[Sappykun]

See https://forums.alliedmods.net/showthread.php?p=2746552 for a plugin that accomplishes this.

As for the original glitch I encountered, here's what happened:

The playerdecal material sizes are cached based on the previous VTF used as the player's spray. Normally, the size is clamped to 64x64 hammer units, and the VTF file referenced in the playerlogo01.vmt file is a 64x64 blood texture.
This clamping does not occur when the VTF in question is below 128x128 pixels - and the map before, I just happened to use a spray that was 125x125 pixels in size. When the new map was loaded, my client (and the clients of the other players at the time) re-cached the material using the dimensions of the 125x125 VTF from the previous map, resulting in a blown-up spray.


Original post:

Spoiler

TL;DR I want to increase the default size of player sprays from 64x64 Hammer units to another size. If possible, I would like to be able to change the size of a spray on-the-fly, and maybe even make it configurable per person (let admins with a specific flag have bigger sprays, etc). How would I go about doing this using Sourcemod?

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I was helping a friend set up his TF2 server this weekend. On one of the maps, I haphazardly sprayed on a wall, and my spray came out at double the usual size.

Spoiler for questionable content (it's a Gardevoir with tig ol' bitties, no nudity).

Spoiler

Here's the source if that's your thing.

The spray was visible by the other two players on this server, so I don't think it was strictly a client-side glitch. Since this map has dev texture walls, and each square is 16 hammer units, you can easily tell that the Gardevoir spray is 128x128 units, while the other sprays are limited to 64x64, the default size. We switched maps to try and see if this bug persisted, but my spray went back to the regular size, and we have not been able to replicate it since.

I know now it's possible to change the size of an individual player spray, but I want to figure out how to do this more reliably, and possibly figure out how to change the size dynamically via commands. I have been looking at other spray-based plugins such as SprayTrace and Super Spray Handler, but my SourcePawn knowledge is basic and I am still researching how these plugins interact with player sprays and if any of their methods actually change how the spray is created or placed.

If possible, I'd like to know:

• What kind of entity is created when a spray is placed? Is the spray just an instance of an info_overlay entity? Can I use the info_overlay_accessor somehow to manipulate player sprays?
• Could resizing a player decal be done using the base Sourcemod hooks, or would I need something like DHooks to create a new hook for player decal manipulation, or would I even need to go as far as to make an entirely new extension?

Thanks for the info.

[Sappykun]

I've been doing some research into how other plugins handle sprays, and how the Source engine handles sprays itself.

Most plugins use this block of code to spray a player's spray (taken from here):

TE_Start("Player Decal");
TE_WriteVector("m_vecOrigin", fClientEyeViewPoint);
TE_WriteNum("m_nPlayer", iClient);
TE_SendToAll();

where fClientEyeViewPoint is the origin point and iClient is the client index. However, I don't see a way to manipulate how the spray is displayed from here.

In the Source 2013 multiplayer code, when a player uses impulse 201, the engine does the following steps:

1. Find who's placing a spray
2. See if they have a spray set up
3. Generate a hashed filename (some sort of hex value) based on the filename and player
4. Get the logo based on this hashed filename (either in materials/temp or download/user_custom)
5. Apply a VMT material to it (materials/decals/playerlogoXX.vmt)
6. Display it in the world

However, VMT files don't determine how large a decal is; based on the info_overlay entity in Hammer, each overlay has four vectors (uv0, uv1, uv2, uv3) that determine how the spray is projected onto the brush/displacement based on its origin point.

The C_TEPlayerDecal class only seems to expose 3 values: the player ID, the spray's origin point, and the entity ID, m_nEntity.

With this information, I can see two ways of achieving my goals:

1. Use m_nEntity to manipulate the uv points of the spray before it's placed, increasing its size. This would probably be the best solution, but how would I get the entity ID of the spray before it's placed? Is it even possible to change the decal's properties given its entity index?
2. Use a generic BSP decal with the player's spray based on the hashed filename. I can check the client's value of cl_logofile, get the filename, generate the hash myself, then use that to display the logo in the world. Is this a feasible approach? Is it possible?

Am I on to something, or am I misunderstanding how Source handles player sprays? Any advice would be appreciated.