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Implement exposure calculation for explosions (#6826)

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Co-authored-by: Dylan T. <dktapps@pmmp.io>
This commit is contained in:
Wraith
2025-10-06 17:05:52 +01:00
committed by GitHub
parent 76dbe83b03
commit 3ce1b2fdb1
1 changed files with 52 additions and 1 deletions
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53
src/world/Explosion.php
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@@ -38,6 +38,7 @@ use pocketmine\item\VanillaItems;
use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
use pocketmine\math\Vector3;
use pocketmine\math\VoxelRayTrace;
use pocketmine\utils\AssumptionFailedError;
use pocketmine\utils\Utils;
use pocketmine\world\format\SubChunk;
@@ -218,8 +219,9 @@ class Explosion{
if($distance <= 1){
$motion = $entityPos->subtractVector($this->source)->normalize();
$exposure = $this->getExposure($this->source, $entity);
$impact = (1 - $distance) * ($exposure = 1);
$impact = (1 - $distance) * $exposure;
$damage = (int) ((($impact * $impact + $impact) / 2) * 8 * $explosionSize + 1);
@@ -269,6 +271,51 @@ class Explosion{
return true;
}
/**
* Returns the explosion exposure of an entity, used to calculate explosion impact.
*/
private function getExposure(Vector3 $origin, Entity $entity) : float{
$bb = $entity->getBoundingBox();
$diff = (new Vector3($bb->getXLength(), $bb->getYLength(), $bb->getZLength()))->multiply(2)->add(1, 1, 1);
$step = new Vector3(1.0 / $diff->x, 1.0 / $diff->y, 1.0 / $diff->z);
$xOffset = (1.0 - (floor($diff->x) / $diff->x)) / 2.0;
$zOffset = (1.0 - (floor($diff->z) / $diff->z)) / 2.0;
$checks = 0.0;
$hits = 0.0;
for($x = 0.0; $x <= 1.0; $x += $step->x){
for($y = 0.0; $y <= 1.0; $y += $step->y){
for($z = 0.0; $z <= 1.0; $z += $step->z){
$point = new Vector3(
self::lerp($x, $bb->minX, $bb->maxX) + $xOffset,
self::lerp($y, $bb->minY, $bb->maxY),
self::lerp($z, $bb->minZ, $bb->maxZ) + $zOffset
);
$intercepted = false;
foreach(VoxelRayTrace::betweenPoints($origin, $point) as $pos){
$block = $this->world->getBlock($pos);
if($block->calculateIntercept($origin, $point) !== null){
$intercepted = true;
break;
}
}
if(!$intercepted){
$hits++;
}
$checks++;
}
}
}
return $checks > 0.0 ? $hits / $checks : 0.0;
}
/**
* Sets a chance between 0 and 1 of creating a fire.
* For example, if the chance is 1/3, then that amount of affected blocks will be ignited.
@@ -282,4 +329,8 @@ class Explosion{
}
$this->fireChance = $fireChance;
}
private static function lerp(float $scale, float $a, float $b) : float{
return $a + $scale * ($b - $a);
}
}