Unity3D Tanks 2018-08-20: Better camera, better ballistics, better pizza!

[@ActionScripter]

This project is now called "Gunner, HEAT, PC!" and will be developed into a full game with your support! Check out the public demo page here: [removed] Edit: The game was released on Steam in early access in September 2022 and the prototype demo is no longer available. You can find the store page and more info at gunnerheatpc.com

[@JaridMitchell]

Holy shit, finding out this is what turned into gunner heat is crazyyyy!!! Super inspiring

[@TheBeastFeastLP]

Oh hell yeah, been waiting for an update vid on this, looking great!

[@JockeyStrappers]

Looks pretty damn nice! Any updates to how you calculate composite strength/arrangment and how it affects the penatration and spall?

[@ActionScripter]

Yep! I now have all the composite armor modeled separately for fine-tuning against different penetrator types. Also, the spall is dependent on several factors: penetrator type, armor thickness, and spall liner. In general, it should be pretty close to realistic now - and where it falls short, I can fix it quickly. I even have subtle differences accounted for, like different ricochet angles for different ammo types, or both impact and time fuses for HE rounds, or the normalization of spall from kinetic long rods.

[@coryskelly1839]

Hey man its looking great!

[@ActionScripter]

Thanks Cory!

[@leavemealone3364]

respect

[@radue9658]

I'm interested on how u manage to calculate the angle between the shell and the armour peace you hit, could you give me a hint? ty

[@ActionScripter]

You can get the normal of the surface struck from a RaycastHit. From there, it's just vector angles between the incident ray and the normal.

[@radue9658]

@@ActionScripter oh ty very much, appreciate

[@ekmekaraskodlama384]

very nice i hope i can get to do sth like that. i downloaded the game

[@BlitzFromBehind]

Don't mean to diss since I know you're a small team and use free models but that BMD-3 model is so funky 👌

[@ActionScripter]

It sure is. Luckily, the next public build will only feature models made specifically for GHPC. Check out some of the recent images at GunnerHEATPC.com to see how far we've come!

[@BlitzFromBehind]

@@ActionScripter will do o7 been drooling all over this since I first found out about it.

[@Prometheus19853]

Will the ballistic and damage model also take in to account pyrophoric materials? Also, how are you modeling HEAT?

[@ActionScripter]

I do plan on implementing a fire/injury modifier for pyrophoric penetrators at a later time. The crew health and fire starting are both all-or-nothing at the moment, but once they're made more detailed, there will be a reason to model pyrophoric effects. Currently, HEAT is modeled as a central jet with high penetration that burns itself out after a finite distance, surrounded by a spall pattern that is stronger toward the center and weaker toward the edges. Many of the HEAT shells also have some HE-style fragmentation when they detonate. The AAR view does not yet distinguish different kinds of frag/spall, so it looks pretty cluttered most of the time, but the underlying simulation is meant to be realistic. If you have any tips/info on HEAT post-pen damage, I'm always interested.

[@Prometheus19853]

@@ActionScripter Good stuff, very interested in how this pans out. As for HEAT, the jet basically acts like it would when hitting spaced armor. It immediately decollates in to a huge spray of high velocity copper (or whatever other material(s) used in the liner) microfragments that incidentally happen to be VERY hot. It has the effect of simultaneously turning the crew in to red soup and burning/shredding everything in the compartment. HEAT is not a fun way to die, or a merciful way to kill an enemy.

[@DigitalShaolin]

Hey wassup, is there any chance you could point me to any recourses that contain formulas or anything like that to determine spall data like the amount of spall fragments and stuff like that. I've been looking for any solutions to this problem but haven't been able to come up with much yet, Thanks!

[@ActionScripter]

An interesting start for kinetic projectiles is "Model for ballistic fragmentation and behind-armor debris" by Yarin, Roisman, Weber, and Hohler. For HEAT rounds, you may be interested in "Shaped Charge Attack of Spaced and Composite Armour" by Horsfall, Petrou, and Champion. If you search for keywords like "armor penetration", "projectile", "shaped charge", "cumulative", and "after-armor effect" on academic research sites, you'll find a trove of information out there. Best of luck!

[@DigitalShaolin]

@@ActionScripter holy crap! Appreciate the response and info man. This comment was just a shot in the dark and this was the last thing I thought I would see today but it’s a very welcome surprise after putting the project on the back burner. Appreciate it man and good luck with GHPC!

[@razeqer5776]

How did you get so smooth camera movement ?

[@ActionScripter]

I wrote a custom camera controller that moves the camera smoothly toward a target position based on viewing angle and position. It has two properties that make it smooth: (1) a scaled displacement routine that's essentially a Lerp, and (2) a mouse input "accumulator" that averages out sharp inputs and makes the result cleaner.

[@B.E.A.R-FR]

how to download this game pls ?

[@ActionScripter]

The demo is available as "Gunner, HEAT, PC!" on itch.io and there's a Discord server for testers linked in the main menu screen.

[@leo523]

@@ActionScripter please release Linux version

[@msorin74]

When tutorial to make all this?

[@ActionScripter]

Great joke

[@msorin74]

i have no idea how to use unity and all id need is some simple tank controls but ok

[@BitorBit_]

Code/formula for spallin?

[@ActionScripter]

There's nothing special about the code. The projectiles are pooled raycast-based entities with a quadratic drag flight model, and the actual formulas for the amount, angle, and energy of fragmentation are custom made based on reading a lot of research papers and test reports. Assuming you're asking because you're interested in making something similar, you should create your own system, based on whatever projectile and armor representations you use and what results you want. The code includes parameters for input from various systems present in this armor/ballistics model, such as armor hardness, LOS thickness, normal thickness, projectile penetration rating, remaining energy level, impact angle, special material properties, HEAT jet state, and distance from initial impact point. It's all built specifically to work with my systems and I'm not going to share it as a general solution. You can find armor penetration studies on your own and choose how to interpret them based on how much detail is appropriate for your own projects. The more you read, the better you'll be able to create a behavior that suits your purposes. Even just "eyeballing it" from what you learn will probably be enough for a facsimile of real results, or you could go the other way and try copying the actual formulas proposed in the papers. An interesting start for kinetic projectiles is "Model for ballistic fragmentation and behind-armor debris" by Yarin, Roisman, Weber, and Hohler. For HEAT rounds, you may be interested in "Shaped Charge Attack of Spaced and Composite Armour" by Horsfall, Petrou, and Champion. Of course, there's far more info out there than these two papers. Good luck.