Rasterization test utils.

PiperOrigin-RevId: 363006386

tensorflow_graphics/rendering/tests/rasterization_test_utils.py

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+# Copyright 2020 The TensorFlow Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Util functions for rasterization tests."""
+
+import numpy as np
+
+from tensorflow_graphics.geometry.transformation import look_at
+from tensorflow_graphics.rendering.camera import perspective
+
+
+def make_perspective_matrix(image_width=None, image_height=None):
+  """Generates perspective matrix for a given image size.
+
+  Args:
+    image_width: int representing image width.
+    image_height: int representing image height.
+
+  Returns:
+    Perspective matrix, tensor of shape [4, 4].
+
+  Note: Golden tests require image size to be fixed and equal to the size of
+  golden image examples.
+  """
+
+  field_of_view = (40 * np.math.pi / 180,)
+  near_plane = (0.01,)
+  far_plane = (10.0,)
+  return perspective.right_handed(field_of_view,
+                                  (float(image_width) / float(image_height),),
+                                  near_plane, far_plane)
+
+
+def make_look_at_matrix(
+    camera_origin=(0.0, 0.0, 0.0), look_at_point=(0.0, 0.0, 0.0)):
+  camera_up = (0.0, 1.0, 0.0)
+  return look_at.right_handed(camera_origin, look_at_point, camera_up)