blender/io_mspgl/material.py

   1 import os
   2
   3 def get_linked_node_and_socket(node_tree, socket):
   4         for l in node_tree.links:
   5                 if socket==l.to_socket:
   6                         return (l.from_node, l.from_socket)
   7                 elif socket==l.from_socket:
   8                         return (l.to_node, l.to_socket)
   9         return (None, None)
  10
  11 class MaterialProperty:
  12         def __init__(self, value):
  13                 self.value = value
  14                 self.texture = None
  15                 self.tex_usage = None
  16
  17         def set_from_input(self, node_tree, input_socket, alpha_socket=None):
  18                 if type(self.value)==tuple:
  19                         if alpha_socket:
  20                                 self.value = input_socket.default_value[:len(self.value)-1]+(alpha_socket.default_value,)
  21                         else:
  22                                 self.value = input_socket.default_value[:len(self.value)]
  23                 else:
  24                         self.value = input_socket.default_value
  25
  26                 from_node, _ = get_linked_node_and_socket(node_tree, input_socket)
  27                 alpha_from = None
  28                 if from_node:
  29                         if from_node.type=='NORMAL_MAP':
  30                                 from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
  31
  32                         if alpha_socket:
  33                                 alpha_from, _ = get_linked_node_and_socket(node_tree, alpha_socket)
  34                                 if alpha_from and alpha_from!=from_node:
  35                                         raise Exception("Separate textures for color and alpha are not supported")
  36
  37                         if from_node.type=='TEX_IMAGE':
  38                                 self.texture = from_node
  39                                 if alpha_from:
  40                                         self.tex_usage = 'RGBA'
  41                                 elif type(self.value)==tuple:
  42                                         self.tex_usage = 'RGB'
  43                                 else:
  44                                         self.tex_usage = 'GRAY'
  45                         else:
  46                                 raise Exception("Unsupported property input node type "+from_node.type)
  47
  48 class Material:
  49         def __init__(self, material):
  50                 self.name = material.name
  51
  52                 self.base_color = MaterialProperty((0.8, 0.8, 0.8, 1.0))
  53                 self.metalness = MaterialProperty(0.0)
  54                 self.roughness = MaterialProperty(0.5)
  55                 self.normal = MaterialProperty((0.0, 0.0, 0.1))
  56                 self.emission = MaterialProperty((0.0, 0.0, 0.0))
  57
  58                 self.render_mode = material.render_mode
  59                 self.technique = material.technique
  60                 self.shader = material.shader
  61
  62                 if self.render_mode=='EXTERNAL' and not self.technique:
  63                         raise Exception("Missing technique with external rendering mode")
  64                 elif self.render_mode=='CUSTOM' and not self.shader:
  65                         raise Exception("Missing shader with custom rendering mode")
  66
  67                 out_node = None
  68                 for n in material.node_tree.nodes:
  69                         if n.type=='OUTPUT_MATERIAL':
  70                                 out_node = n
  71                                 break
  72
  73                 if not out_node:
  74                         raise Exception("No material output node found")
  75
  76                 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
  77                 if not surface_node:
  78                         raise Exception("Material has no surface node")
  79                 elif surface_node.type!='BSDF_PRINCIPLED':
  80                         raise Exception("Unsupported surface node type "+surface_node.type)
  81
  82                 self.base_color.set_from_input(material.node_tree, surface_node.inputs["Base Color"], surface_node.inputs["Alpha"])
  83                 self.metalness.set_from_input(material.node_tree, surface_node.inputs["Metallic"])
  84                 self.roughness.set_from_input(material.node_tree, surface_node.inputs["Roughness"])
  85                 self.normal.set_from_input(material.node_tree, surface_node.inputs["Normal"])
  86                 self.emission.set_from_input(material.node_tree, surface_node.inputs["Emission"])
  87
  88                 self.properties = (self.base_color, self.metalness, self.roughness, self.normal, self.emission)
  89
  90                 sampler_settings = None
  91                 for p in self.properties:
  92                         if p.texture:
  93                                 settings = (p.texture.default_filter, p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
  94                                 if sampler_settings is None:
  95                                         sampler_settings = settings
  96                                 elif settings!=sampler_settings:
  97                                         raise Exception("Conflicting sampler settings in material textures")
  98
  99
 100 class MaterialMap:
 101         def __init__(self, materials):
 102                 self.render_mode = materials[0].render_mode
 103                 if self.render_mode=='EXTERNAL':
 104                         raise Exception("Material map with external render mode does not make sense")
 105
 106                 self.shader = materials[0].shader
 107                 if self.shader:
 108                         self.name = "material_map_"+os.path.splitext(self.shader)[0]
 109                 else:
 110                         self.name = "material_map"
 111                 self.materials = materials
 112                 self.material_names = [m.name for m in self.materials]
 113                 for m in self.materials:
 114                         if m.render_mode!=self.render_mode:
 115                                 raise Exception("Conflicting render modes in MaterialMap constructor")
 116                         if self.render_mode=='CUSTOM' and m.shader!=self.shader:
 117                                 raise Exception("Conflicting shaders in MaterialMap constructor")
 118
 119                 count = len(self.materials)
 120                 size = 1
 121                 while size*size*2<count:
 122                         size *= 2
 123                 if size*size>=count:
 124                         self.size = (size, size)
 125                 else:
 126                         self.size = (size*2, size)
 127
 128                 from .util import get_colormap
 129
 130                 cm = get_colormap(True)
 131                 self.base_color_data = ""
 132                 for m in map(Material, self.materials):
 133                         if any(p.texture for p in m.properties):
 134                                 raise Exception("Texturing is incompatible with material map")
 135                         base_color = [int(cm(c)*255) for c in m.base_color.value]
 136                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
 137                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
 138
 139         def get_material_uv(self, material):
 140                 index = self.material_names.index(material.name)
 141                 x = index%self.size[0]
 142                 y = index//self.size[0]
 143                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
 144
 145 def create_material_map(context, material):
 146         if not material.material_map:
 147                 raise Exception("Material is not part of a material map")
 148
 149         tech = material.technique
 150         materials = []
 151         for m in context.blend_data.materials:
 152                 if m.material_map and m.technique==tech:
 153                         materials.append(m)
 154
 155         mat_map = MaterialMap(materials)
 156
 157         return mat_map