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# Copyright 2018 The glTF-Blender-IO authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Imports
#
import os
#
# Globals
#
#
# Functions
#
def get_material_requires_texcoords(glTF, index):
"""Query function, if a material "needs" texture coordinates. This is the case, if a texture is present and used."""
if glTF.materials is None:
return False
materials = glTF.materials
if index < 0 or index >= len(materials):
return False
material = materials[index]
# General
if material.emissive_texture is not None:
return True
if material.normal_texture is not None:
return True
if material.occlusion_texture is not None:
return True
# Metallic roughness
if material.pbr_metallic_roughness is not None and \
material.pbr_metallic_roughness.base_color_texture is not None:
return True
if material.pbr_metallic_roughness is not None and \
material.pbr_metallic_roughness.metallic_roughness_texture is not None:
return True
return False
def get_material_requires_normals(glTF, index):
"""
Query function, if a material "needs" normals. This is the case, if a texture is present and used.
At point of writing, same function as for texture coordinates.
"""
return get_material_requires_texcoords(glTF, index)
def get_material_index(glTF, name):
"""Return the material index in the glTF array."""
if name is None:
return -1
if glTF.materials is None:
return -1
index = 0
for material in glTF.materials:
if material.name == name:
return index
index += 1
return -1
def get_mesh_index(glTF, name):
"""Return the mesh index in the glTF array."""
if glTF.meshes is None:
return -1
index = 0
for mesh in glTF.meshes:
if mesh.name == name:
return index
index += 1
return -1
def get_skin_index(glTF, name, index_offset):
"""Return the skin index in the glTF array."""
if glTF.skins is None:
return -1
skeleton = get_node_index(glTF, name)
index = 0
for skin in glTF.skins:
if skin.skeleton == skeleton:
return index + index_offset
index += 1
return -1
def get_camera_index(glTF, name):
"""Return the camera index in the glTF array."""
if glTF.cameras is None:
return -1
index = 0
for camera in glTF.cameras:
if camera.name == name:
return index
index += 1
return -1
def get_light_index(glTF, name):
"""Return the light index in the glTF array."""
if glTF.extensions is None:
return -1
extensions = glTF.extensions
if extensions.get('KHR_lights_punctual') is None:
return -1
khr_lights_punctual = extensions['KHR_lights_punctual']
if khr_lights_punctual.get('lights') is None:
return -1
lights = khr_lights_punctual['lights']
index = 0
for light in lights:
if light['name'] == name:
return index
index += 1
return -1
def get_node_index(glTF, name):
"""Return the node index in the glTF array."""
if glTF.nodes is None:
return -1
index = 0
for node in glTF.nodes:
if node.name == name:
return index
index += 1
return -1
def get_scene_index(glTF, name):
"""Return the scene index in the glTF array."""
if glTF.scenes is None:
return -1
index = 0
for scene in glTF.scenes:
if scene.name == name:
return index
index += 1
return -1
def get_texture_index(glTF, filename):
"""Return the texture index in the glTF array by a given file path."""
if glTF.textures is None:
return -1
image_index = get_image_index(glTF, filename)
if image_index == -1:
return -1
for texture_index, texture in enumerate(glTF.textures):
if image_index == texture.source:
return texture_index
return -1
def get_image_index(glTF, filename):
"""Return the image index in the glTF array."""
if glTF.images is None:
return -1
image_name = get_image_name(filename)
for index, current_image in enumerate(glTF.images):
if image_name == current_image.name:
return index
return -1
def get_image_name(filename):
"""Return user-facing, extension-agnostic name for image."""
return os.path.splitext(filename)[0]
def get_scalar(default_value, init_value=0.0):
"""Return scalar with a given default/fallback value."""
return_value = init_value
if default_value is None:
return return_value
return_value = default_value
return return_value
def get_vec2(default_value, init_value=[0.0, 0.0]):
"""Return vec2 with a given default/fallback value."""
return_value = init_value
if default_value is None or len(default_value) < 2:
return return_value
index = 0
for number in default_value:
return_value[index] = number
index += 1
if index == 2:
return return_value
return return_value
def get_vec3(default_value, init_value=[0.0, 0.0, 0.0]):
"""Return vec3 with a given default/fallback value."""
return_value = init_value
if default_value is None or len(default_value) < 3:
return return_value
index = 0
for number in default_value:
return_value[index] = number
index += 1
if index == 3:
return return_value
return return_value
def get_vec4(default_value, init_value=[0.0, 0.0, 0.0, 1.0]):
"""Return vec4 with a given default/fallback value."""
return_value = init_value
if default_value is None or len(default_value) < 4:
return return_value
index = 0
for number in default_value:
return_value[index] = number
index += 1
if index == 4:
return return_value
return return_value
def get_index(elements, name):
"""Return index of a glTF element by a given name."""
if elements is None or name is None:
return -1
index = 0
for element in elements:
if isinstance(element, dict):
if element.get('name') == name:
return index
else:
if element.name == name:
return index
index += 1
return -1
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