Initial commit of glTF 2.0 importer/exporter

Official Khronos Group Blender glTF 2.0 importer and exporter.

glTF specification: https://github.com/KhronosGroup/glTF
The upstream repository can be found here:
https://github.com/KhronosGroup/glTF-Blender-IO

Reviewed By: Bastien, Campbell

Differential Revision: https://developer.blender.org/D3929

1 files changed, 217 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitive_attributes.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitive_attributes.py
new file mode 100755
index 00000000..bd1294cd
--- /dev/null
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitive_attributes.py
@@ -0,0 +1,217 @@
+# 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.
+
+from . import gltf2_blender_export_keys
+from io_scene_gltf2.io.com import gltf2_io
+from io_scene_gltf2.io.com import gltf2_io_constants
+from io_scene_gltf2.io.com import gltf2_io_debug
+from io_scene_gltf2.io.exp import gltf2_io_binary_data
+from io_scene_gltf2.blender.exp import gltf2_blender_utils
+
+
+def gather_primitive_attributes(blender_primitive, export_settings):
+    """
+    Gathers the attributes, such as POSITION, NORMAL, TANGENT from a blender primitive.
+
+    :return: a dictionary of attributes
+    """
+    attributes = {}
+    attributes.update(__gather_position(blender_primitive, export_settings))
+    attributes.update(__gather_normal(blender_primitive, export_settings))
+    attributes.update(__gather_tangent(blender_primitive, export_settings))
+    attributes.update(__gather_texcoord(blender_primitive, export_settings))
+    attributes.update(__gather_colors(blender_primitive, export_settings))
+    attributes.update(__gather_skins(blender_primitive, export_settings))
+    return attributes
+
+
+def __gather_position(blender_primitive, export_settings):
+    position = blender_primitive["attributes"]["POSITION"]
+    componentType = gltf2_io_constants.ComponentType.Float
+    return {
+        "POSITION": gltf2_io.Accessor(
+            buffer_view=gltf2_io_binary_data.BinaryData.from_list(position, componentType),
+            byte_offset=None,
+            component_type=componentType,
+            count=len(position) // gltf2_io_constants.DataType.num_elements(gltf2_io_constants.DataType.Vec3),
+            extensions=None,
+            extras=None,
+            max=gltf2_blender_utils.max_components(position, gltf2_io_constants.DataType.Vec3),
+            min=gltf2_blender_utils.min_components(position, gltf2_io_constants.DataType.Vec3),
+            name=None,
+            normalized=None,
+            sparse=None,
+            type=gltf2_io_constants.DataType.Vec3
+        )
+    }
+
+
+def __gather_normal(blender_primitive, export_settings):
+    if export_settings[gltf2_blender_export_keys.NORMALS]:
+        normal = blender_primitive["attributes"]['NORMAL']
+        return {
+            "NORMAL": gltf2_io.Accessor(
+                buffer_view=gltf2_io_binary_data.BinaryData.from_list(normal, gltf2_io_constants.ComponentType.Float),
+                byte_offset=None,
+                component_type=gltf2_io_constants.ComponentType.Float,
+                count=len(normal) // gltf2_io_constants.DataType.num_elements(gltf2_io_constants.DataType.Vec3),
+                extensions=None,
+                extras=None,
+                max=None,
+                min=None,
+                name=None,
+                normalized=None,
+                sparse=None,
+                type=gltf2_io_constants.DataType.Vec3
+            )
+        }
+    return {}
+
+
+def __gather_tangent(blender_primitive, export_settings):
+    if export_settings[gltf2_blender_export_keys.TANGENTS]:
+        if blender_primitive["attributes"].get('TANGENT') is not None:
+            tangent = blender_primitive["attributes"]['TANGENT']
+            return {
+                "TANGENT": gltf2_io.Accessor(
+                    buffer_view=gltf2_io_binary_data.BinaryData.from_list(
+                        tangent, gltf2_io_constants.ComponentType.Float),
+                    byte_offset=None,
+                    component_type=gltf2_io_constants.ComponentType.Float,
+                    count=len(tangent) // gltf2_io_constants.DataType.num_elements(gltf2_io_constants.DataType.Vec4),
+                    extensions=None,
+                    extras=None,
+                    max=None,
+                    min=None,
+                    name=None,
+                    normalized=None,
+                    sparse=None,
+                    type=gltf2_io_constants.DataType.Vec4
+                )
+            }
+
+    return {}
+
+
+def __gather_texcoord(blender_primitive, export_settings):
+    attributes = {}
+    if export_settings[gltf2_blender_export_keys.TEX_COORDS]:
+        tex_coord_index = 0
