Implement more realistic flying mechanics

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

@@ -1,50 +0,0 @@
-package com.minelittlepony.unicopia.entity.player;
-
-import com.minelittlepony.unicopia.util.MutableVector;
-
-import net.minecraft.entity.Entity;
-import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.util.math.Vec3d;
-
-public class AeronauticalPlayerPhysics extends PlayerPhysics {
-
-    private final Aeronautics auronautics = new Aeronautics();
-
-    private double gravity;
-
-    private int thrustCountdown;
-
-    public AeronauticalPlayerPhysics(Pony pony) {
-        super(pony);
-    }
-
-    @Override
-    public double calcGravity(double worldConstant) {
-        return gravity = super.calcGravity(worldConstant);
-    }
-
-    @Override
-    protected void moveFlying(Entity player, MutableVector velocity) {
-
-        PlayerEntity ply = (PlayerEntity)player;
-
-        auronautics.pitchAngle = 0;
-        auronautics.rollAngle = 0;
-
-        float yaw = player.getYaw(1);
-
-        Vec3d motion = auronautics.calcGravitationalAccelleration(gravity);
-
-        if (ply.forwardSpeed != 0 && thrustCountdown-- <= 0) {
-            thrustCountdown = 20;
-            player.playSound(getWingSound(), 0.4F, 1);
-            motion = motion.add(auronautics.calcThrustVelocity(-100));
-        }
-
-        motion = motion.rotateY(yaw).add(velocity.toImmutable()).multiply(1 - auronautics.getDrag());
-
-        velocity.x = motion.x;
-        velocity.y = motion.y;
-        velocity.z = motion.z;
-    }
-}

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

@@ -1,73 +0,0 @@
-package com.minelittlepony.unicopia.entity.player;
-
-import net.minecraft.util.math.Vec3d;
-
-// X - forward
-// Y - vertical
-// Z - sideways
-public class Aeronautics {
-
-    public double rollAngle;
-    public double pitchAngle;
-
-    /**
-     * Gets the normalized direction vector
-     */
-    private Vec3d getMomentVector() {
-        // sine(angle) = y/h
-        // cos(angle) = x/h
-
-        Vec3d climbVector = new Vec3d(Math.cos(pitchAngle), Math.sin(pitchAngle), 0);
-        Vec3d bankVector =  new Vec3d(0,                    Math.sin(rollAngle),  Math.cos(rollAngle));
-
-        return bankVector.add(climbVector).normalize();
-    }
-
-    /**
-     * Gets the normalized perpendicular vector.
-     */
-    private Vec3d getNormal() {
-        // sine(angle) = y/h
-        // cos(angle) = x/h
-
-        Vec3d climbVector = new Vec3d(Math.cos(pitchAngle), Math.sin(pitchAngle), 0);
-        Vec3d bankVector =  new Vec3d(0,                    Math.sin(rollAngle),  Math.cos(rollAngle));
-
-        return bankVector.crossProduct(climbVector).normalize();
-    }
-
-    /**
-     * Returns the acceleration vector due to gravity
-     * parallel to the slope of the incline described
-     * by the roll and pitch components.
-     *
-     * @param gravity The global gravitation constant C
-     */
-    public Vec3d calcGravitationalAccelleration(double gravity) {
-        return getMomentVector().multiply(
-               -gravity * Math.signum(pitchAngle),
-               -gravity,
-               -gravity * Math.signum(rollAngle)
-        );
-    }
-
-    /**
-     * Gets the added thrust vector for the given forwards motion
-     * and velocity projected against the direction of incline.
-     *
-     * @param forwards The forwards thrust speed
-     * @param velocity The current motion vector
-     */
-    public Vec3d calcThrustVelocity(double forwards) {
-        return getNormal().add(getMomentVector())
-                .normalize()
-                .multiply(forwards * (1 - getDrag()));
-    }
-
-    /**
-     * The drag due to air resistance.
-     */
-    public double getDrag() {
-        return 0.0078; // magic number until I figure out what tf I'm doing
-    }
-}

