glTF import: add support of KHR_lights_punctual extension

1 files changed, 7 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/com/gltf2_blender_conversion.py b/io_scene_gltf2/blender/com/gltf2_blender_conversion.py
index 95fa292d..adc797ee 100755
--- a/io_scene_gltf2/blender/com/gltf2_blender_conversion.py
+++ b/io_scene_gltf2/blender/com/gltf2_blender_conversion.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 from mathutils import Matrix, Quaternion
+from math import sqrt
 
 def matrix_gltf_to_blender(mat_input):
     """Matrix from glTF format to Blender format."""
@@ -40,3 +41,9 @@ def scale_to_matrix(scale):
 
     return mat
 
+def correction_rotation():
+    """Correction of Rotation."""
+    # Correction is needed for lamps, because Yup2Zup is not written in vertices
+    # and lamps has no vertices :)
+    return Quaternion((sqrt(2)/2, -sqrt(2)/2, 0.0, 0.0)).to_matrix().to_4x4()
+