docstr: Tests distortion_factor at zero distortion coefficient.
docstr_tok: ["Tests","distortion_factor","at","zero","distortion","coefficient","."]
code: def test_distortion_factor_preset_zero_distortion_coefficient(self):
      """Tests distortion_factor at zero distortion coefficient."""
      squared_radii = _get_random_radii() * 2.0
  
      distortion, mask = quadratic_radial_distortion.distortion_factor(
          squared_radii, 0.0
      )
  
      with self.subTest(name="distortion"):
          self.assertAllClose(tf.ones_like(squared_radii), distortion)
  
      # No overflow when distortion_coefficient = 0.0.
      with self.subTest(name="mask"):
          self.assertAllInSet(mask, (False,))
  
imports: from absl.testing import parameterized
  import numpy
  import tensorflow
  from tensorflow_graphics.rendering.camera import quadratic_radial_distortion
  from tensorflow_graphics.util import test_case
label_desc: Use image node_id 2 for calling the QuadraticRadialDistortionTest obj's underlying member method code with example usage: obj.test_distortion_factor_preset_zero_distortion_coefficient() without return types