blender/io_mspgl/export_object.py

   1 import os
   2 import mathutils
   3
   4 class ObjectExporter:
   5         def compute_bounding_sphere(self, obj):
   6                 p1 = max(((v.co, v.co.length) for v in obj.data.vertices), key=lambda x:x[1])[0]
   7                 p2 = max(((v.co, (v.co-p1).length) for v in obj.data.vertices), key=lambda x:x[1])[0]
   8                 center = (p1+p2)/2
   9                 radius = (p1-p2).length/2
  10                 for v in obj.data.vertices:
  11                         d = v.co-center
  12                         if d.length>radius:
  13                                 center += d*(1-radius/d.length)/2
  14                                 radius = (radius+d.length)/2
  15
  16                 return center, radius
  17
  18         def collect_object_lods(self, obj):
  19                 lods = [obj]
  20                 lods += sorted([c for c in obj.children if c.lod_for_parent], key=(lambda l: l.lod_index))
  21                 for i, l in enumerate(lods):
  22                         if i>0 and l.lod_index!=i:
  23                                 raise Exception("Invalid configuration on object {}: Inconsistent LOD indices".format(obj.name))
  24
  25                 return lods
  26
  27         def create_mesh_exporter(self):
  28                 from .export_mesh import MeshExporter
  29                 mesh_export = MeshExporter()
  30                 return mesh_export
  31
  32         def create_material_exporter(self):
  33                 from .export_material import MaterialExporter
  34                 material_export = MaterialExporter()
  35                 return material_export
  36
  37         def create_material_atlas_exporter(self):
  38                 from .export_material import MaterialAtlasExporter
  39                 material_atlas_export = MaterialAtlasExporter()
  40                 return material_atlas_export
  41
  42         def export_object_resources(self, context, obj, resources, material_atlases, progress):
  43                 if material_atlases is None:
  44                         material_atlases = {}
  45
  46                 lods = self.collect_object_lods(obj)
  47
  48                 from .mesh import create_mesh_from_object
  49                 from .material import create_material_atlas
  50                 mesh_export = self.create_mesh_exporter()
  51                 material_export = self.create_material_exporter()
  52                 material_atlas_export = self.create_material_atlas_exporter()
  53
  54                 for i, l in enumerate(lods):
  55                         lod_index = l.lod_index if l.lod_for_parent else 0
  56                         progress.push_task_slice("LOD {}".format(lod_index), i, len(lods))
  57
  58                         material_atlas = None
  59                         atlas_flags = [m.render_mode!='EXTERNAL' and m.material_atlas for m in l.data.materials if m]
  60                         if any(atlas_flags):
  61                                 mmk = lambda m: m.shader if m.render_mode=='CUSTOM' else ""
  62                                 material_atlas_key = mmk(l.data.materials[0])
  63                                 key_mismatch = any(mmk(m)!=material_atlas_key for m in l.data.materials)
  64                                 if not all(atlas_flags) or key_mismatch:
  65                                         raise Exception("Invalid configuration on object {}: Mixed material atlas state")
  66
  67                                 if material_atlas_key in material_atlases:
  68                                         material_atlas = material_atlases[material_atlas_key]
  69                                 else:
  70                                         material_atlas = create_material_atlas(context, l.data.materials[0])
  71                                         material_atlases[material_atlas_key] = material_atlas
  72
  73                                 tech_name = "{}.tech".format(material_atlas.name)
  74                                 if tech_name not in resources:
  75                                         material_atlas_export.export_technique_resources(material_atlas, resources)
  76                                         resources[tech_name] = material_atlas_export.export_technique(material_atlas, resources)
  77                         elif l.material_slots and l.material_slots[0].material:
  78                                 material = l.material_slots[0].material
  79                                 if material.render_mode!='EXTERNAL':
  80                                         tech_name = material.name+".tech"
  81                                         if tech_name not in resources:
  82                                                 material_export.export_technique_resources(material, resources)
  83                                                 resources[tech_name] = material_export.export_technique(material, resources)
  84                         elif "stub.tech" not in resources:
  85                                 resources["stub.tech"] = self.export_stub_technique()
  86
  87                         mesh_name = l.data.name+".mesh"
  88                         if mesh_name not in resources:
  89                                 mesh = create_mesh_from_object(context, l, material_atlas, progress)
  90                                 mesh_res = mesh_export.export_mesh(context, mesh, progress)
  91                                 resources[mesh_name] = mesh_res
  92
  93                         progress.pop_task()
  94
  95         def export_object(self, obj, resources, progress):
  96                 if obj.type!='MESH':
  97                         raise ValueError("Object {} is not a mesh".format(obj.name))
  98
  99                 lods = self.collect_object_lods(obj)
 100
 101                 from .datafile import Resource, Statement
 102                 obj_res = Resource(obj.name+".object", "object")
 103                 statements = obj_res.statements
 104
 105                 center, radius = self.compute_bounding_sphere(obj)
 106                 statements.append(Statement("bounding_sphere_hint", *center, radius))
 107
 108                 prev_mesh = None
 109                 prev_tech = None
 110                 for i, l in enumerate(lods):
 111                         lod_st = []
 112
 113                         if l.data.name!=prev_mesh:
 114                                 mesh_res = resources[l.data.name+".mesh"]
 115                                 lod_st.append(obj_res.create_reference_statement("mesh", mesh_res))
 116
 117                                 prev_mesh = l.data.name
 118
 119                         material = None
 120                         if l.material_slots:
 121                                 material = l.material_slots[0].material
 122                         if material:
 123                                 if material.render_mode=='EXTERNAL':
 124                                         tech_name = material.technique
 125                                 elif material.material_atlas:
 126                                         tech_name = "material_atlas_{}.tech".format(os.path.splitext(material.technique)[0])
 127                                 else:
 128                                         tech_name = material.name+".tech"
 129                         else:
 130                                 tech_name = "stub.tech"
 131
 132                         if tech_name!=prev_tech:
 133                                 if material and material.render_mode=='EXTERNAL':
 134                                         lod_st.append(Statement("technique", material.technique))
 135                                 else:
 136                                         lod_st.append(obj_res.create_reference_statement("technique", resources[tech_name]))
 137                                 prev_tech = tech_name
 138
 139                         if i>0:
 140                                 st = Statement("level_of_detail", i)
 141                                 st.sub = lod_st
 142                                 statements.append(st)
 143                         else:
 144                                 statements += lod_st
 145
 146                 progress.set_progress(1.0)
 147
 148                 return obj_res
 149
 150         def export_stub_technique(self):
 151                 from .datafile import Resource, Statement, Token
 152                 tech_res = Resource("stub.tech", "technique")
 153                 pass_st = Statement("method", "")
 154                 tech_res.statements.append(pass_st)
 155                 mat_st = Statement("material")
 156                 pass_st.sub.append(mat_st)
 157                 mat_st.sub.append(Statement("type", Token("basic")))
 158                 return tech_res