blender/io_mspgl/export_mesh.py

   1 import itertools
   2 import os
   3 import bpy
   4 import mathutils
   5
   6 class MeshExporter:
   7         def export_mesh(self, context, mesh_or_obj, progress):
   8                 from .mesh import Mesh, create_mesh_from_object
   9
  10                 if type(mesh_or_obj)==Mesh:
  11                         mesh = mesh_or_obj
  12                 else:
  13                         progress.push_task("", 0.0, 0.9)
  14                         mesh = create_mesh_from_object(context, mesh_or_obj, progress)
  15                         progress.pop_task()
  16
  17                 from .datafile import Resource, Statement, Token
  18                 resource = Resource(mesh.name+".mesh", "mesh")
  19                 statements = resource.statements
  20
  21                 st = Statement("vertices", Token("VERTEX3_FLOAT"))
  22                 stride = 12
  23                 if mesh.vertices[0].color:
  24                         st.append(Token("COLOR4_UBYTE"))
  25                         stride += 4
  26                 if mesh.uv_layers:
  27                         for u in mesh.uv_layers:
  28                                 size = len(u.uvs[0])
  29                                 min_val = min(*u.uvs[0])
  30                                 max_val = max(*u.uvs[1])
  31                                 for c in u.uvs:
  32                                         min_val = min(min_val, *c)
  33                                         max_val = max(max_val, *c)
  34                                 uv_type = "USHORT" if min_val>=0.0 and max_val<=1.0 else "FLOAT"
  35                                 if uv_type=="FLOAT" and stride%4:
  36                                         pad = 4-stride%4
  37                                         st.append(Token("PADDING{}".format(pad)))
  38                                         stride += pad
  39                                 if u.unit==0:
  40                                         st.append(Token("TEXCOORD{}_{}".format(size, uv_type)))
  41                                 else:
  42                                         st.append(Token("TEXCOORD{}_{}_{}".format(size, u.unit, uv_type)))
  43                                 stride += (2 if uv_type=="USHORT" else 4)*size
  44                 if mesh.vertex_groups:
  45                         st.append(Token("WEIGHT{}_USHORT".format(mesh.max_groups_per_vertex)))
  46                         st.append(Token("GROUP{}_UBYTE".format(mesh.max_groups_per_vertex)))
  47                         stride += 3*mesh.max_groups_per_vertex
  48                 st.append(Token("NORMAL3_BYTE"))
  49                 stride += 3
  50                 if mesh.uv_layers and mesh.tangent_vecs:
  51                         st.append(Token("TANGENT3_BYTE"))
  52                         stride += 3
  53                 if stride%4:
  54                         pad = 4-stride%4
  55                         st.append(Token("PADDING{}_UBYTE".format(pad)))
  56                         stride += pad
  57
  58                 normal = None
  59                 color = None
  60                 uvs = [None]*len(mesh.uv_layers)
  61                 tan = None
  62                 group = None
  63                 weight = None
  64                 for v in mesh.vertices:
  65                         if v.normal!=normal:
  66                                 st.sub.append(Statement("normal", *v.normal))
  67                                 normal = v.normal
  68                         if v.color!=color:
  69                                 st.sub.append(Statement("color", *v.color))
  70                                 color = v.color
  71                         for i, u in enumerate(mesh.uv_layers):
  72                                 if v.uvs[i]!=uvs[i]:
  73                                         if u.unit==0:
  74                                                 st.sub.append(Statement("texcoord", *v.uvs[i]))
  75                                         else:
  76                                                 st.sub.append(Statement("multitexcoord", u.unit, *v.uvs[i]))
  77                                         uvs[i] = v.uvs[i]
  78                         if mesh.tangent_vecs:
  79                                 if v.tan!=tan:
  80                                         st.sub.append(Statement("tangent", *v.tan))
  81                                         tan = v.tan
  82                         if mesh.vertex_groups:
  83                                 v_group = [g.group for g in v.groups]
  84                                 v_weight = [g.weight for g in v.groups]
  85                                 if v_group!=group:
  86                                         st.sub.append(Statement("group", *v_group))
  87                                         group = v_group
  88                                 if v_weight!=weight:
  89                                         st.sub.append(Statement("weight", *v_weight))
  90                                         weight = v_weight
  91                         st.sub.append(Statement("vertex", *v.co))
  92
  93                 statements.append(st)
  94
  95                 if mesh.use_strips:
  96                         for s in mesh.vertex_sequence:
  97                                 st = Statement("batch", Token("TRIANGLE_STRIP"))
  98                                 for i in range(0, len(s), 32):
  99                                         st.sub.append(Statement("indices", *(v.index for v in s[i:i+32])))
 100                                 statements.append(st)
 101                 else:
 102                         st = Statement("batch", Token('TRIANGLES'))
 103                         for f in mesh.faces:
 104                                 st.sub.append(Statement("indices", *(v.index for v in f.vertices)))
 105                         statements.append(st)
 106
 107                 if mesh.lines:
 108                         st = Statement("batch", Token('LINES'))
 109                         for l in mesh.lines:
 110                                 st.sub.append(Statement("indices", *(v.index for v in l.vertices)))
 111                         statements.append(st)
 112
 113                 if mesh.winding_test:
 114                         statements.append(Statement("winding", Token('COUNTERCLOCKWISE')))
 115
 116                 progress.set_progress(1.0)
 117
 118                 return resource