[Code] Tracer Z-Coordinate Determination for Projectile

[RV-007]

Finally solved a way to make projectiles to determine if a tracer is above or below its coordinates. The key statement is the pre-calculus value stuff in the x|y|z velocity parameters.

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Code: Select all

/*
RevenantTracer
The seeking missile fired by a Revenant.
Whether it actually homes in on the Revenant's target or not is random (50% chance), this behavior is caused by the way A_Tracer was written. 
From their sprite names, it could be inferred they were originally planned to be the Mancubus' missiles.
http://zdoom.org/wiki/Classes:RevenantTracer

http://zdoom.org/wiki/Classes:RevenantTracer
http://zdoom.org/wiki/A_SeekerMissile
http://zdoom.org/wiki/A_JumpIfTargetInLOS
http://zdoom.org/wiki/A_ChangeVelocity
http://zdoom.org/wiki/A_Explode
http://zdoom.org/wiki/A_SpawnItemEx
*/
ACTOR Seeker_Grenade //: RevenantTracer
{	
	Game Doom
	SpawnID 53
	Radius 8 //11
	Height 6 //8
	Speed 10
	Damage (10*random(1,2)) //10
	Projectile
	+SEEKERMISSILE
	+RANDOMIZE
	SeeSound "seeker_grenade/sight"
	DeathSound "seeker_grenade/death"
	RenderStyle "Normal" //"Add"

	+SEEINVISIBLE
	+DONTMORPH
	+FLOORCLIP
	+BLOODSPLATTER
	+FORCERADIUSDMG
	+STEPMISSILE
	+ALWAYSFAST

	FastSpeed 20
	Decal "Grenade_Burns"
	Obituary "%o was hit by a spider drone's seeker grenade."

	States
	{
		Spawn:
			GREN A 2 A_SeekerMissile (0,15,SMF_LOOK|SMF_PRECISE,256,9999) //Bright A_Tracer
			GREN A 0 A_JumpIfTargetInLOS ("DiveA",0,JLOSF_PROJECTILE,64,0)
			Loop
		DiveA:
			GREN A 1 A_ChangeVelocity (Cos(Pitch)*0,0,Sin(Pitch)*20,CVF_RELATIVE)
			Goto Spawn
		Death:
			DCTU C 8 Bright A_Explode (64,64,0,1,0,0,0)
			DCTU D 7 Bright
			DCTU E 6 Bright
			DCTU F 5 Bright
			DCTU G 4 Bright
			DCTU H 3 Bright
			DCTU H 0 bright A_SpawnItemEx ("Cultist_Flame_Smoke",0,0,0,0,0,0,0,SXF_NOCHECKPOSITION,0)
			Stop
	}
}