glTF exporter: STEP interpolation if there is only 1 keyframe

1 files changed, 3 insertions, 1 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_samplers.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_samplers.py
index 4fedd469..dc3b6d30 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_samplers.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_samplers.py
@@ -89,7 +89,9 @@ def __gather_interpolation(channels: typing.Tuple[bpy.types.FCurve],
     if gltf2_blender_gather_animation_sampler_keyframes.needs_baking(blender_object_if_armature,
                                                                      channels,
                                                                      export_settings):
-        return 'STEP'
+        max_keyframes = max([len(ch.keyframe_points) for ch in channels])
+        # If only single keyframe revert to STEP
+        return 'STEP' if max_keyframes < 2 else 'LINEAR'
 
     blender_keyframe = channels[0].keyframe_points[0]