优化弹道计算方法
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Atsuishio
Light_Quanta
parent
f8d5549bbf
commit
20ba4312d8
3 changed files with 118 additions and 120 deletions
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@ -258,8 +258,7 @@ public class MediumRocketEntity extends FastThrowableProjectile implements GeoEn
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if (type == Type.CM && getDeltaMovement().y < 0.1 && !active) {
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if (position().y < level().getMinBuildHeight() || position().y > level().getMaxBuildHeight()) return;
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BlockPos hitBlock = ProjectileCalculator.calculateImpactPosition(level(), position(), getDeltaMovement(), -0.05);
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Vec3 finalPos = hitBlock.getCenter();
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Vec3 finalPos = ProjectileCalculator.calculatePreciseImpactPoint(level(), position(), getDeltaMovement(), -0.05);
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double vh = getDeltaMovement().horizontalDistance();
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double dh = position().vectorTo(finalPos).horizontalDistance();
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int t = (int) (dh / vh);
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@ -288,7 +288,7 @@ public class A10Entity extends ContainerMobileVehicleEntity implements GeoEntity
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// 计算航弹落点
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if (level().isClientSide) {
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bombLandingPos = ProjectileCalculator.calculateImpactPosition(level(), shootPos(1), shootVec(1), -0.06).getCenter();
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bombLandingPos = ProjectileCalculator.calculatePreciseImpactPoint(level(), shootPos(1), shootVec(1), -0.06);
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}
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this.refreshDimensions();
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@ -1,146 +1,145 @@
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package com.atsuishio.superbwarfare.tools;
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import net.minecraft.core.BlockPos;
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import net.minecraft.core.particles.ParticleTypes;
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import net.minecraft.world.level.ClipContext;
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import net.minecraft.world.level.Level;
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import net.minecraft.world.level.block.state.BlockState;
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import net.minecraft.world.phys.BlockHitResult;
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import net.minecraft.world.phys.HitResult;
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import net.minecraft.world.phys.Vec3;
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import java.util.Optional;
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public class ProjectileCalculator {
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private static final double TIME_STEP = 0.1; // 时间步长（刻）
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private static final int MAX_ITERATIONS = 1000; // 最大迭代次数
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private static final double TIME_STEP = 0.05; // 时间步长（刻）
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private static final int MAX_ITERATIONS = 2000; // 最大迭代次数
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private static final double COLLISION_THRESHOLD = 0.001; // 碰撞检测阈值
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/**
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* 计算炮弹落地位置
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* 计算炮弹精确落点位置（Vec3）
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*
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* @param world 世界对象
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* @param startPos 发射点位置
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* @param launchVector 发射向量
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* @return 预测的落点方块位置
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* @param level 世界对象
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* @param startPos 发射点位置（Vec3）
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* @param launchVector 发射向量（Vec3）
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* @return 精确的落点位置（Vec3），如果没有碰撞则返回最后位置
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*/
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public static BlockPos calculateImpactPosition(Level world, Vec3 startPos, Vec3 launchVector, double gravity) {
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// 当前炮弹位置和速度
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public static Vec3 calculatePreciseImpactPoint(Level level, Vec3 startPos, Vec3 launchVector, double gravity) {
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Vec3 currentPos = startPos;
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Vec3 currentVelocity = launchVector;
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// 记录上一刻位置
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Vec3 prevPos = startPos;
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Vec3 previousPos = startPos;
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for (int i = 0; i < MAX_ITERATIONS; i++) {
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// 更新位置
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// 计算下一个位置
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Vec3 nextPos = currentPos.add(
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currentVelocity.x * TIME_STEP,
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currentVelocity.y * TIME_STEP,
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currentVelocity.z * TIME_STEP
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);
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// 更新速度（重力影响）
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// 应用重力
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currentVelocity = currentVelocity.add(0, gravity * TIME_STEP, 0);
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// 检查是否碰撞方块
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BlockPos collisionPos = checkCollision(world, prevPos, nextPos);
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if (collisionPos != null) {
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return collisionPos;
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// 检查碰撞
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Optional<Vec3> collisionPoint = checkCollision(level, previousPos, nextPos);
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if (collisionPoint.isPresent()) {
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// 精确计算碰撞点
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return refineCollisionPoint(level, previousPos, collisionPoint.get());
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}
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// 更新位置进行下一步
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prevPos = currentPos;
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// 边界检查
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if (nextPos.y < level.getMinBuildHeight()) {
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return new Vec3(nextPos.x, level.getMinBuildHeight(), nextPos.z);
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}
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// 更新位置
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previousPos = currentPos;
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currentPos = nextPos;
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}
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// 超过最大迭代次数，返回最后位置
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return currentPos;
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}
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/**
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* 检查两点之间是否有碰撞
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*/
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private static Optional<Vec3> checkCollision(Level level, Vec3 start, Vec3 end) {
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// 使用Minecraft内置的光线追踪进行碰撞检测
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BlockHitResult hitResult = level.clip(new ClipContext(
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start,
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end,
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ClipContext.Block.COLLIDER, // 只检测碰撞方块
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ClipContext.Fluid.NONE, // 忽略流体
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null // 无实体
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));
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// 如果检测到碰撞，返回碰撞点
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if (hitResult.getType() == HitResult.Type.BLOCK) {
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return Optional.of(hitResult.getLocation());
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}
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// 没有检测到碰撞
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return Optional.empty();
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}
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/**
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* 精确计算碰撞点（使用二分法提高精度）
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*/