+        tex_coord_id = 'TEXCOORD_' + str(tex_coord_index)
+        while blender_primitive["attributes"].get(tex_coord_id) is not None:
+            tex_coord = blender_primitive["attributes"][tex_coord_id]
+            attributes[tex_coord_id] = gltf2_io.Accessor(
+                buffer_view=gltf2_io_binary_data.BinaryData.from_list(
+                    tex_coord, gltf2_io_constants.ComponentType.Float),
+                byte_offset=None,
+                component_type=gltf2_io_constants.ComponentType.Float,
+                count=len(tex_coord) // gltf2_io_constants.DataType.num_elements(gltf2_io_constants.DataType.Vec2),
+                extensions=None,
+                extras=None,
+                max=None,
+                min=None,
+                name=None,
+                normalized=None,
+                sparse=None,
+                type=gltf2_io_constants.DataType.Vec2
+            )
+            tex_coord_index += 1
+            tex_coord_id = 'TEXCOORD_' + str(tex_coord_index)
+    return attributes
+
+
+def __gather_colors(blender_primitive, export_settings):
+    attributes = {}
+    if export_settings[gltf2_blender_export_keys.COLORS]:
+        color_index = 0
+        color_id = 'COLOR_' + str(color_index)
+        while blender_primitive["attributes"].get(color_id) is not None:
+            internal_color = blender_primitive["attributes"][color_id]
+            attributes[color_id] = gltf2_io.Accessor(
+                buffer_view=gltf2_io_binary_data.BinaryData.from_list(
+                    internal_color, gltf2_io_constants.ComponentType.Float),
+                byte_offset=None,
+                component_type=gltf2_io_constants.ComponentType.Float,
+                count=len(internal_color) // gltf2_io_constants.DataType.num_elements(gltf2_io_constants.DataType.Vec4),
+                extensions=None,
+                extras=None,
+                max=None,
+                min=None,
+                name=None,
+                normalized=None,
+                sparse=None,
+                type=gltf2_io_constants.DataType.Vec4
+            )
+            color_index += 1
+            color_id = 'COLOR_' + str(color_index)
+    return attributes
+
+
+def __gather_skins(blender_primitive, export_settings):
+    attributes = {}
+    if export_settings[gltf2_blender_export_keys.SKINS]:
+        bone_index = 0
+        joint_id = 'JOINTS_' + str(bone_index)
+        weight_id = 'WEIGHTS_' + str(bone_index)
+        while blender_primitive["attributes"].get(joint_id) and blender_primitive["attributes"].get(weight_id):
+            if bone_index >= 4:
+                gltf2_io_debug.print_console("WARNING", "There are more than 4 joint vertex influences."
+                                                        "Consider to apply blenders Limit Total function.")
+                # TODO: add option to stop after 4
+                # break
+
+            # joints
+            internal_joint = blender_primitive["attributes"][joint_id]
+            joint = gltf2_io.Accessor(
+                buffer_view=gltf2_io_binary_data.BinaryData.from_list(
+                    internal_joint, gltf2_io_constants.ComponentType.UnsignedShort),
+                byte_offset=None,
+                component_type=gltf2_io_constants.ComponentType.UnsignedShort,
+                count=len(internal_joint) // gltf2_io_constants.DataType.num_elements(gltf2_io_constants.DataType.Vec4),
+                extensions=None,
+                extras=None,
+                max=None,
+                min=None,
+                name=None,
+                normalized=None,
+                sparse=None,
+                type=gltf2_io_constants.DataType.Vec4
+            )
+            attributes[joint_id] = joint
+
+            # weights
+            internal_weight = blender_primitive["attributes"][weight_id]
+            weight = gltf2_io.Accessor(
+                buffer_view=gltf2_io_binary_data.BinaryData.from_list(
+                    internal_weight, gltf2_io_constants.ComponentType.Float),
+                byte_offset=None,
+                component_type=gltf2_io_constants.ComponentType.Float,
+                count=len(internal_weight) // gltf2_io_constants.DataType.num_elements(
+                    gltf2_io_constants.DataType.Vec4),
+                extensions=None,
+                extras=None,
+                max=None,
+                min=None,
+                name=None,
+                normalized=None,
+                sparse=None,
+                type=gltf2_io_constants.DataType.Vec4
+            )
+            attributes[weight_id] = weight
+
+            bone_index += 1
+            joint_id = 'JOINTS_' + str(bone_index)
+            weight_id = 'WEIGHTS_' + str(bone_index)
+    return attributes
+