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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
from math import sin, cos
def texture_transform_blender_to_gltf(mapping_transform):
"""
Converts the offset/rotation/scale from a Mapping node applied in Blender's
UV space to the equivalent KHR_texture_transform.
"""
offset = mapping_transform.get('offset', [0, 0])
rotation = mapping_transform.get('rotation', 0)
scale = mapping_transform.get('scale', [1, 1])
return {
'offset': [
offset[0] - scale[1] * sin(rotation),
1 - offset[1] - scale[1] * cos(rotation),
],
'rotation': rotation,
'scale': [scale[0], scale[1]],
}
def texture_transform_gltf_to_blender(texture_transform):
"""
Converts a KHR_texture_transform into the equivalent offset/rotation/scale
for a Mapping node applied in Blender's UV space.
"""
offset = texture_transform.get('offset', [0, 0])
rotation = texture_transform.get('rotation', 0)
scale = texture_transform.get('scale', [1, 1])
return {
'offset': [
offset[0] + scale[1] * sin(rotation),
1 - offset[1] - scale[1] * cos(rotation),
],
'rotation': rotation,
'scale': [scale[0], scale[1]],
}
def get_target(property):
return {
"delta_location": "translation",
"delta_rotation_euler": "rotation",
"location": "translation",
"rotation_axis_angle": "rotation",
"rotation_euler": "rotation",
"rotation_quaternion": "rotation",
"scale": "scale",
"value": "weights"
}.get(property)
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