如何让PyCollada输出多个网格到同一场景？

Question

所以我使用pyCollada尝试将多个网格导出到相同的场景。唉，每当我尝试这样做，我只能看到我已加载的网格之一。我创建文件时做错了什么？如果我将它们分隔到自己的文件中，每个单独的网格都完美呈现，但当我尝试将它们输出到同一文件时，它们会失败。我已经浏览了API，但文档非常有限。任何帮助，将不胜感激。

我的代码如下所示。

# -*- coding: utf-8 -*- 
""" 
Created on Fri Jun 12 14:43:05 2015 

@author: skylion 
""" 

# -*- coding: utf-8 -*- 

""" 

Created on Thu Jun 11 11:01:48 2015 


@author: danaukes 

""" 


import sys 
import popupcad_deprecated 
import popupcad_manufacturing_plugins 
import popupcad 

from popupcad.filetypes.design import Design 

import PySide.QtGui as qg 


#Draws Collada stuff 
from collada import * 
import numpy 

geom_index = 0; 

def exportBodyToMesh(output): 
# csg = output.csg  
    generic = output.generic_laminate() 
# layers = generic.layers() 
    layerdef = d.return_layer_definition() 
    layerdef.refreshzvalues() 
# layers = layerdef.layers 
    mesh = Collada() 
    nodes = [] 
    for layer in layerdef.layers: 
     shapes = generic.geoms[layer]#TODO Add it in for other shapes   
     zvalue = layerdef.zvalue[layer]   
     height = zvalue * 1/ popupcad.internal_argument_scaling 
     print zvalue 
     if (len(shapes) == 0) : #In case there are no shapes. 
      print "No shapes skipping"    
      continue 
     print shapes 
     for s in shapes: 
      geom = createMeshFromShape(s, height, mesh) 
      mesh.geometries.append(geom) 
     effect = material.Effect("effect" + str(geom_index), [], "phone", diffuse=(1,0,0), specular=(0,1,0)) 
     mat = material.Material("material" + str(geom_index), "mymaterial", effect)  
     matnode = scene.MaterialNode("materialref" + str(geom_index), mat, inputs=[]) 
     mesh.effects.append(effect) 
     mesh.materials.append(mat) 
     geomnode = scene.GeometryNode(geom, [matnode]) 
     node = scene.Node("node" + str(geom_index), children=[geomnode])  
     nodes.append(node) 
    print nodes 
    myscene = scene.Scene("myscene", nodes) 
    mesh.scenes.append(myscene) 
    mesh.scene = myscene 
# layer_num = layer_num + 1 #Add the layer thicknes instead of simply + 1  
    filename = str(output) + '.dae' 
    mesh.write(filename) 
    #TODO Add handling in case rigid body has already been selected. 
    print filename + " has been saved" 


def createMeshFromShape(s,layer_num, mesh):  
    s.exteriorpoints() 
    a = s.triangles3() 
    vertices = [] 
    global geom_index 
    for coord in a: 
     for dec in coord: 
      vertices.append(dec[0]) #x-axis 
      vertices.append(dec[1]) #y-axis 
      vertices.append(layer_num) #z-axi 

    #This scales the verticies properly. 
    vert_floats = [x/popupcad.internal_argument_scaling for x in vertices] 
    vert_src = source.FloatSource("cubeverts-array" + str(geom_index), numpy.array(vert_floats), ('X', 'Y', 'Z')) 
    geom = geometry.Geometry(mesh, "geometry" + str(geom_index), "mycube", [vert_src])  
    input_list = source.InputList() 
    input_list.addInput(0, 'VERTEX', "#cubeverts-array" + str(geom_index)) 
    indices = numpy.array(range(0,(len(vertices)/3)));  
    triset = geom.createTriangleSet(indices, input_list, "materialref") 
    geom_index += 1   
    triset.generateNormals()  
    geom.primitives.append(triset) 
    return geom 

#Start of actual script 
print sys.argv 

app = qg.QApplication('exporter.py') 

d = Design.open() 

print "Loading..." 

d.reprocessoperations() 

operation = d.operations[3] #Identify bodies 

for output in operation.output: 
    exportBodyToMesh(output) 

print "All objects printed" 

#sys.exit(app.exec_()) 

Answer 1

将代码添加到场景中的代码不在内部循环中。您只将最后一个几何图形添加到场景中，而不是全部。您应该创建多个GeometryNode并将其全部添加到Scene。