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private static Vec3 refineCollisionPoint(Level level, Vec3 safePoint, Vec3 collisionPoint) {
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Vec3 low = safePoint;
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Vec3 high = collisionPoint;
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Vec3 bestPoint = collisionPoint;
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// 二分法迭代提高精度
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for (int i = 0; i < 10; i++) {
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Vec3 mid = low.add(high.subtract(low).scale(0.5));
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// 检查从安全点到中点是否有碰撞
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Optional<Vec3> collision = checkCollision(level, low, mid);
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if (collision.isPresent()) {
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// 有碰撞，将高点移动到中点
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high = mid;
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bestPoint = collision.get();
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} else {
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// 无碰撞，将低点移动到中点
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low = mid;
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}
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}
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return bestPoint;
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}
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/**
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* 可视化炮弹轨迹（用于调试）
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*/
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public static void visualizeTrajectory(Level level, Vec3 startPos, Vec3 launchVector, double gravity) {
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if (!level.isClientSide()) return;
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Vec3 currentPos = startPos;
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Vec3 currentVelocity = launchVector;
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for (int i = 0; i < 100; i++) {
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Vec3 nextPos = currentPos.add(
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currentVelocity.x * 0.5,
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currentVelocity.y * 0.5,
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currentVelocity.z * 0.5
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);
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// 创建粒子效果显示轨迹
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for (double d = 0; d < 1.0; d += 0.1) {
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Vec3 point = currentPos.add(nextPos.subtract(currentPos).scale(d));
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level.addParticle(ParticleTypes.ELECTRIC_SPARK,
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point.x, point.y, point.z,
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0, 0, 0);
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}
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// 应用重力
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currentVelocity = currentVelocity.add(0, gravity * 0.5, 0);
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currentPos = nextPos;
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// 安全检查：防止飞出世界边界
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if (currentPos.y < world.getMinBuildHeight() || currentPos.y > world.getMaxBuildHeight()) {
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return new BlockPos(
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(int)Math.floor(currentPos.x),
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(int)Math.floor(currentPos.y),
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(int)Math.floor(currentPos.z)
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);
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}
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// 提前终止检查
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if (currentPos.y < level.getMinBuildHeight()) break;
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}
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// 超过最大迭代次数，返回当前位置
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return new BlockPos(
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(int)Math.floor(currentPos.x),
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(int)Math.floor(currentPos.y),
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(int)Math.floor(currentPos.z)
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);
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}
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/**
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* 检查两点之间是否有碰撞方块
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*/
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private static BlockPos checkCollision(Level world, Vec3 start, Vec3 end) {
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// 使用距离和方向向量
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double dx = end.x - start.x;
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double dy = end.y - start.y;
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double dz = end.z - start.z;
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double distance = Math.sqrt(dx*dx + dy*dy + dz*dz);
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if (distance == 0) return null;
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// 方向单位向量
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double dirX = dx / distance;
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double dirY = dy / distance;
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double dirZ = dz / distance;
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// 步进检查
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double stepSize = 0.1; // 检查步长
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for (double t = 0; t < distance; t += stepSize) {
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double x = start.x + dirX * t;
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double y = start.y + dirY * t;
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double z = start.z + dirZ * t;
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BlockPos pos = new BlockPos((int)Math.floor(x), (int)Math.floor(y), (int)Math.floor(z));
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BlockState state = world.getBlockState(pos);
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// 检查是否碰到固体方块
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if (!state.isAir()) {
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return pos;
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}
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// 检查是否碰到下方方块（炮弹落地）
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BlockPos belowPos = pos.below();
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BlockState belowState = world.getBlockState(belowPos);
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if (y - Math.floor(y) < 0.1 && !belowState.isAir()) {
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return belowPos;
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}
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}
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return null;
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}
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/**
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* 快速预测落点（不考虑地形，仅数学计算）
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* 用于平坦地形或初始估算
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*/
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public static Vec3 estimateLandingPosition(Vec3 startPos, Vec3 launchVector, double gravity) {
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double vx = launchVector.x;
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double vy = launchVector.y;
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double vz = launchVector.z;
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// 计算飞行时间 (解二次方程: y = y0 + vy*t + 0.5*g*t² = 0)
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double a = 0.5 * gravity;
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double b = vy;
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double c = startPos.y; // 假设地面高度为0
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// 计算判别式
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double discriminant = b*b - 4*a*c;
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if (discriminant < 0) {
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// 无实数解，炮弹不会落地
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return null;
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}
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// 取正数解
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double t = (-b + Math.sqrt(discriminant)) / (2*a);
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if (t < 0) {
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t = (-b - Math.sqrt(discriminant)) / (2*a);
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}
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// 计算落点
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double x = startPos.x + vx * t;
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double z = startPos.z + vz * t;
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return new Vec3(x, 0, z);
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}
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}
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