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

@@ -49,13 +49,9 @@ public final class PlayerDimensions {
             flyingDimensions = EntityDimensions.changing(dimensions.width, dimensions.height / 2);
         }
 
-        return getPredicate().flatMap(e -> e.getTargetDimensions(pony)).orElseGet(() -> {
+        return getPredicate()
-            if (physics.isFlyingSurvival && physics.isRainboom()) {
+                .flatMap(e -> e.getTargetDimensions(pony))
-                return flyingDimensions;
+                .orElseGet(() -> physics.isFlyingSurvival ? flyingDimensions : defaultDimensions);
-            }
-
-            return defaultDimensions;
-        });
     }
 
     private float calculateTargetEyeHeight() {
@@ -65,10 +61,6 @@ public final class PlayerDimensions {
             return height;
         }
 
-        if (physics.isFlyingSurvival && physics.isRainboom()) {
-            return 0.5F;
-        }
-
         return defaultEyeHeight;
     }
 

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

@@ -15,20 +15,21 @@ import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.sound.SoundCategory;
 import net.minecraft.sound.SoundEvent;
-import net.minecraft.sound.SoundEvents;
 import net.minecraft.util.Tickable;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.MathHelper;
+import net.minecraft.util.math.Vec3d;
 
 public class PlayerPhysics extends EntityPhysics<Pony> implements Tickable, Motion, NbtSerialisable {
 
     private int ticksInAir;
 
+    private float thrustScale = 0;
+
     public boolean isFlyingEither = false;
     public boolean isFlyingSurvival = false;
 
-    private double lastTickPosX = 0;
+    private Vec3d lastPos = Vec3d.ZERO;
-    private double lastTickPosZ = 0;
 
     private final PlayerDimensions dimensions;
 
@@ -47,30 +48,16 @@ public class PlayerPhysics extends EntityPhysics<Pony> implements Tickable, Moti
         return super.getGravityModifier() * (float)pony.getOwner().getAttributeValue(PlayerAttributes.ENTITY_GRAVTY_MODIFIER);
     }
 
-    private boolean checkCanFly() {
-        if (pony.getOwner().abilities.creativeMode || pony.getOwner().isSpectator()) {
-            return true;
-        }
-
-        if (pony.hasSpell()) {
-            Spell effect = pony.getSpell(true);
-            if (!effect.isDead() && effect instanceof FlightPredicate) {
-                return ((FlightPredicate)effect).checkCanFly(pony);
-            }
-        }
-
-        return pony.getSpecies().canFly();
-    }
-
-    protected boolean isRainboom() {
-        return Math.sqrt(getHorizontalMotion(pony.getOwner())) > 0.4F;
-    }
-
     @Override
     public PlayerDimensions getDimensions() {
         return dimensions;
     }
 
+    @Override
+    public boolean isFlying() {
+        return isFlyingSurvival && !pony.getOwner().isFallFlying() && !pony.getOwner().hasVehicle();
+    }
+
     @Override
     public void tick() {
         PlayerEntity entity = pony.getOwner();
@@ -83,32 +70,37 @@ public class PlayerPhysics extends EntityPhysics<Pony> implements Tickable, Moti
             entity.setPose(EntityPose.STANDING);
         }
 
-        MutableVector velocity = new MutableVector(entity.getVelocity());
+        final MutableVector velocity = new MutableVector(entity.getVelocity());
 
         boolean creative = entity.abilities.creativeMode || pony.getOwner().isSpectator();
 
-        entity.abilities.allowFlying = checkCanFly();
+        boolean canFly = checkCanFly();
 
         if (!creative) {
-            entity.abilities.flying |= entity.abilities.allowFlying && isFlyingEither;
+            entity.abilities.flying |= (canFly || entity.abilities.allowFlying) && isFlyingEither;
 
