1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
import bpy
import math
from typing import Optional, List, Dict, Any
from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
from ..com.gltf2_blender_extras import generate_extras
from ..com.gltf2_blender_conversion import PBR_WATTS_TO_LUMENS
from io_scene_gltf2.io.com import gltf2_io_lights_punctual
from io_scene_gltf2.io.com import gltf2_io_debug
from io_scene_gltf2.blender.exp import gltf2_blender_gather_light_spots
from io_scene_gltf2.blender.exp import gltf2_blender_search_node_tree
@cached
def gather_lights_punctual(blender_lamp, export_settings) -> Optional[Dict[str, Any]]:
if not __filter_lights_punctual(blender_lamp, export_settings):
return None
light = gltf2_io_lights_punctual.Light(
color=__gather_color(blender_lamp, export_settings),
intensity=__gather_intensity(blender_lamp, export_settings),
spot=__gather_spot(blender_lamp, export_settings),
type=__gather_type(blender_lamp, export_settings),
range=__gather_range(blender_lamp, export_settings),
name=__gather_name(blender_lamp, export_settings),
extensions=__gather_extensions(blender_lamp, export_settings),
extras=__gather_extras(blender_lamp, export_settings)
)
return light.to_dict()
def __filter_lights_punctual(blender_lamp, export_settings) -> bool:
if blender_lamp.type in ["HEMI", "AREA"]:
gltf2_io_debug.print_console("WARNING", "Unsupported light source {}".format(blender_lamp.type))
return False
return True
def __gather_color(blender_lamp, export_settings) -> Optional[List[float]]:
emission_node = __get_cycles_emission_node(blender_lamp)
if emission_node is not None:
return list(emission_node.inputs["Color"].default_value)[:3]
return list(blender_lamp.color)
def __gather_intensity(blender_lamp, export_settings) -> Optional[float]:
emission_node = __get_cycles_emission_node(blender_lamp)
if emission_node is not None:
if blender_lamp.type != 'SUN':
# When using cycles, the strength should be influenced by a LightFalloff node
result = gltf2_blender_search_node_tree.from_socket(
emission_node.inputs.get("Strength"),
gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeLightFalloff)
)
if result:
quadratic_falloff_node = result[0].shader_node
emission_strength = quadratic_falloff_node.inputs["Strength"].default_value / (math.pi * 4.0)
else:
gltf2_io_debug.print_console('WARNING',
'No quadratic light falloff node attached to emission strength property')
emission_strength = blender_lamp.energy
else:
emission_strength = emission_node.inputs["Strength"].default_value
else:
emission_strength = blender_lamp.energy
if export_settings['gltf_lighting_mode'] == 'RAW':
return emission_strength
else:
# Assume at this point the computed strength is still in the appropriate watt-related SI unit, which if everything up to here was done with physical basis it hopefully should be.
if blender_lamp.type == 'SUN': # W/m^2 in Blender to lm/m^2 for GLTF/KHR_lights_punctual.
emission_luminous = emission_strength
else:
# Other than directional, only point and spot lamps are supported by GLTF.
# In Blender, points are omnidirectional W, and spots are specified as if they're points.
# Point and spot should both be lm/r^2 in GLTF.
emission_luminous = emission_strength / (4*math.pi)
if export_settings['gltf_lighting_mode'] == 'SPEC':
emission_luminous *= PBR_WATTS_TO_LUMENS
elif export_settings['gltf_lighting_mode'] == 'COMPAT':
pass # Just so we have an exhaustive tree to catch bugged values.
else:
raise ValueError(export_settings['gltf_lighting_mode'])
return emission_luminous
def __gather_spot(blender_lamp, export_settings) -> Optional[gltf2_io_lights_punctual.LightSpot]:
if blender_lamp.type == "SPOT":
return gltf2_blender_gather_light_spots.gather_light_spot(blender_lamp, export_settings)
return None
def __gather_type(blender_lamp, _) -> str:
return {
"POINT": "point",
"SUN": "directional",
"SPOT": "spot"
}[blender_lamp.type]
def __gather_range(blender_lamp, export_settings) -> Optional[float]:
if blender_lamp.use_custom_distance:
return blender_lamp.cutoff_distance
return None
def __gather_name(blender_lamp, export_settings) -> Optional[str]:
return blender_lamp.name
def __gather_extensions(blender_lamp, export_settings) -> Optional[dict]:
return None
def __gather_extras(blender_lamp, export_settings) -> Optional[Any]:
if export_settings['gltf_extras']:
return generate_extras(blender_lamp)
return None
def __get_cycles_emission_node(blender_lamp) -> Optional[bpy.types.ShaderNodeEmission]:
if blender_lamp.use_nodes and blender_lamp.node_tree:
for currentNode in blender_lamp.node_tree.nodes:
is_shadernode_output = isinstance(currentNode, bpy.types.ShaderNodeOutputLight)
if is_shadernode_output:
if not currentNode.is_active_output:
continue
result = gltf2_blender_search_node_tree.from_socket(
currentNode.inputs.get("Surface"),
gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeEmission)
)
if not result:
continue
return result[0].shader_node
return None
|
