blender/io_mspgl/export_object.py

   1 import os
   2 import mathutils
   3
   4 class ObjectExporter:
   5         def __init__(self):
   6                 self.show_progress = True
   7                 self.export_all = False
   8                 self.collection = False
   9                 self.shared_resources = True
  10
  11         def compute_bounding_sphere(self, obj):
  12                 p1 = max(((v.co, v.co.length) for v in obj.data.vertices), key=lambda x:x[1])[0]
  13                 p2 = max(((v.co, (v.co-p1).length) for v in obj.data.vertices), key=lambda x:x[1])[0]
  14                 center = (p1+p2)/2
  15                 radius = (p1-p2).length/2
  16                 for v in obj.data.vertices:
  17                         d = v.co-center
  18                         if d.length>radius:
  19                                 center += d*(1-radius/d.length)/2
  20                                 radius = (radius+d.length)/2
  21
  22                 return center, radius
  23
  24         def collect_object_lods(self, obj):
  25                 lods = [obj]
  26                 lods += sorted([c for c in obj.children if c.lod_for_parent], key=(lambda l: l.lod_index))
  27                 for i, l in enumerate(lods):
  28                         if i>0 and l.lod_index!=i:
  29                                 raise Exception("Inconsistent LOD indices")
  30
  31                 return lods
  32
  33         def create_mesh_exporter(self):
  34                 from .export_mesh import MeshExporter
  35                 mesh_export = MeshExporter()
  36                 return mesh_export
  37
  38         def create_material_exporter(self):
  39                 from .export_material import MaterialExporter
  40                 material_export = MaterialExporter()
  41                 return material_export
  42
  43         def create_material_atlas_exporter(self):
  44                 from .export_material import MaterialAtlasExporter
  45                 material_atlas_export = MaterialAtlasExporter()
  46                 return material_atlas_export
  47
  48         def export_to_file(self, context, out_fn):
  49                 if self.export_all:
  50                         objs = [o for o in context.selected_objects if o.type=="MESH"]
  51                 else:
  52                         objs = [context.active_object]
  53
  54                 from .util import Progress
  55                 progress = Progress(self.show_progress and context)
  56
  57                 path, base = os.path.split(out_fn)
  58                 base, ext = os.path.splitext(base)
  59
  60                 resources = {}
  61                 for i, obj in enumerate(objs):
  62                         if self.export_all:
  63                                 out_fn = os.path.join(path, obj.name+ext)
  64
  65                         progress.push_task_slice(obj.name, i, len(objs))
  66                         self.export_object_resources(context, obj, resources, None, progress)
  67
  68                         obj_res = self.export_object(context, obj, resources, progress)
  69                         refs = obj_res.collect_references()
  70                         if not self.shared_resources:
  71                                 numbers = {}
  72                                 for r in refs:
  73                                         res_ext = os.path.splitext(r.name)[1]
  74                                         n = numbers.get(res_ext, 0)
  75                                         if n>0:
  76                                                 r.name = "{}_{}{}".format(base, n, res_ext)
  77                                         else:
  78                                                 r.name = base+res_ext
  79                                         numbers[res_ext] = n+1
  80
  81                         if self.collection:
  82                                 obj_res.write_collection(out_fn)
  83                         else:
  84                                 for r in refs:
  85                                         r.write_to_file(os.path.join(path, r.name))
  86                                 obj_res.write_to_file(out_fn)
  87
  88                         progress.pop_task()
  89
  90         def export_object_resources(self, context, obj, resources, material_atlases, progress):
  91                 if material_atlases is None:
  92                         material_atlases = {}
  93
  94                 lods = self.collect_object_lods(obj)
  95
  96                 from .mesh import create_mesh_from_object
  97                 from .material import create_material_atlas
  98                 mesh_export = self.create_mesh_exporter()
  99                 material_export = self.create_material_exporter()
 100                 material_atlas_export = self.create_material_atlas_exporter()
 101
 102                 for i, l in enumerate(lods):
 103                         lod_index = l.lod_index if l.lod_for_parent else 0
 104                         progress.push_task_slice("LOD {}".format(lod_index), i, len(lods))
 105
 106                         material_atlas = None
 107                         atlas_flags = [m.render_mode!='EXTERNAL' and m.material_atlas for m in l.data.materials if m]
 108                         if any(atlas_flags):
 109                                 mmk = lambda m: m.shader if m.render_mode=='CUSTOM' else ""
 110                                 material_atlas_key = mmk(l.data.materials[0])
 111                                 key_mismatch = any(mmk(m)!=material_atlas_key for m in l.data.materials)
