blender/io_mspgl/export_mesh.py

   1 import itertools
   2 import os
   3 import bpy
   4 import mathutils
   5
   6 class MeshExporter:
   7         def __init__(self):
   8                 self.show_progress = True
   9                 self.use_strips = True
  10                 self.use_degen_tris = False
  11                 self.export_all = False
  12
  13         def join_strips(self, strips):
  14                 big_strip = []
  15
  16                 for s in strips:
  17                         if big_strip:
  18                                 # Generate glue elements, ensuring that the next strip begins at
  19                                 # an even position
  20                                 glue = [big_strip[-1], s[0]]
  21                                 if len(big_strip)%2:
  22                                         glue += [s[0]]
  23
  24                                 big_strip += glue
  25
  26                         big_strip += s
  27
  28                 return big_strip
  29
  30         def export_to_file(self, context, out_fn):
  31                 if self.export_all:
  32                         objs = [o for o in context.selected_objects if o.type=="MESH"]
  33                 else:
  34                         objs = [context.active_object]
  35
  36                 from .util import Progress
  37
  38                 path, base = os.path.split(out_fn)
  39                 base, ext = os.path.splitext(base)
  40
  41                 progress = Progress(self.show_progress and context)
  42                 for i, obj in enumerate(objs):
  43                         if self.export_all:
  44                                 out_fn = os.path.join(path, obj.data.name+ext)
  45
  46                         progress.push_task_slice(obj.data.name, i, len(objs))
  47                         resource = self.export_mesh(context, obj, progress)
  48
  49                         resource.write_to_file(out_fn)
  50                         progress.pop_task()
  51
  52         def export_mesh(self, context, mesh_or_obj, progress):
  53                 from .mesh import Mesh, create_mesh_from_object
  54
  55                 if type(mesh_or_obj)==Mesh:
  56                         mesh = mesh_or_obj
  57                 else:
  58                         progress.push_task("", 0.0, 0.9)
  59                         mesh = create_mesh_from_object(context, mesh_or_obj, progress)
  60                         progress.pop_task()
  61
  62                 from .datafile import Resource, Statement, Token
  63                 resource = Resource(mesh.name+".mesh", "mesh")
  64                 statements = resource.statements
  65
  66                 st = Statement("vertices", Token("NORMAL3"))
  67                 if mesh.vertices[0].color:
  68                         st.append(Token("COLOR4_UBYTE"))
  69                 if mesh.uv_layers:
  70                         for u in mesh.uv_layers:
  71                                 size = str(len(u.uvs[0]))
  72                                 if u.unit==0:
  73                                         st.append(Token("TEXCOORD"+size))
  74                                 else:
  75                                         st.append(Token("TEXCOORD{}_{}".format(size, u.unit)))
  76                         if mesh.tangent_vecs:
  77                                 st.append(Token("TANGENT3"))
  78                 if mesh.vertex_groups:
  79                         st.append(Token("GROUP{}".format(mesh.max_groups_per_vertex)))
  80                         st.append(Token("WEIGHT{}".format(mesh.max_groups_per_vertex)))
  81                 st.append(Token("VERTEX3"))
  82
  83                 normal = None
  84                 color = None
  85                 uvs = [None]*len(mesh.uv_layers)
  86                 tan = None
  87                 group = None
  88                 weight = None
  89                 for v in mesh.vertices:
  90                         if v.normal!=normal:
  91                                 st.sub.append(Statement("normal", *v.normal))
  92                                 normal = v.normal
  93                         if v.color!=color:
  94                                 st.sub.append(Statement("color", *v.color))
  95                                 color = v.color
  96                         for i, u in enumerate(mesh.uv_layers):
  97                                 if v.uvs[i]!=uvs[i]:
  98                                         if u.unit==0:
  99                                                 st.sub.append(Statement("texcoord", *v.uvs[i]))
 100                                         else:
 101                                                 st.sub.append(Statement("multitexcoord", u.unit, *v.uvs[i]))
 102                                         uvs[i] = v.uvs[i]
 103                         if mesh.tangent_vecs:
 104                                 if v.tan!=tan:
 105                                         st.sub.append(Statement("tangent", *v.tan))
 106                                         tan = v.tan
 107                         if mesh.vertex_groups:
 108                                 v_group = [g.group for g in v.groups]
 109                                 v_weight = [g.weight for g in v.groups]
 110                                 if v_group!=group:
 111                                         st.sub.append(Statement("group", *v_group))
 112                                         group = v_group
 113                                 if v_weight!=weight:
 114                                         st.sub.append(Statement("weight", *v_weight))
 115                                         weight = v_weight
 116                         st.sub.append(Statement("vertex", *v.co))
 117
 118                 statements.append(st)
 119
 120                 if self.use_strips:
 121                         strips = mesh.vertex_sequence
 122                         if self.use_degen_tris:
 123                                 strips = [self.join_strips(strips)]
 124
 125                         for s in strips:
 126                                 st = Statement("batch", Token("TRIANGLE_STRIP"))
 127                                 for i in range(0, len(s), 32):
 128                                         st.sub.append(Statement("indices", *(v.index for v in s[i:i+32])))
 129                                 statements.append(st)
 130                 else:
 131                         st = Statement("batch", Token('TRIANGLES'))
 132                         for f in mesh.faces:
 133                                 st.sub.append(Statement("indices", *(v.index for v in f.vertices)))
 134                         statements.append(st)
 135
 136                 if mesh.lines:
 137                         st = Statement("batch", Token('LINES'))
 138                         for l in mesh.lines:
 139                                 st.sub.append(Statement("indices", *(v.index for v in l.vertices)))
 140                         statements.append(st)
 141
 142                 if mesh.winding_test:
 143                         statements.append(Statement("winding", Token('COUNTERCLOCKWISE')))
 144
 145                 progress.set_progress(1.0)
 146
 147                 return resource