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, 124 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_cameras.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_cameras.py
new file mode 100755
index 00000000..b09092ca
--- /dev/null
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_cameras.py
@@ -0,0 +1,124 @@
+# 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.blender.exp.gltf2_blender_gather_cache import cached
+from io_scene_gltf2.io.com import gltf2_io
+
+import bpy
+import math
+
+
+@cached
+def gather_camera(blender_object, export_settings):
+    if not __filter_camera(blender_object, export_settings):
+        return None
+
+    return gltf2_io.Camera(
+        extensions=__gather_extensions(blender_object, export_settings),
+        extras=__gather_extras(blender_object, export_settings),
+        name=__gather_name(blender_object, export_settings),
+        orthographic=__gather_orthographic(blender_object, export_settings),
+        perspective=__gather_perspective(blender_object, export_settings),
+        type=__gather_type(blender_object, export_settings)
+    )
+
+
+def __filter_camera(blender_object, export_settings):
+    if blender_object.type != 'CAMERA':
+        return False
+    if not __gather_type(blender_object, export_settings):
+        return False
+
+    return True
+
+
+def __gather_extensions(blender_object, export_settings):
+    return None
+
+
+def __gather_extras(blender_object, export_settings):
+    return None
+
+
+def __gather_name(blender_object, export_settings):
+    return blender_object.data.name
+
+
+def __gather_orthographic(blender_object, export_settings):
+    if __gather_type(blender_object, export_settings) == "orthographic":
+        orthographic = gltf2_io.CameraOrthographic(
+            extensions=None,
+            extras=None,
+            xmag=None,
+            ymag=None,
+            zfar=None,
+            znear=None
+        )
+        blender_camera = blender_object.data
+
+        orthographic.xmag = blender_camera.ortho_scale
+        orthographic.ymag = blender_camera.ortho_scale
+
+        orthographic.znear = blender_camera.clip_start
+        orthographic.zfar = blender_camera.clip_end
+
+        return orthographic
+    return None
+
+
+def __gather_perspective(blender_object, export_settings):
+    if __gather_type(blender_object, export_settings) == "perspective":
+        perspective = gltf2_io.CameraPerspective(
+            aspect_ratio=None,
+            extensions=None,
+            extras=None,
+            yfov=None,
+            zfar=None,
+            znear=None
+        )
+        blender_camera = blender_object.data
+
+        width = bpy.context.scene.render.pixel_aspect_x * bpy.context.scene.render.resolution_x
+        height = bpy.context.scene.render.pixel_aspect_y * bpy.context.scene.render.resolution_y
+        perspective.aspectRatio = width / height
+
+        if width >= height:
+            if blender_camera.sensor_fit != 'VERTICAL':
+                perspective.yfov = 2.0 * math.atan(math.tan(blender_camera.angle * 0.5) / perspective.aspectRatio)
+            else:
+                perspective.yfov = blender_camera.angle
+        else:
+            if blender_camera.sensor_fit != 'HORIZONTAL':
+                perspective.yfov = blender_camera.angle
+            else:
+                perspective.yfov = 2.0 * math.atan(math.tan(blender_camera.angle * 0.5) / perspective.aspectRatio)
+
+        perspective.znear = blender_camera.clip_start
+
+        if not export_settings[gltf2_blender_export_keys.CAMERA_INFINITE]:
+            perspective.zfar = blender_camera.clip_end
+
+        return perspective
+    return None
+
+
+def __gather_type(blender_object, export_settings):
+    camera = blender_object.data
+    if camera.type == 'PERSP':
+        return "perspective"
+    elif camera.type == 'ORTHO':
+        return "orthographic"
+    return None
+