 112                                 if not all(atlas_flags) or key_mismatch:
 113                                         raise Exception("Conflicting settings in object materials")
 114
 115                                 if material_atlas_key in material_atlases:
 116                                         material_atlas = material_atlases[material_atlas_key]
 117                                 else:
 118                                         material_atlas = create_material_atlas(context, l.data.materials[0])
 119                                         material_atlases[material_atlas_key] = material_atlas
 120
 121                                 tech_name = "{}.tech".format(material_atlas.name)
 122                                 if tech_name not in resources:
 123                                         material_atlas_export.export_technique_resources(material_atlas, resources)
 124                                         resources[tech_name] = material_atlas_export.export_technique(material_atlas, resources)
 125                         elif l.material_slots and l.material_slots[0].material:
 126                                 material = l.material_slots[0].material
 127                                 if material.render_mode!='EXTERNAL':
 128                                         tech_name = material.name+".tech"
 129                                         if tech_name not in resources:
 130                                                 material_export.export_technique_resources(material, resources)
 131                                                 resources[tech_name] = material_export.export_technique(material, resources)
 132                         elif "stub.tech" not in resources:
 133                                 resources["stub.tech"] = self.export_stub_technique()
 134
 135                         mesh_name = l.data.name+".mesh"
 136                         if mesh_name not in resources:
 137                                 mesh = create_mesh_from_object(context, l, material_atlas, progress)
 138                                 mesh_res = mesh_export.export_mesh(context, mesh, progress)
 139                                 resources[mesh_name] = mesh_res
 140
 141                         progress.pop_task()
 142
 143         def export_object(self, context, obj, resources, progress):
 144                 if resources is None:
 145                         resources = {}
 146                         self.export_object_resources(context, obj, resources, None, progress)
 147
 148                 lods = self.collect_object_lods(obj)
 149
 150                 from .datafile import Resource, Statement
 151                 obj_res = Resource(obj.name+".object", "object")
 152                 statements = obj_res.statements
 153
 154                 center, radius = self.compute_bounding_sphere(obj)
 155                 statements.append(Statement("bounding_sphere_hint", *center, radius))
 156
 157                 prev_mesh = None
 158                 prev_tech = None
 159                 for i, l in enumerate(lods):
 160                         lod_st = []
 161
 162                         if l.data.name!=prev_mesh:
 163                                 mesh_res = resources[l.data.name+".mesh"]
 164                                 lod_st.append(obj_res.create_reference_statement("mesh", mesh_res))
 165
 166                                 prev_mesh = l.data.name
 167
 168                         material = None
 169                         if l.material_slots:
 170                                 material = l.material_slots[0].material
 171                         if material:
 172                                 if material.render_mode=='EXTERNAL':
 173                                         tech_name = material.technique
 174                                 elif material.material_atlas:
 175                                         tech_name = "material_atlas_{}.tech".format(os.path.splitext(material.technique)[0])
 176                                 else:
 177                                         tech_name = material.name+".tech"
 178                         else:
 179                                 tech_name = "stub.tech"
 180
 181                         if tech_name!=prev_tech:
 182                                 if material and material.render_mode=='EXTERNAL':
 183                                         lod_st.append(Statement("technique", material.technique))
 184                                 else:
 185                                         lod_st.append(obj_res.create_reference_statement("technique", resources[tech_name]))
 186                                 prev_tech = tech_name
 187
 188                         if i>0:
 189                                 st = Statement("level_of_detail", i)
 190                                 st.sub = lod_st
 191                                 statements.append(st)
 192                         else:
 193                                 statements += lod_st
 194
 195                 progress.set_progress(1.0)
 196
 197                 return obj_res
 198
 199         def export_stub_technique(self):
 200                 from .datafile import Resource, Statement
 201                 tech_res = Resource("stub.tech", "technique")
 202                 pass_st = Statement("pass", "")
 203                 tech_res.statements.append(pass_st)
 204                 mat_st = Statement("material")
 205                 pass_st.sub.append(mat_st)
 206                 mat_st.sub.append(Statement("basic"))
 207                 return tech_res