# Changes in camera.py to fix fixed frame option in 3D

[kolibril13]

There was an issue with z_index and add_fixed_in_frame_mobjects (#264). This change will fix it.
Can be tested with

from manim import *
class Text3D(ThreeDScene):
    def construct(self):
        axes = ThreeDAxes()
        self.set_camera_orientation(phi=75 * DEGREES,theta=-45*DEGREES)
        text=TextMobject("This is a 3D text")
        self.add_fixed_in_frame_mobjects(text.to_corner(UL))
        self.add(axes)
        self.add(text)
        self.wait()

from pathlib import Path
if __name__ == "__main__":
    script = f"{Path(__file__).resolve()}"
    os.system(f"manim  -p -s  " + script )

[leotrs]

Can you please tell us what was the bug that this is fixing?

[kolibril13]

Something went wrong in the sort method, see #264 .
I changed the line @PgBiel suggested and no error message anymore. But I did not do further testing.