[URP] + [Screen Space - Camera] mode has limitations with Orthographic Camera Size

[jason-sylo]

Describe the bug
In [URP] + [Screen Space - Camera] mode, problems occur when Orthographic Camera Size is 20 or more, or very small like 1.

To Reproduce
Steps to reproduce the behavior:
Common setup

1. Install Unity 2022.3.16f1 + URP 14.0.9 and create a simple 2D project (Empty is OK)
2. Open Package Manager and install UI Soft Mask 3.2.4
3. Import UI Soft Mask Demo
4. Run the UI Soft Mask Demo and toggle 'Camera' button in Canvas Renderer Mode (to apply Screen Space - Camera)

Issue A:

1. In the currently running UI Soft Mask Demo + Screen Space - Camera applied state, set the Main Camera to
   Orthographic in the Inspector and change Size to 20 or more
2. SoftMasks are not rendered (all objects with SoftMask Component and Masking Mode = 'Soft Masking' are affected)

Issue B:

1. In the currently running UI Soft Mask Demo + Screen Space - Camera applied state, set the Main Camera to Orthographic and change Size to 1
2. Slowly drag the ScrollRect
3. Heavy aliasing occurs when SoftMask positions change (all objects with SoftMask Component and Masking Mode = 'Soft Masking' are affected)

Expected behavior
SoftMask should work correctly in Screen Space - Camera mode.
If limited by Orthographic Camera Size, the limitation should be notified or made configurable.

Screenshots

Environment (please complete the following information):

• Version 3.2.4
• Platform: Editor(Windows)
• Unity version: 2022.3.16f1
• Build options: Universal RP 14.0.9, UI Soft Mask Demo

Additional context
The aliasing in Issue B gets smaller when Orthographic Camera Size is close to 19.9.
I found these issues after upgrading from SoftMask 1.0.2 to 3.2.4.
Currently I set Orthographic Camera Size to 19 as a workaround.
There were no such problems in 1.0.2 even with a large Orthographic Camera Size.

[mob-sakai]

Thank you for your reporting!

[mob-sakai]

Sorry for my late reply.
Could you please attach a minimal project (included Assets, Packages and ProjectSettings directories) that reproduces the issue?
Of course, you don't need to include any secret assets from your project. Feel free to use free assets instead.

[jason-sylo]

@mob-sakai Sorry, I missed a critical detail in the reproduction steps.
There is no issue with Orthographic Size 100 or 1000 on a URP Base Camera.
The problem only occurs when an Overlay Camera is attached to the Base Camera, and that Overlay Camera is orthographic with size ≥ 20.
I've attached a minimal project to reproduce this.
Also, with orthographic size = 1, jittering always occurs, regardless of configuration.

Note: Although I accidentally updated to Unity 2022.3.60f1, the issue still reproduces under the same conditions.

SoftMaskTest - Orthographic Camera in Overlay Mode.zip

[jason-sylo]

@mob-sakai Does the issue reproduce with the attached sample?
Has there been any update since then?