Silly Flak Grenade Physics

WheatPuppet · 25th Jan 2002, 10:41 PM

I was messing around with a flak-grenade type weapon and I was trying to figure out how to make it arc correctly, but I seem to be having trouble.
The flak grenade uses Physics="PHYS_Falling" in default properties to make it arc the way it does, but this arc is too extreme. Is there a way of making it arc only slightly over a long distance?
I'm a newbie coder, so I am not really sure what I can and can't do.

BTW- What exactly does the CalcDrawOffset function do. The name suggests that it might have to do with the discrepancy between "internal" viewpoint (the player view) and an "external" viewpoint. I can't be sure though.

Wormbo · 26th Jan 2002, 09:11 AM

Try this in the flak shell's Tick() function:

Code:

Velocity -= 0.3 * Region.Zone.ZoneGravity;

Adjust the 0.3 to fit your needs.

CalcDrawOffset() returns a vector for drawing the weapon in 1st person view (see Weapon.RenderOverlays() for details)

EasyRaider · 29th Jan 2002, 02:00 PM

That code would be frame rate dependant. A Timer() might be better.

(edit)
Or something like:

Code:

Acceleration = 0.5 * Region.Zone.ZoneGravity();

Wormbo · 30th Jan 2002, 08:12 AM

Quote:

Originally posted by EasyrideR_/\
That code would be frame rate dependant.

Oops, you're right. Actually it should be:

Code:

simulated function Tick(float DeltaTime)
{
    ...
    Velocity -= 0.3 * Region.Zone.ZoneGravity * DeltaTime;
}

Acceleration won't do anything because Physics is set to PHYS_Falling.

WheatPuppet · 30th Jan 2002, 04:34 PM

Umm, thanks.
How is it that you figure out all these esoteric class references?

Wormbo · 31st Jan 2002, 05:11 AM

What class references?
Region.Zone.ZoneGravity?

EasyRaider · 31st Jan 2002, 05:33 AM

Quote:

Originally posted by Wormbo
Acceleration won't do anything because Physics is set to PHYS_Falling.

I didn't know that. But you wouldn't want PHYS_Falling when you're doing your own gravity anyway.

Kangus · 31st Jan 2002, 08:41 AM

simple answer.... I shoulda said this ages ago.
Reduce the grenade's mass in its default properties, this should make its arc longer. The default mass for most things seems to be 100....

EasyRaider · 31st Jan 2002, 10:25 AM

You mean the native physics code makes less massive objects fall slower?

I refuse to believe the physics are that bad coded...

WheatPuppet · 1st Feb 2002, 09:00 AM

That would be awfully daft!
Remember... 9.8 m/s^2.... 9.8 m/s^2

EvilDrWong · 4th Feb 2002, 03:41 PM

heres an idea... why not just shoot the projectile a bit faster? it wont fall as short as it is now... or hows about giving it a bit of a boost on its Z axis velocity when its spawned? that should make it arc a bit further.

WheatPuppet · 4th Feb 2002, 05:04 PM

The problem with that is that I dont want to fire it faster. The flak shell moves horizontally at about the right rate, just it doesn't move vertically at the right rate. Trust me, I got the x/y movement about right.

25th Jan 2002, 10:41 PM	#1
WheatPuppet Corriganism Join Date: Jan. 22nd, 2002 Location: What state you ask? Denial. Posts: 85	Silly Flak Grenade Physics I was messing around with a flak-grenade type weapon and I was trying to figure out how to make it arc correctly, but I seem to be having trouble. The flak grenade uses Physics="PHYS_Falling" in default properties to make it arc the way it does, but this arc is too extreme. Is there a way of making it arc only slightly over a long distance? I'm a newbie coder, so I am not really sure what I can and can't do. BTW- What exactly does the CalcDrawOffset function do. The name suggests that it might have to do with the discrepancy between "internal" viewpoint (the player view) and an "external" viewpoint. I can't be sure though. __________________ A Haiku The people who say Never say never, always Forget their own rule. Share the knowledge: Unreal Wiki

