Projectile smooth movement

[Doubleumc]

About the pull request

Changes the projectile's visual position to animate() across its projected path, providing smoother visuals, especially at higher client framerates.

Black squares: tiles actually traversed by the projectile object
Red line: visual path taken by the projectile
Purple marks: equidistant marks corresponding to number of traversed tiles (black squares)
Blue marks: closest points to center of traversed tiles (black squares)

The projectile's physical path (black squares) is unchanged. The system calculates how far along the physical path the projectile has travelled, draws a line from the start point to the end point (red line), then interpolates where along that line corresponds to that distance travelled (purple marks). This is slightly less accurate to the projectile's physical position than the closest point of the line (blue marks), but this slight potential offset is preferred for its smoother visuals.

This does not touch any code that actually effects the bullet's trajectory, this is purely cosmetic.

Tested:

• handheld guns
• scatter
• in-turf targeting (as visually consistent as the current implementation, at least)
• rockets
• plasma caster
• xeno spit

@morrowwolf : this is PR'd upstream, should be safe to testmerge though

Explain why it's good for the game

Smoother apparent movement for projectiles gives a more appealing look.

Testing Photographs and Procedure

Screenshots & Videos

https://streamable.com/h6esir

Changelog

🆑
code: projectiles smoothly animate their movement
/:cl:

[morrowwolf]

Seems fine from testing, just waiting til upstream merges