Update sensor size

[TheMr33]

Describe your feature request

I have the specifications of a camera (sensor size in mm, focal distance, field of view etc…) and I would like to create a virtual camera that would mirror those parameters. However it does not seem possible to update the sensor size using the camera api. As a result, even if the field of view is correct, the parameters of the focal length no longer match the one of the original camera.

Describe a possible solution

A simple solution would be to add a function like:

def set_sensor_size(cam: bpy.types.Camera, sensor_width_in_mm: float = None, sensor_height_in_mm: float = None):
    """ Update the sensor size of the camera.

    :param cam: The camera object.
    :param sensor_width_in_mm: width of the sensor in mm.
    :param sensor_height_in_mm: height of the sensor in mm.
    """
    if sensor_width_in_mm is not None:
        cam.sensor_width = sensor_width_in_mm
    if sensor_height_in_mm is not None:
        cam.sensor_height = sensor_height_in_mm

and call this function at the beginning of set_intrinsics_from_K_matrix and set_intrinsics_from_blender_params (and maybe set_resolution?)

[cornerfarmer]

Hey @TheMr33,

looks good, feel free to open a pull request. However I would not add sensor size to the set_intrinsics_from_K_matrix function, as it does not really make sense there.