Include only tangent in mesh data and calculate binormal on the fly
[libs/gl.git] / 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