-            if ((entity.isOnGround() && entity.isSneaking()) || entity.isTouchingWater()) {
+            if ((entity.isOnGround() && entity.isSneaking()) || entity.isTouchingWater() || entity.horizontalCollision  || entity.verticalCollision) {
                 entity.abilities.flying = false;
             }
-
-
         }
 
         isFlyingSurvival = entity.abilities.flying && !creative;
         isFlyingEither = isFlyingSurvival || (creative && entity.abilities.flying);
 
-        if (!creative && !entity.isFallFlying() && isFlyingSurvival && !entity.hasVehicle()) {
+        if (pony.getPhysics().isGravityNegative()) {
+            entity.setOnGround(!entity.world.isAir(new BlockPos(entity.getX(), entity.getY() + entity.getHeight() + 0.5F, entity.getZ())));
 
-            entity.fallDistance = 0;
+            if (entity.isOnGround() || entity.horizontalCollision) {
+                entity.abilities.flying = false;
+                isFlyingEither = false;
+                isFlyingSurvival = false;
+            }
+        }
 
+        if (isFlying()) {
             int level = pony.getLevel().get() + 1;
 
-            if (ticksInAir > (level * 100)) {
+            if (ticksInAir++ > (level * 100)) {
                 Bar mana = pony.getMagicalReserves().getMana();
 
                 mana.add((int)(-getHorizontalMotion(entity) * 50 / level));
@@ -128,55 +120,91 @@ public class PlayerPhysics extends EntityPhysics<Pony> implements Tickable, Moti
                 }
             }
 
-            moveFlying(entity, velocity);
+            entity.fallDistance = 0;
 
-            if (ticksInAir++ > 0 && ticksInAir % 30 == 0) {
+            moveFlying(entity, velocity);
-                entity.playSound(getWingSound(), 0.5F, 1);
+            if (entity.world.hasRain(entity.getBlockPos())) {
+                applyTurbulance(entity, velocity);
             }
+
+            if (entity.world.isClient && ticksInAir % 20 == 0 && entity.getVelocity().length() < 0.29) {
+                entity.playSound(getWingSound(), 0.5F, 1);
+                thrustScale = 1;
+            }
+            velocity.y -= 0.02;
         } else {
             ticksInAir = 0;
+
+            if (!creative) {
+
+                double horMotion = getHorizontalMotion(entity);
+                double motion = entity.getPos().subtract(lastPos).lengthSquared();
+
+                if (velocity.y > 0 && (horMotion > 0.2 || (motion > 0.2 && velocity.y < -0.2))) {
+                    entity.abilities.flying = true;
+                    isFlyingEither = true;
+                    isFlyingSurvival = true;
+
+                    velocity.y += horMotion + 0.3;
+                    applyThrust(entity, velocity);
                 }
-
-        if (pony.getPhysics().isGravityNegative()) {
-            entity.setOnGround(!entity.world.isAir(new BlockPos(entity.getX(), entity.getY() + entity.getHeight() + 0.5F, entity.getZ())));
-
-            if (entity.isOnGround()) {
-                entity.abilities.flying = false;
-                isFlyingSurvival = false;
             }
         }
 
-        lastTickPosX = entity.getX();
+        lastPos = new Vec3d(entity.getX(), 0, entity.getZ());
-        lastTickPosZ = entity.getZ();
 
         entity.setVelocity(velocity.toImmutable());
     }
 
-    public SoundEvent getWingSound() {
+    private SoundEvent getWingSound() {
         return pony.getSpecies() == Race.CHANGELING ? USounds.CHANGELING_BUZZ : USounds.WING_FLAP;
     }
 
-    protected void moveFlying(Entity player, MutableVector velocity) {
+    protected void moveFlying(PlayerEntity player, MutableVector velocity) {
+        applyThrust(player, velocity);
 
-        float forward = 0.000015F * (1 + (pony.getLevel().get() / 10F)) * (float)Math.sqrt(getHorizontalMotion(player));
+        double motion = getHorizontalMotion(player);
-        boolean sneak = !player.isSneaking();
+
+        float forward = 0.000015F * (1 + (pony.getLevel().get() / 10F)) * (float)Math.sqrt(motion);
 
