Vignettes

[CesiumBen]

Summary

This PR covers the technical aspects of vignettes.

Author checklist

• Tutorial for #6
• Has the new tutorial been integrated into the main level? Yes
• Has a new section of the readme been added for this tutorial? Yes
• Have you done a full self-review of the code and blueprints? Yes
• Have you tagged a primary reviewer? Yes
• Are there any remaining tasks to do or blocking questions to answer before we can merge this? No

Testing plan

Test the main level and the vignette level, movements, snap rotation and teleportation should cause the vignette to activate. While both levels are identical at this point. The main level pawn will continue to grow with features while the vignette pawn in the vignette level is locked as such going forward, simply to isolate movement functionality and vignettes.

Reminders for reviewers

Thank you for taking the time to review this PR. By approving a PR you are taking as much responsibility for these changes as the author. Please keep these points in mind throughout the review process:

• Review and run all parts of the test plan on this branch and verify it matches expectations.
• Review the code and make sure you do not have any remaining questions or concerns. You should understand why this code change fixes the issue and agree that it's the best approach to doing so.
• Review the automated tests and make sure there are no missing tests or edge cases.
• When you feel this is ready bump it to a second reviewer or merge.

[xuelongmu]

Did video call code review with Ben. Remaining items:

• Test that the new map range function
• Test new decay time implementation
• Move min/max radius params into material
• Check whether blink should be used when snap rotating.

OK to self merge after these are addressed.

[CesiumBen]

Test that the new map range function - Is working as expected Test new decay time implementation - Works and can clearly see the vignette fading. Move min/max radius params into material - I've adjusted that and works well Check whether blink should be used when snap rotating. - Blink should be used when rotating

Thanks @xuelongmu! All has been updated and I'm merging.