects) == 0:
        return merged_collada_object
   
    merged_collada_object.assetInfo = list_collada_objects[0].assetInfo

    list_nodes_of_scene = []
    for mesh in list_collada_objects:
        merged_collada_object.effects.extend(mesh.effects)
        merged_collada_object.materials.extend(mesh.materials)
        merged_collada_object.geometries.extend(mesh.geometries)
       
        for scene in mesh.scenes:
            list_nodes_of_scene.extend(scene.nodes)         
       
    myscene = collada.scene.Scene("myscene", list_nodes_of_scene)
    merged_collada_object.scenes.append(myscene)
    merged_collada_object.scene = myscene       
           
    return merged_collada_object

# here is one example to use the above code

fpath_output = "D:\\download\\dae_examples\\merged.dae"
list_fpath_inputs = []
list_fpath_inputs.append("D:\\download\\dae_examples\\1.dae")
list_fpath_inputs.append("D:\\download\\dae_examples\\2.dae")
merge_collada_files(list_fpath_inputs, fpath_output)

Thanks,

Kang

[Jeff Terrace]

Looks pretty good to me. Glad it worked out for you,

Jeff