Fix ped shadows remaining visible at zero alpha

[Dryxio]

Summary

Fix ped shadows remaining visible when the ped's effective alpha is 0.

Before

After

Motivation

An invisible ped could still be located by its shadow when using:

setElementAlpha(ped, 0)

The shadow should disappear together with the ped and return normally when its alpha is restored.

Test plan

Tested in game on the local player:

ped-shadow-alpha-player-test.zip

1. Disable dynamic ped shadows to use blob shadows
2. Use /pedshadow 0
3. Confirm the player and blob shadow disappear
4. Use /pedshadow 255
5. Confirm the player and shadow return
6. Enable dynamic ped shadows and repeat the same test

Also verified that restoring alpha to 255 recreates the shadow normally.

Checklist

• Your code should follow the coding guidelines.
• Smaller pull requests are easier to review. If your pull request is beefy, your pull request should be reviewable commit-by-commit.

[lopezloo]

Should we fix issues like this? Isn't it adding unnecessary complexity? Interiors simply weren't implemented for such features. After all, the main interiorless thing is element collision. If someone wants to hide everything then he should use dimensions.

[dmi7ry]

Should we fix issues like this? Isn't it adding unnecessary complexity? Interiors simply weren't implemented for such features. After all, the main interiorless thing is element collision. If someone wants to hide everything then he should use dimensions.

For example, this is useful when admins are invisible. Other players can see the admin's location by the shadow.

[Dryxio]

Should we fix issues like this? Isn't it adding unnecessary complexity? Interiors simply weren't implemented for such features. After all, the main interiorless thing is element collision. If someone wants to hide everything then he should use dimensions.

I don’t get it. If a player is intentionally made invisible, shouldn’t their shadow be invisible too?

[lopezloo]

My bad, I thought this PR was about element interior, not opacity.

However, IMO it would be best to also have an scripting function to control whether element casts shadows.

[FileEX]

What about vehicle shadows?

[Dryxio]

What about vehicle shadows?

I’ll open a separate PR for vehicle shadows if that’s fine