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This is incorrect, because bullet shadow has nothing to do with whether bullets collide or not — it’s all about information. You know perfectly you won’t get hit in the shadow, so danger is 0. You still get hit by the part outside of shadow in the incoming wave though.

Let's say we have wave1(distanceTraveled 300) and wave2(distanceTraveled 100).

I shoot a bullet and it is calculated that it will intersect with wave2 at the x point so I set the danger to 0.

The bullet collides with the bullet that is on wave1 and the spot on wave2 isn't safe anymore.

Okay, I think I get it. Would the formula be

 PositionDanger = bulletPassedWave == true ? 0 : normalDanger

And if you are surfing multiple waves, you can estimate the chance that the wave2 will have a shadow by calculating in the percent chance the bullet will collide and add that to your calculations. Of course, once wave1 breaks, you can know for sure whether the position is 100% safe or not.

Yes, bullet shadows can be deleted, when the bullet casting shadow is destroyed before intersection happens.

However, I don’t think modeling this helps anything, since 1. we are already recalculating shadows when collision happens 2. the chance of actual collision is always low for normal battles. 3. You don’t know that chance exactly, an estimation may decrease performance actually.

To accurately model the chance of bullet getting destroyed before intersection happens, you should consider more than a flat probability — since once a bullet passes all other waves except target wave, the only chance bullet collision happening is with the target wave.

I don’t think this added complexity should outperform traditional way that updates shadows when collisions actually happen.