How do I put a Bitmap in the screen as a cutscene?

I believe you want the following instead:

script 02 (void)
{
	SetFont("BOSSBACK");
	HudMessage(s:"A"; HUDMSG_PLAIN, 0, 0, 0.1, 0.8, 3.7);
}

I'm assuming ZDoom because you can't do that in Vanilla. Just follow this:

https://zdoom.org/wiki/HudMessage#Displaying_images

46 minutes ago, DeliriuS said:

Uh, yeah. I tried but it seems that my script is having an error, "indentifier has not been declared". 

How do I solve this error?

An identifier hasn't been declared. Declare it.

Post the script, let us look at it. Also, check if the first line of the script is #include "zcommon.acs"

13 hours ago, Albertoni said:

I'm assuming ZDoom because you can't do that in Vanilla. Just follow this:

https://zdoom.org/wiki/HudMessage#Displaying_images

Uh, yeah. I tried but it seems that my script is having an error, "indentifier has not been declared". 

How do I solve this error?

18 minutes ago, Albertoni said:

An identifier hasn't been declared. Declare it.

 

Post the script, let us look at it. Also, check if the first line of the script is #include "zcommon.acs"

script 02 (void)
{
	SetFont("PICTURE");
	HudMessage(s:"A"; BOSSBACK, 0, 0, 0.1, 0.8, 3.7);
}

The error: BOSSBACK: Identifier has not been declared.

2 hours ago, Albertoni said:

I believe you want the following instead:

 

script 02 (void)
{
	SetFont("BOSSBACK");
	HudMessage(s:"A"; HUDMSG_PLAIN, 0, 0, 0.1, 0.8, 3.7);
}

 

Thanks man! It worked.

5 hours ago, Albertoni said:

I believe you want the following instead:

 

script 02 (void)
{
	SetFont("BOSSBACK");
	HudMessage(s:"A"; HUDMSG_PLAIN, 0, 0, 0.1, 0.8, 3.7);
}

 

But, how I make it fill up the entire screen? It's only in a part of the screen...

EDIT: SOLVED IT, I just used "SetHudSize(320, 240, FALSE);".