Add a ground_pound particle and rework the ground pound ability to only trigger when you actually reach the ground

src/main/java/com/minelittlepony/unicopia/ability/EarthPonyStompAbility.java

@@ -6,25 +6,18 @@ import com.minelittlepony.unicopia.BlockDestructionManager;
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.data.Hit;
 import com.minelittlepony.unicopia.entity.player.Pony;
+import com.minelittlepony.unicopia.particle.ParticleUtils;
+import com.minelittlepony.unicopia.particle.UParticles;
 import com.minelittlepony.unicopia.util.MagicalDamageSource;
+import com.minelittlepony.unicopia.util.PosHelper;
 import com.minelittlepony.unicopia.util.WorldEvent;
-import com.minelittlepony.unicopia.util.shape.Shape;
-import com.minelittlepony.unicopia.util.shape.Sphere;
-
-import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
-import net.minecraft.block.Blocks;
-import net.minecraft.block.ShapeContext;
 import net.minecraft.entity.attribute.EntityAttributes;
 import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.particle.BlockStateParticleEffect;
-import net.minecraft.particle.ParticleTypes;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Box;
-import net.minecraft.util.math.Direction;
 import net.minecraft.util.math.MathHelper;
-import net.minecraft.util.math.Vec3d;
 import net.minecraft.world.World;
 
 /**
@@ -80,12 +73,15 @@ public class EarthPonyStompAbility implements Ability<Hit> {
         PlayerEntity player = iplayer.getMaster();
 
         BlockPos ppos = player.getBlockPos();
-        BlockPos pos = getSolidBlockBelow(ppos, player.getEntityWorld());
+        BlockPos pos = PosHelper.findSolidGroundAt(player.getEntityWorld(), ppos);
 
         player.addVelocity(0, -(ppos.getSquaredDistance(pos)), 0);
 
+        iplayer.waitForFall(() -> {
+            BlockPos center = PosHelper.findSolidGroundAt(player.getEntityWorld(), player.getBlockPos());
+
             iplayer.getWorld().getOtherEntities(player, areaOfEffect.offset(iplayer.getOriginVector())).forEach(i -> {
-            double dist = Math.sqrt(pos.getSquaredDistance(i.getBlockPos()));
+                double dist = Math.sqrt(center.getSquaredDistance(i.getBlockPos()));
 
                 if (dist <= rad + 3) {
                     double force = dist / 5;
@@ -113,7 +109,7 @@ public class EarthPonyStompAbility implements Ability<Hit> {
                 }
             });
 
-        BlockPos.iterate(pos.add(-rad, -rad, -rad), pos.add(rad, rad, rad)).forEach(i -> {
+            BlockPos.iterate(center.add(-rad, -rad, -rad), center.add(rad, rad, rad)).forEach(i -> {
                 double dist = Math.sqrt(i.getSquaredDistance(player.getX(), player.getY(), player.getZ(), true));
 
                 if (dist <= rad) {
@@ -121,11 +117,10 @@ public class EarthPonyStompAbility implements Ability<Hit> {
                 }
             });
 
-        for (int i = 1; i < 202; i+= 2) {
+            ParticleUtils.spawnParticle(player.world, UParticles.GROUND_POUND, player.getX(), player.getY() - 1, player.getZ(), 0, 0, 0);
-            spawnParticleRing(player, i, 0);
-        }
 
             iplayer.subtractEnergyCost(rad);
+        });
     }
 
     private void spawnEffect(World w, BlockPos pos, double dist) {
@@ -155,43 +150,5 @@ public class EarthPonyStompAbility implements Ability<Hit> {
 
     @Override
     public void postApply(Pony player, AbilitySlot slot) {
-        int timeDiff = getCooldownTime(player) - player.getAbilities().getStat(slot).getRemainingCooldown();
-
-        if (player.getMaster().getEntityWorld().getTime() % 1 == 0 || timeDiff == 0) {
-            spawnParticleRing(player.getMaster(), timeDiff, 1);
-        }
-    }
-
-    private void spawnParticleRing(PlayerEntity player, int timeDiff, double yVel) {
-        int animationTicks = timeDiff / 7;
-        if (animationTicks < 6) {
-            Shape shape = new Sphere(true, animationTicks, 1, 0, 1);
-
-            double y = 0.5 + (Math.sin(animationTicks) * 1.5);
-
-            yVel *= y * 5;
-
-            for (int i = 0; i < shape.getVolumeOfSpawnableSpace(); i++) {
-                Vec3d point = shape.computePoint(player.getEntityWorld().random).add(player.getPos());
-                player.world.addParticle(new BlockStateParticleEffect(ParticleTypes.BLOCK, Blocks.DIRT.getDefaultState()),
-                        point.x,
-                        point.y,
-                        point.z,
-                        0, yVel, 0
-                );
-            }
-        }
-    }
-
-    private static BlockPos getSolidBlockBelow(BlockPos pos, World w) {
-        while (!World.isOutOfBuildLimitVertically(pos)) {
-            pos = pos.down();
-
-            if (Block.isFaceFullSquare(w.getBlockState(pos).getCollisionShape(w, pos, ShapeContext.absent()), Direction.UP)) {
-                return pos;
-            }
-        }
-
-        return pos;
     }
 }

