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 export_object_resources(self, context, obj, resources, material_atlases, progress):
  28                 if material_atlases is None:
  29                         material_atlases = {}
  30
  31                 lods = self.collect_object_lods(obj)
  32
  33                 from .export_mesh import MeshExporter
  34                 from .export_material import MaterialAtlasExporter, MaterialExporter
  35                 from .mesh import create_mesh_from_object
  36                 from .material import Material, create_material_atlas
  37                 mesh_export = MeshExporter()
  38                 material_export = MaterialExporter()
  39                 material_atlas_export = MaterialAtlasExporter()
  40
  41                 for i, l in enumerate(lods):
  42                         lod_index = l.lod_index if l.lod_for_parent else 0
  43                         progress.push_task_slice("LOD {}".format(lod_index), i, len(lods))
  44
  45                         material_atlas = None
  46                         atlas_flags = [m.render_mode!='EXTERNAL' and m.material_atlas for m in l.data.materials if m]
  47                         if any(atlas_flags):
  48                                 mmk = lambda m: m.shader if m.render_mode=='CUSTOM' else ""
  49                                 material_atlas_key = mmk(l.data.materials[0])
  50                                 key_mismatch = any(mmk(m)!=material_atlas_key for m in l.data.materials)
  51                                 if not all(atlas_flags) or key_mismatch:
  52                                         raise Exception("Invalid configuration on object {}: Mixed material atlas state")
  53
  54                                 if material_atlas_key in material_atlases:
  55                                         material_atlas = material_atlases[material_atlas_key]
  56                                 else:
  57                                         material_atlas = create_material_atlas(context, l.data.materials[0])
  58                                         material_atlases[material_atlas_key] = material_atlas
  59
  60                                 tech_name = "{}.tech".format(material_atlas.name)
  61                                 if tech_name not in resources:
  62                                         material_atlas_export.export_technique_resources(material_atlas, resources)
  63                                         resources[tech_name] = material_atlas_export.export_technique(material_atlas, resources)
  64                         elif l.material_slots and l.material_slots[0].material:
  65                                 material = l.material_slots[0].material
  66                                 if material.render_mode!='EXTERNAL':
  67                                         tech_name = material.name+".tech"
  68                                         if tech_name not in resources:
  69                                                 material_export.export_technique_resources(material, resources)
  70                                                 resources[tech_name] = material_export.export_technique(material, resources)
  71                         elif "stub.tech" not in resources:
  72                                 resources["stub.tech"] = self.export_stub_technique()
  73
  74                         mesh_name = l.data.name+".mesh"
  75                         if mesh_name not in resources:
  76                                 mesh = create_mesh_from_object(context, l, material_atlas, progress)
  77                                 mesh_res = mesh_export.export_mesh(context, mesh, progress)
  78                                 resources[mesh_name] = mesh_res
  79
  80                         progress.pop_task()
  81
  82         def export_object(self, obj, resources, progress):
  83                 if obj.type!='MESH':
  84                         raise ValueError("Object {} is not a mesh".format(obj.name))
  85
  86                 lods = self.collect_object_lods(obj)
  87
  88                 from .datafile import Resource, Statement
  89                 obj_res = Resource(obj.name+".object", "object")
  90                 statements = obj_res.statements
  91
  92                 center, radius = self.compute_bounding_sphere(obj)
  93                 statements.append(Statement("bounding_sphere_hint", *center, radius))
  94
  95                 prev_mesh = None
  96                 prev_tech = None
  97                 for i, l in enumerate(lods):
  98                         lod_st = []
  99
 100                         if l.data.name!=prev_mesh:
 101                                 mesh_res = resources[l.data.name+".mesh"]
 102                                 lod_st.append(obj_res.create_reference_statement("mesh", mesh_res))
 103
 104                                 prev_mesh = l.data.name
 105
 106                         material = None
 107                         if l.material_slots:
 108                                 material = l.material_slots[0].material
 109                         if material:
 110                                 if material.render_mode=='EXTERNAL':
 111                                         tech_name = material.technique
 112                                 elif material.material_atlas:
 113                                         tech_name = "material_atlas_{}.tech".format(os.path.splitext(material.technique)[0])
 114                                 else:
 115                                         tech_name = material.name+".tech"
 116                         else:
 117                                 tech_name = "stub.tech"
 118
 119                         if tech_name!=prev_tech:
 120                                 if material and material.render_mode=='EXTERNAL':
 121                                         lod_st.append(Statement("technique", material.technique))
 122                                 else:
 123                                         lod_st.append(obj_res.create_reference_statement("technique", resources[tech_name]))
 124                                 prev_tech = tech_name
 125
 126                         if i>0:
 127                                 st = Statement("level_of_detail", i)
 128                                 st.sub = lod_st
 129                                 statements.append(st)
 130                         else:
 131                                 statements += lod_st
 132
 133                 progress.set_progress(1.0)
 134
 135                 return obj_res
 136
 137         def export_stub_technique(self):
 138                 from .datafile import Resource, Statement, Token
 139                 tech_res = Resource("stub.tech", "technique")
 140                 pass_st = Statement("method", "")
 141                 tech_res.statements.append(pass_st)
 142                 mat_st = Statement("material")
 143                 pass_st.sub.append(mat_st)
 144                 mat_st.sub.append(Statement("type", Token("basic")))
 145                 return tech_res