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SPEAK YOUR MIND
"Does the distance one travels from center make one more free
to move?"
"No. Freedom has two parts: potential and resolution; as
metaphor has two parts: form and interpretation. Of course,
the two are intertwined. Metaphor lines the road to freedom,
as symbols and words are the bricks and mortar of meaning.
Freedom is being the bricoleur, the mason."
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Marathon: Resurrection Forum
Re: Critique: weapons
Posted By: Captain Bob
Date: 2007.9.26.20.25
In Response To: Re: Critique: weapons (Tycho)
I'm glad you like the feedback; it encourages me to offer my two cents more often.
Regarding the grenades, I think it should be possible to calculate their behavior in Marathon. I made a new physics model in Anvil, and the grenade speed was set to 256. Judging from Mark Levin's physics model reference (he worked on the recent Marathon: Durandal if I recall), units of projectile speed in Anvil are likely in internal units per engine tick. There are 1024 internal units per world unit, a world unit is 2 meters, and there are 30 ticks per second. So the horizontal speed of a grenade in Marathon is 15 meters per second.
The vertical acceleration is harder to pinpoint. Overall gravity in Marathon is low (possibly to make the absence of fall damage less noticeable), so 9.8 m/s/s would likely be too high. I recall that projectiles start at a height of 0.6 WU above the ground, and I confirmed this experimentally in M1A1. I timed the time it takes for a grenade to hit the ground on a level plane. Using a stopwatch and averaging for a clip of 7 grenades, I come up with 1.02 seconds. I confirmed that by playing a replay in slow motion, where I counted off approximately 31 ticks from launching a grenade to the grenade hitting the ground, which is 1.03 seconds. In contrast, it takes half that time for a grenade to hit the ground in M:R, using the center view key.
Doing a quadratic regression on these datapoints, I get an acceleration of -1.15 m/s/s. Startlingly low, really, but that's what it is in Marathon. If the time in the air is actually exactly 1 second, then the acceleration becomes exactly -1.2 m/s/s.
So, long story short, I believe grenades will behave correctly if they're given a 'muzzle velocity' of 15 m/s, and the effect of gravity on them is 1.15 m/s/s. I don't know how projectiles are defined in UT, but assuming things are already standardized to World Units, it should be implementable.
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