Porting addon to 2.8

mysza · September 27, 2019, 12:47pm

Hi

There is nice addon for importing MagicaVoxel project files into blender. Sadly I couldn’t find it ported to 2.8. Could anyone do this for me? Maybe it’s not a big deal, but I’m not familiar with coding at all.
Thanks

io_scene_vox.py (11.0 KB)

wizardgsz · September 27, 2019, 3:17pm

Try this and let me know please: io_scene_vox.py (11.6 KB)

Btw, I started using both Python and Blender last week, so… maybe it is totally wrong

Hear u soon!

ps. this is the original GitHub repository of the project by Richard Spencer

wizardgsz · September 27, 2019, 6:15pm

Just a tip to set “shadeless” materials, removed in 2.80; use nodes and set Emission:

            #material.use_shadeless = use_shadeless
            if use_shadeless:
                material.use_nodes = True
                material_diffuse_to_emission(material)

Add the following helpers:

import bpy

def replace_with_emission(node, node_tree):
    new_node = node_tree.nodes.new('ShaderNodeEmission')
    connected_sockets_out = []
    sock = node.inputs[0]
    if len(sock.links)>0:
        color_link = sock.links[0].from_socket
    else:
        color_link=None
    defaults_in = sock.default_value[:]

    for sock in node.outputs:
        if len(sock.links)>0:
            connected_sockets_out.append( sock.links[0].to_socket)
        else:
            connected_sockets_out.append(None)

    #print( defaults_in )

    new_node.location = (node.location.x, node.location.y)

    if color_link is not None:
        node_tree.links.new(new_node.inputs[0], color_link)
    new_node.inputs[0].default_value = defaults_in

    if connected_sockets_out[0] is not None:
        node_tree.links.new(connected_sockets_out[0], new_node.outputs[0])


def material_diffuse_to_emission(mat):

    doomed=[]
    for node in mat.node_tree.nodes:
        if node.type=='BSDF_DIFFUSE' or node.type=='BSDF_PRINCIPLED':
            replace_with_emission(node, mat.node_tree)
            doomed.append(node)
        else:
            print(node.type)

    # wait until we are done iterating and adding before we start wrecking things
    for node in doomed:
        mat.node_tree.nodes.remove(node)


def replace_on_selected_objects():
    mats = set()
    for obj in bpy.context.scene.objects:
        if obj.select_set:
            for slot in obj.material_slots:
                mats.add(slot.material)

    for mat in mats:
        material_diffuse_to_emission(mat)

def replace_in_all_materials():
    for mat in bpy.data.materials:
        material_diffuse_to_emission(mat)

References:

http://web.purplefrog.com/~thoth/blender/python-cookbook/change-diffuse-to-emission-node.html

mysza · October 4, 2019, 2:21pm

The option appears under “import”, but after chosing .vox file and clicking “import” nothing is happening

wizardgsz · October 4, 2019, 2:39pm

Thanks for your feedback.

Please, try using the updated script by the author: he released my pull request it right few hours ago!
We added “collection” handling also: when imported, you’ll have a new collection to group every voxel object.

Btw, upload your VOX file to further investigate… latest file format is not supported yet. Add this to the downloaded python script to bypass/skip new chunks:

            elif name == 'nTRN':
                vox.read(s_self)
            elif name == 'nGRP':
                vox.read(s_self)
            elif name == 'nGRP':
                vox.read(s_self)
            elif name == 'MATL':
                vox.read(s_self)
            elif name == 'LAYR':
                vox.read(s_self)
            elif name == 'rOBJ':
                vox.read(s_self)

Right before the “throw an error if unknown chunk” part:

            else:
                # Any other chunk, we don't know how to handle
                # This puts us out-of-step
                print('Unknown Chunk id {}'.format(name))
                return {'CANCELLED'}