         // vertical drop due to gravity
-        if (sneak) {
-            velocity.y -= (0.005F - getHorizontalMotion(player) / 100) * getGravitySignum();
-        } else {
         forward += 0.005F;
-            velocity.y -= 0.0001F * getGravitySignum();
+
-        }
+        velocity.y -= (getGravityModifier() * 0.01F) / Math.max(motion * 100, 1);
 
         velocity.x += - forward * MathHelper.sin(player.yaw * 0.017453292F);
         velocity.z += forward * MathHelper.cos(player.yaw * 0.017453292F);
+    }
 
-        if (player.world.hasRain(player.getBlockPos())) {
+    protected void applyThrust(PlayerEntity player, MutableVector velocity) {
+        if (pony.sneakingChanged() && player.isSneaking()) {
+            thrustScale = 1;
+            player.playSound(getWingSound(), 0.5F, 1);
+        } else {
+            thrustScale *= 0.1889F;
+        }
+
+        float thrustStrength = 0.135F * thrustScale;
+        Vec3d direction = player.getRotationVec(1).normalize().multiply(thrustStrength);
+
+        velocity.x += direction.x;
+        velocity.z += direction.z;
+        velocity.y += direction.y * 2.45 + Math.abs(direction.y) * 10;
+
+        if (player.isSneaking()) {
+            velocity.y += 0.4 - 0.25;
+            if (pony.sneakingChanged()) {
+                velocity.y += 0.75;
+            }
+        } else {
+            velocity.y -= 0.1;
+        }
+
+    }
+
+    protected void applyTurbulance(Entity player, MutableVector velocity) {
         float glance = 360 * player.world.random.nextFloat();
-
+        float forward = 0.015F * player.world.random.nextFloat() *  player.world.getRainGradient(1);
-
-            forward = 0.015F * player.world.random.nextFloat() *  player.world.getRainGradient(1);
 
         if (player.world.random.nextInt(30) == 0) {
             forward *= 10;
@@ -203,25 +231,32 @@ public class PlayerPhysics extends EntityPhysics<Pony> implements Tickable, Moti
         velocity.x += - forward * MathHelper.sin((player.yaw + glance) * 0.017453292F);
         velocity.z += forward * MathHelper.cos((player.yaw + glance) * 0.017453292F);
     }
-    }
 
     protected double getHorizontalMotion(Entity e) {
-        double motionX = e.getX() - lastTickPosX;
+        return Entity.squaredHorizontalLength(e.getPos().subtract(lastPos));
-        double motionZ = e.getZ() - lastTickPosZ;
-
-        return (motionX * motionX) + (motionZ * motionZ);
     }
 
-    protected SoundEvent getFallSound(int distance) {
+    private boolean checkCanFly() {
-        return distance > 4 ? SoundEvents.ENTITY_PLAYER_BIG_FALL : SoundEvents.ENTITY_PLAYER_SMALL_FALL;
+        if (pony.getOwner().abilities.creativeMode || pony.getOwner().isSpectator()) {
+            return true;
+        }
+
+        if (pony.hasSpell()) {
+            Spell effect = pony.getSpell(true);
+            if (!effect.isDead() && effect instanceof FlightPredicate) {
+                return ((FlightPredicate)effect).checkCanFly(pony);
+            }
+        }
+
+        return pony.getSpecies().canFly();
     }
 
     public void updateFlightStat(boolean flying) {
         PlayerEntity entity = pony.getOwner();
 
-        entity.abilities.allowFlying = checkCanFly();
+        boolean canFly = checkCanFly();
 
-        if (entity.abilities.allowFlying) {
+        if (canFly || entity.abilities.allowFlying) {
             entity.abilities.flying |= flying;
 
             isFlyingSurvival = entity.abilities.flying;
@@ -248,9 +283,4 @@ public class PlayerPhysics extends EntityPhysics<Pony> implements Tickable, Moti
 
         pony.getOwner().calculateDimensions();
     }
-
-    @Override
-    public boolean isFlying() {
-        return isFlyingSurvival;
-    }
 }