Merge pull request #347 from Unity-Technologies/tutorial_patch

added note about MSAA and blank images

Author: mkamalza

com.unity.perception/Documentation~/Tutorial/Phase1.md

@@ -391,6 +391,8 @@ In this folder, you will find a few types of data, depending on your `Perception
 
 The output dataset includes a variety of information about different aspects of the active sensors in the Scene (currently only one), as well as the ground-truth generated by all active Labelers. [This page](https://github.com/Unity-Technologies/com.unity.perception/blob/master/com.unity.perception/Documentation%7E/Schema/Synthetic_Dataset_Schema.md) provides a comprehensive explanation on the schema of this dataset. We strongly recommend having a look at the page once you have completed this tutorial.
 
+> :information_source: Are the RGB images blank? This may be a bug. When using URP in OSX, having MSAA enabled on the camera may cause the output RGB images to be blank. As a workaround, you can disable MSAA and use FXAA instead, until the issue is fixed.
+
 * **:green_circle: Action**: To get a quick feel of how the data is stored, open the folder whose name starts with `Dataset`, then open the file named `captures_000.json`. This file contains the output from `BoundingBox2DLabeler`. The `captures` array contains the position and rotation of the sensor (camera), the position and rotation of the ego (sensor group, currently only one), and the annotations made by `BoundingBox2DLabeler` for all visible objects defined in its label configuration. For each visible object, the annotations include:
 * `label_id`: The numerical id assigned to this object's label in the Labeler's label configuration
 * `label_name`: The object's label, e.g. `candy_minipralines_lindt`