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# Copyright 2018-2019 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.
import bpy
from mathutils import Vector, Matrix
from ..com.gltf2_blender_material_helpers import get_gltf_node_name
from ...blender.com.gltf2_blender_conversion import texture_transform_blender_to_gltf
from io_scene_gltf2.io.com import gltf2_io_debug
def get_animation_target(action_group: bpy.types.ActionGroup):
return action_group.channels[0].data_path.split('.')[-1]
def get_object_from_datapath(blender_object, data_path: str):
if "." in data_path:
# gives us: ('modifiers["Subsurf"]', 'levels')
path_prop, path_attr = data_path.rsplit(".", 1)
# same as: prop = obj.modifiers["Subsurf"]
if path_attr in ["rotation", "scale", "location",
"rotation_axis_angle", "rotation_euler", "rotation_quaternion"]:
prop = blender_object.path_resolve(path_prop)
else:
prop = blender_object.path_resolve(data_path)
else:
prop = blender_object
# single attribute such as name, location... etc
# path_attr = data_path
return prop
def get_socket_or_texture_slot(blender_material: bpy.types.Material, name: str):
"""
For a given material input name, retrieve the corresponding node tree socket or blender render texture slot.
:param blender_material: a blender material for which to get the socket/slot
:param name: the name of the socket/slot
:return: either a blender NodeSocket, if the material is a node tree or a blender Texture otherwise
"""
if blender_material.node_tree and blender_material.use_nodes:
#i = [input for input in blender_material.node_tree.inputs]
#o = [output for output in blender_material.node_tree.outputs]
if name == "Emissive":
# Check for a dedicated Emission node first, it must supersede the newer built-in one
# because the newer one is always present in all Principled BSDF materials.
type = bpy.types.ShaderNodeEmission
name = "Color"
nodes = [n for n in blender_material.node_tree.nodes if isinstance(n, type)]
inputs = sum([[input for input in node.inputs if input.name == name] for node in nodes], [])
if inputs:
return inputs[0]
# If a dedicated Emission node was not found, fall back to the Principled BSDF Emission socket.
name = "Emission"
type = bpy.types.ShaderNodeBsdfPrincipled
elif name == "Background":
type = bpy.types.ShaderNodeBackground
name = "Color"
else:
type = bpy.types.ShaderNodeBsdfPrincipled
nodes = [n for n in blender_material.node_tree.nodes if isinstance(n, type)]
inputs = sum([[input for input in node.inputs if input.name == name] for node in nodes], [])
if inputs:
return inputs[0]
return None
def get_socket_or_texture_slot_old(blender_material: bpy.types.Material, name: str):
"""
For a given material input name, retrieve the corresponding node tree socket in the special glTF node group.
:param blender_material: a blender material for which to get the socket/slot
:param name: the name of the socket/slot
:return: either a blender NodeSocket, if the material is a node tree or a blender Texture otherwise
"""
gltf_node_group_name = get_gltf_node_name().lower()
if blender_material.node_tree and blender_material.use_nodes:
nodes = [n for n in blender_material.node_tree.nodes if \
isinstance(n, bpy.types.ShaderNodeGroup) and \
(n.node_tree.name.startswith('glTF Metallic Roughness') or n.node_tree.name.lower() == gltf_node_group_name)]
inputs = sum([[input for input in node.inputs if input.name == name] for node in nodes], [])
if inputs:
return inputs[0]
return None
def find_shader_image_from_shader_socket(shader_socket, max_hops=10):
"""Find any ShaderNodeTexImage in the path from the socket."""
if shader_socket is None:
return None
if max_hops <= 0:
return None
for link in shader_socket.links:
if isinstance(link.from_node, bpy.types.ShaderNodeTexImage):
return link.from_node
for socket in link.from_node.inputs.values():
image = find_shader_image_from_shader_socket(shader_socket=socket, max_hops=max_hops - 1)
if image is not None:
return image
return None
def get_texture_transform_from_texture_node(texture_node):
if not isinstance(texture_node, bpy.types.ShaderNodeTexImage):
return None
mapping_socket = texture_node.inputs["Vector"]
if len(mapping_socket.links) == 0:
return None
mapping_node = mapping_socket.links[0].from_node
if not isinstance(mapping_node, bpy.types.ShaderNodeMapping):
return None
if mapping_node.vector_type not in ["TEXTURE", "POINT", "VECTOR"]:
gltf2_io_debug.print_console("WARNING",
"Skipping exporting texture transform because it had type " +
mapping_node.vector_type + "; recommend using POINT instead"
)
return None
rotation_0, rotation_1 = mapping_node.inputs['Rotation'].default_value[0], mapping_node.inputs['Rotation'].default_value[1]
if rotation_0 or rotation_1:
# TODO: can we handle this?
gltf2_io_debug.print_console("WARNING",
"Skipping exporting texture transform because it had non-zero "
"rotations in the X/Y direction; only a Z rotation can be exported!"
)
return None
mapping_transform = {}
mapping_transform["offset"] = [mapping_node.inputs['Location'].default_value[0], mapping_node.inputs['Location'].default_value[1]]
mapping_transform["rotation"] = mapping_node.inputs['Rotation'].default_value[2]
mapping_transform["scale"] = [mapping_node.inputs['Scale'].default_value[0], mapping_node.inputs['Scale'].default_value[1]]
if mapping_node.vector_type == "TEXTURE":
# This means use the inverse of the TRS transform.
def inverted(mapping_transform):
offset = mapping_transform["offset"]
rotation = mapping_transform["rotation"]
scale = mapping_transform["scale"]
# Inverse of a TRS is not always a TRS. This function will be right
# at least when the following don't occur.
if abs(rotation) > 1e-5 and abs(scale[0] - scale[1]) > 1e-5:
return None
if abs(scale[0]) < 1e-5 or abs(scale[1]) < 1e-5:
return None
new_offset = Matrix.Rotation(-rotation, 3, 'Z') @ Vector((-offset[0], -offset[1], 1))
new_offset[0] /= scale[0]; new_offset[1] /= scale[1]
return {
"offset": new_offset[0:2],
"rotation": -rotation,
"scale": [1/scale[0], 1/scale[1]],
}
mapping_transform = inverted(mapping_transform)
if mapping_transform is None:
gltf2_io_debug.print_console("WARNING",
"Skipping exporting texture transform with type TEXTURE because "
"we couldn't convert it to TRS; recommend using POINT instead"
)
return None
elif mapping_node.vector_type == "VECTOR":
# Vectors don't get translated
mapping_transform["offset"] = [0, 0]
texture_transform = texture_transform_blender_to_gltf(mapping_transform)
if all([component == 0 for component in texture_transform["offset"]]):
del(texture_transform["offset"])
if all([component == 1 for component in texture_transform["scale"]]):
del(texture_transform["scale"])
if texture_transform["rotation"] == 0:
del(texture_transform["rotation"])
if len(texture_transform) == 0:
return None
return texture_transform
def get_node(data_path):
"""Return Blender node on a given Blender data path."""
if data_path is None:
return None
index = data_path.find("[\"")
if (index == -1):
return None
node_name = data_path[(index + 2):]
index = node_name.find("\"")
if (index == -1):
return None
return node_name[:(index)]
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