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)
11 class MaterialProperty:
12 def __init__(self, value):
17 def set_from_input(self, node_tree, input_socket, alpha_socket=None):
18 if type(self.value)==tuple:
20 self.value = input_socket.default_value[:len(self.value)-1]+(alpha_socket.default_value,)
22 self.value = input_socket.default_value[:len(self.value)]
24 self.value = input_socket.default_value
26 from_node, _ = get_linked_node_and_socket(node_tree, input_socket)
29 if from_node.type=='NORMAL_MAP':
30 from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
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")
37 if from_node.type=='TEX_IMAGE':
38 self.texture = from_node
40 self.tex_usage = 'RGBA'
41 elif type(self.value)==tuple:
42 self.tex_usage = 'RGB'
44 self.tex_usage = 'GRAY'
46 raise Exception("Unsupported property input node type "+from_node.type)
49 def __init__(self, material):
50 self.name = material.name
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))
58 self.render_mode = material.render_mode
59 self.technique = material.technique
60 self.shader = material.shader
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")
68 for n in material.node_tree.nodes:
69 if n.type=='OUTPUT_MATERIAL':
74 raise Exception("No material output node found")
76 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
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)
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"])
88 self.properties = (self.base_color, self.metalness, self.roughness, self.normal, self.emission)
92 def __init__(self, materials):
93 self.render_mode = materials[0].render_mode
94 if self.render_mode=='EXTERNAL':
95 raise Exception("Material map with external render mode does not make sense")
97 self.shader = materials[0].shader
99 self.name = "material_map_"+os.path.splitext(self.shader)[0]
101 self.name = "material_map"
102 self.materials = materials
103 self.material_names = [m.name for m in self.materials]
104 for m in self.materials:
105 if m.render_mode!=self.render_mode:
106 raise Exception("Conflicting render modes in MaterialMap constructor")
107 if self.render_mode=='CUSTOM' and m.shader!=self.shader:
108 raise Exception("Conflicting shaders in MaterialMap constructor")
110 count = len(self.materials)
112 while size*size*2<count:
115 self.size = (size, size)
117 self.size = (size*2, size)
119 from .util import get_colormap
121 cm = get_colormap(True)
122 self.base_color_data = ""
123 for m in map(Material, self.materials):
124 if any(p.texture for p in m.properties):
125 raise Exception("Texturing is incompatible with material map")
126 base_color = [int(cm(c)*255) for c in m.base_color.value]
127 self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
128 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
130 def get_material_uv(self, material):
131 index = self.material_names.index(material.name)
132 x = index%self.size[0]
133 y = index//self.size[0]
134 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
136 def create_material_map(context, material):
137 if not material.material_map:
138 raise Exception("Material is not part of a material map")
140 tech = material.technique
142 for m in context.blend_data.materials:
143 if m.material_map and m.technique==tech:
146 mat_map = MaterialMap(materials)