26th Jan 2002, 09:11 AM	#2
Wormbo Join Date: Jun. 4th, 2001 Location: Germany Posts: 5,484	Try this in the flak shell's Tick() function: Code: Velocity -= 0.3 * Region.Zone.ZoneGravity; Adjust the 0.3 to fit your needs. CalcDrawOffset() returns a vector for drawing the weapon in 1st person view (see Weapon.RenderOverlays() for details) __________________ Wormbo's UT/UT2004/UT3 mods \| PlanetJailbreak \| Unreal Wiki \| Liandri Archives Everything you ever wanted to know about replication (but were afraid to ask) [in German] \| UnrealScript security considerations <elmuerte> you shouldn't do all-nighters, it's a waste of time and effort <TNSe> nono <TNSe> its always funny to find code a week later you dont even remember writing <Pfhoenix> what's worse is when you have a Star Wars moment <Pfhoenix> "Luke! I am your code!" "No! Impossible! It can't be!"

29th Jan 2002, 02:00 PM	#3
EasyRaider Crazy coder Join Date: Sep. 21st, 2001 Location: Norway Posts: 74	That code would be frame rate dependant. A Timer() might be better. (edit) Or something like: Code: Acceleration = 0.5 * Region.Zone.ZoneGravity(); __________________ Aim for the horizon but watch your step Last edited by EasyRaider; 29th Jan 2002 at 02:17 PM.

30th Jan 2002, 04:34 PM	#5
WheatPuppet Corriganism Join Date: Jan. 22nd, 2002 Location: What state you ask? Denial. Posts: 85	Umm, thanks. How is it that you figure out all these esoteric class references? __________________ A Haiku The people who say Never say never, always Forget their own rule. Share the knowledge: Unreal Wiki

31st Jan 2002, 05:11 AM	#6
Wormbo Join Date: Jun. 4th, 2001 Location: Germany Posts: 5,484	What class references? Region.Zone.ZoneGravity? __________________ Wormbo's UT/UT2004/UT3 mods \| PlanetJailbreak \| Unreal Wiki \| Liandri Archives Everything you ever wanted to know about replication (but were afraid to ask) [in German] \| UnrealScript security considerations <elmuerte> you shouldn't do all-nighters, it's a waste of time and effort <TNSe> nono <TNSe> its always funny to find code a week later you dont even remember writing <Pfhoenix> what's worse is when you have a Star Wars moment <Pfhoenix> "Luke! I am your code!" "No! Impossible! It can't be!"

31st Jan 2002, 08:41 AM	#8
Kangus Zombie on your pwn! Join Date: Jan. 29th, 2001 Location: Illinois, USA Posts: 978	simple answer.... I shoulda said this ages ago. Reduce the grenade's mass in its default properties, this should make its arc longer. The default mass for most things seems to be 100.... __________________ --Kangus

31st Jan 2002, 10:25 AM	#9
EasyRaider Crazy coder Join Date: Sep. 21st, 2001 Location: Norway Posts: 74	You mean the native physics code makes less massive objects fall slower? I refuse to believe the physics are that bad coded... __________________ Aim for the horizon but watch your step

1st Feb 2002, 09:00 AM	#10
WheatPuppet Corriganism Join Date: Jan. 22nd, 2002 Location: What state you ask? Denial. Posts: 85	That would be awfully daft! Remember... 9.8 m/s^2.... 9.8 m/s^2 __________________ A Haiku The people who say Never say never, always Forget their own rule. Share the knowledge: Unreal Wiki

4th Feb 2002, 03:41 PM	#11
EvilDrWong Every line of code elevates you Join Date: Jun. 16th, 2001 Location: Inside the machine Posts: 932	heres an idea... why not just shoot the projectile a bit faster? it wont fall as short as it is now... or hows about giving it a bit of a boost on its Z axis velocity when its spawned? that should make it arc a bit further. __________________ How can you challenge a perfect immortal machine?

4th Feb 2002, 05:04 PM	#12
WheatPuppet Corriganism Join Date: Jan. 22nd, 2002 Location: What state you ask? Denial. Posts: 85	The problem with that is that I dont want to fire it faster. The flak shell moves horizontally at about the right rate, just it doesn't move vertically at the right rate. Trust me, I got the x/y movement about right. __________________ A Haiku The people who say Never say never, always Forget their own rule. Share the knowledge: Unreal Wiki

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