Camera Fov Y exported wrong.

[voidstorm]

Describe the bug
Camera y-fov export is wrong. Instead of exporting it in radians it seems its exported as degrees/100. E.g a fov of 39.9 is exported as 0.3999 instead of 0.69. The erratic behavior is also apparent when re-importing the previously imported gltf file. If you re-import, the fovy that was exported as 39.9 becomes now 22.9 instead.
Changing lens units from/to fov or mm also does not change behavior.

To Reproduce
Steps to reproduce the behavior:
Create a camera, export gltf including cameras. Check json -> value will be wrong. To further confirm, re-import gltf, now the imported camera will also have a wrong fov.

Expected behavior
E.g 39.9 should export as 6.999 radians

Version

• OS: Win11
• Blender Version 4.2

[julienduroure]

Hello,

Exporting / Importing camera yfov is not as simple as field of view conversion, as it require also aspect ratio (so render size) and sensor fit

We can find the conversion used here:

glTF-Blender-IO/addons/io_scene_gltf2/blender/com/gltf2_blender_conversion.py

Line 201 in 93db353

def yvof_blender_to_gltf(angle, width, height, sensor_fit):

At import, we currently don't fully manage aspect ratio / render size :

glTF-Blender-IO/addons/io_scene_gltf2/blender/imp/gltf2_blender_camera.py

Line 64 in 93db353

cam.angle_y = pycamera.perspective.yfov