Bullet tracer and smoke trail effect

smith · January 10, 2021, 6:43pm

I am presently looking to switch away from picking/hit scanning to modeled bullet objects and want to include random tracers and smoke trails is there an example or library that can help achieve this effect, I am going to be using physics driven bullets.

thanks

oxplay2 · January 10, 2021, 10:15pm

idk if there is demo, but, you should try Minie physics as its more stable.

about idea, IMO it depends a lot if “bullet” will move really quick, or will be slower “like a rocket”.

For a quick one i would not even use particles, but just single bilboard image of smoke attatched to bullet node and be rotated in move direction way.
If its slower bullet(rocket/etc), then you could use particle system to simulate smoke trail.
(well for smoke trails you can use Any particle libraries, even core one.)

smith · January 11, 2021, 12:06am

I already use minie and know how to move the bullet with physics, an example of the the trails tracer bullet or a good approach to it is what I’m after, there are going the a lot of trails so I imagine performance will be a consideration as well

the billboard approach how would that work best, given multiple shooting characters?

again if you can point me in the direction of an example that would be helpful…not here much so I miss plenty

Ali_RS · January 11, 2021, 6:25am

Found these from bookmark. Maybe you find them useful.

1-
https://store.jmonkeyengine.org/189b56af-a1be-4036-8ac7-2b62a94935ff

2-

github.com

ATryder/SpaceRocks/blob/6353739e2f4f952fde3eeb7f64edb04228ebb26f/app/src/main/java/com/atr/spacerocks/effects/EngineTrail.java#L40


      
          import com.simsilica.lemur.GuiGlobals;
          import java.nio.ByteBuffer;
          import java.nio.FloatBuffer;
          import java.nio.ShortBuffer;
          
          /**
           *
           * @author Adam T. Ryder
           * <a href="http://1337atr.weebly.com">http://1337atr.weebly.com</a>
           */
          public class EngineTrail extends Geometry {
              private static final float POINT_LIFE = 1f;
              private static final float FPS = 1 / 25f;
              
              private final float engine1Local = -1.26233f;
              private final float engine2Local = 1.26233f;
              private final Vector3f midPoint = new Vector3f(0, -0.01642f, 4.26027f);
              private final Vector3f tmp = new Vector3f();
              
              private final TrailPoint[] trail = new TrailPoint[60];

3-

smith · January 11, 2021, 9:31am

thanks will check them out