src/main/java/com/minelittlepony/unicopia/client/URenderers.java

@@ -3,6 +3,7 @@ package com.minelittlepony.unicopia.client;
 import com.minelittlepony.unicopia.UEntities;
 import com.minelittlepony.unicopia.client.particle.ChangelingMagicParticle;
 import com.minelittlepony.unicopia.client.particle.DiskParticle;
+import com.minelittlepony.unicopia.client.particle.GroundPoundParticle;
 import com.minelittlepony.unicopia.client.particle.HealthDrainParticle;
 import com.minelittlepony.unicopia.client.particle.MagicParticle;
 import com.minelittlepony.unicopia.client.particle.RainboomParticle;
@@ -33,6 +34,7 @@ public interface URenderers {
         ParticleFactoryRegistry.getInstance().register(UParticles.RAINBOOM_TRAIL, RainbowTrailParticle::new);
         ParticleFactoryRegistry.getInstance().register(UParticles.SPHERE, SphereParticle::new);
         ParticleFactoryRegistry.getInstance().register(UParticles.DISK, DiskParticle::new);
+        ParticleFactoryRegistry.getInstance().register(UParticles.GROUND_POUND, GroundPoundParticle::new);
 
         EntityRendererRegistry.INSTANCE.register(UEntities.THROWN_ITEM, (manager, context) -> new FlyingItemEntityRenderer<>(manager, context.getItemRenderer()));
 

src/main/java/com/minelittlepony/unicopia/client/particle/GroundPoundParticle.java

@@ -0,0 +1,74 @@
+package com.minelittlepony.unicopia.client.particle;
+
+import com.minelittlepony.unicopia.util.shape.Shape;
+import com.minelittlepony.unicopia.util.shape.Sphere;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.client.particle.Particle;
+import net.minecraft.client.particle.ParticleTextureSheet;
+import net.minecraft.client.render.Camera;
+import net.minecraft.client.render.VertexConsumer;
+import net.minecraft.client.world.ClientWorld;
+import net.minecraft.particle.BlockStateParticleEffect;
+import net.minecraft.particle.DefaultParticleType;
+import net.minecraft.particle.ParticleTypes;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Vec3d;
+
+public class GroundPoundParticle extends Particle {
+
+    public GroundPoundParticle(DefaultParticleType effect, ClientWorld world, double x, double y, double z, double dX, double dY, double dZ) {
+        super(world, x, y, z, dX, dY, dZ);
+        maxAge = 10;
+    }
+
+    @Override
+    public ParticleTextureSheet getType() {
+        return ParticleTextureSheet.NO_RENDER;
+    }
+
+    @Override
+    public void buildGeometry(VertexConsumer vertexConsumer, Camera camera, float f) {
+    }
+
+    @Override
+    public void tick() {
+        super.tick();
+
+        spawnParticleRing(age, 1);
+    }
+
+
+    private void spawnParticleRing(int timeDiff, double yVel) {
+
+        Shape shape = new Sphere(true, timeDiff, 1, 0, 1);
+
+        double y = 0.5 + (Math.sin(timeDiff) * 2.5);
+
+        yVel *= y * 5;
+
+        Vec3d center = new Vec3d(x, this.y, z);
+        for (int i = 0; i < shape.getVolumeOfSpawnableSpace(); i++) {
+            Vec3d point = shape.computePoint(random).add(center);
+
+            BlockPos pos = new BlockPos(point.x, center.y - 1, point.z);
+
+            BlockState state = world.getBlockState(pos);
+            if (state.isAir()) {
+                state = world.getBlockState(pos.down());
+                if (state.isAir()) {
+                    state = Blocks.DIRT.getDefaultState();
+                }
+            }
+
+            world.addParticle(new BlockStateParticleEffect(ParticleTypes.BLOCK, state),
+                    point.x,
+                    point.y,
+                    point.z,
+                    0, yVel, 0
+            );
+        }
+    }
+
+}

src/main/java/com/minelittlepony/unicopia/entity/player/Pony.java

@@ -99,6 +99,9 @@ public class Pony implements Caster<PlayerEntity>, Equine<PlayerEntity>, Transmi
 
     private boolean invisible = false;
 
+    @Nullable
+    private Runnable landEvent;
+
     public Pony(PlayerEntity player) {
         this.entity = player;
         this.mana = new ManaContainer(this);
@@ -325,6 +328,10 @@ public class Pony implements Caster<PlayerEntity>, Equine<PlayerEntity>, Transmi
         }
     }
 
+    public void waitForFall(Runnable action) {
+        landEvent = action;
+    }
+
     public Optional<Float> onImpact(float distance, float damageMultiplier) {
 
         float g = gravity.getGravityModifier();
@@ -351,6 +358,10 @@ public class Pony implements Caster<PlayerEntity>, Equine<PlayerEntity>, Transmi
     }
 
     private void handleFall(float distance, float damageMultiplier) {
+        if (landEvent != null) {
+            landEvent.run();
+            landEvent = null;
+        }
         getSpellOrEmpty(DisguiseSpell.class, false).ifPresent(spell -> {
             spell.getDisguise().onImpact(this, distance, damageMultiplier);
         });

src/main/java/com/minelittlepony/unicopia/particle/UParticles.java

@@ -21,6 +21,8 @@ public interface UParticles {
 
     ParticleType<FollowingParticleEffect> HEALTH_DRAIN = register("health_drain", FabricParticleTypes.complex(true, FollowingParticleEffect.FACTORY));
 
+    DefaultParticleType GROUND_POUND = register("ground_pound", FabricParticleTypes.simple());
+
     static <T extends ParticleType<?>> T register(String name, T type) {
         return Registry.register(Registry.PARTICLE_TYPE, new Identifier("unicopia", name), type);
     }

src/main/resources/assets/unicopia/particles/ground_pound.json

@@ -0,0 +1,2 @@
+{
+}