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| help with spread of shrapnal in a cannon like weapon http://45.55.195.193/viewtopic.php?f=1&t=17455 |
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| Author: | snapperfisch [ Mon Dec 28, 2009 7:21 pm ] |
| Post subject: | help with spread of shrapnal in a cannon like weapon |
hi what i'm trying to do is make a "cannon ball" that explodes into a concentrated burst of particles (with a spread of a bout 15 degrees or less) forward in relation to the "cannon ball" i tried using s the spread variable of a MOSRotating by changing it to 0.1 but whenever it gibs the explosion is always going right, it looks like cc takes the spread as being in relation to the scene and not the round i would appreciate a solution, thanks heres th code of the MOSRotating Code: AddEffect = MOSRotating PresetName = Fraglet Mass = 0.1 OrientToVel = 1 RestThreshold = -500 HitsMOs = 1 GetsHitByMOs = 0 SpriteFile = ContentFile FilePath = Base.rte/Devices/Cannons/CannonRound.bmp ScriptPath = phalax.rte/airbirst.lua FrameCount = 1 SpriteOffset = Vector X = -2 Y = -2 EntryWound = AEmitter CopyOf = Dent Metal ExitWound = AEmitter CopyOf = Dent Metal AtomGroup = AtomGroup AutoGenerate = 1 Material = Material CopyOf = Military Stuff Resolution = 2 Depth = 0 DeepGroup = AtomGroup AutoGenerate = 1 Material = Material CopyOf = Military Stuff Resolution = 4 Depth = 1 DeepCheck = 1 GibImpulseLimit = 1 GibSound = Sound AddSample = ContentFile FilePath = Base.rte/Sounds/Explode2.wav // AddGib = Gib // GibParticle = MOPixel // CopyOf = Flash Particle Yellow Big // Count = 1 // Spread = 2.25 // MaxVelocity = 0.1 // MinVelocity = 0 // InheritsVel = 0 AddGib = Gib GibParticle = MOPixel CopyOf = Grenade Fragment Gray LifeTime = 100 Count = 10 Spread = 0.1 // MaxVelocity = 50 // MinVelocity = 75 InheritsVel = 1 AddGib = Gib GibParticle = MOPixel CopyOf = Grenade Fragment Yellow Count = 15 Spread = 0.1 // MaxVelocity = 50 // MinVelocity = 75 InheritsVel = 1 // AddGib = Gib // GibParticle = MOSParticle // CopyOf = Side Thruster Blast Ball 1 // Count = 10 // Spread = 2.25 // MaxVelocity = 20 // MinVelocity = 0 // InheritsVel = 0 // AddGib = Gib // GibParticle = MOPixel // CopyOf = Air Blast // Count = 15 // Spread = 2.25 // MaxVelocity = 30 // MinVelocity = 0 // InheritsVel = 0 the air burst lua should make it explode befor it hits the ground or wall or whatever and detonate it such that the shapnal goes into the target instead of being emitted away from it because of the round rebounding but i cant see if it works untill i sort this problem out. |
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| Author: | Abdul Alhazred [ Mon Dec 28, 2009 10:21 pm ] |
| Post subject: | Re: help with spread of shrapnal in a cannon like weapon |
One possible solution is using inherit velocity like the Base.rte flak cannon. For a more precise method create a separate shrapnel emitter and try adding something like this to your script: Code: function Create(self) self.lastRot = self.RotAngle -- don't bounce end function Destroy(self) local Blast = CreateAEmitter("HEAT Blast", "ModName.rte") Blast.Pos = self.Pos Blast.RotAngle = self.lastRot MovableMan:AddParticle(Blast) end function Update(self) self.lastRot = self.RotAngle end |
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| Author: | Azukki [ Tue Dec 29, 2009 3:58 am ] |
| Post subject: | Re: help with spread of shrapnal in a cannon like weapon |
With significantly arced trajectories, that script might be a little weird. You might want to update lastRot every 100 ms or something like that instead. Just a suggestion, make the explosion partially radial too. Sure, shaped charges, directed blast, etc, but it will look better and more believable if there's some explosion going backward, even if the main focus of the effect is directed. This can be added to the blast emitter just by making emissions with more spread and less velocity. |
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| Author: | snapperfisch [ Thu Dec 31, 2009 12:52 pm ] |
| Post subject: | Re: help with spread of shrapnal in a cannon like weapon |
so why is spread tied to the scene instead of the round that the particles come from then? |
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| Author: | Shook [ Thu Dec 31, 2009 2:24 pm ] |
| Post subject: | Re: help with spread of shrapnal in a cannon like weapon |
What you should do is to make the shrapnel inherit the projectiles velocity, have them gib in a spread of 3.14, and then give them a somewhat low maximum velocity, like 10-20 or so, depending on the speed of your projectile, like so: Code: AddGib = Gib GibParticle = MOPixel CopyOf = Grenade Fragment Gray LifeTime = 100 Count = 10 Spread = 3.14 MaxVelocity = 15 MinVelocity = 0 InheritsVel = 1 Give it a shot. To make the spread wider/narrower, increase/decrease MaxVelocity. This is because of the fact that an object, that detonates in the air, doesn't have its gibs inherit the objects angle, but rather is fixed at 0, meaning horizontally to the right. This is solely due to the game engine, so there's not much we can do about that one problem. There are numerous workarounds, however. |
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| Author: | Azukki [ Mon Jan 04, 2010 3:50 am ] |
| Post subject: | Re: help with spread of shrapnal in a cannon like weapon |
But then, if the initial projectile hits something, the velocity inherited is after the collision. The problem with that is made obvious when some vanilla explosives are used on the side of a rocket. The explosion bounces off. This can be counteracted with tweaked projectile material properties, but not entirely undone. If it's a cluster bomb or something like that, gibs are probably the way to go, but if you want a directional explosion like a shaped charge, using an emitter as described will give more consistent results. |
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