implement block placing and destroying

src/js/net/minecraft/client/GameWindow.js

@@ -1,6 +1,6 @@
 window.GameWindow = class {
 
-    constructor(renderer, canvasWrapperId) {
+    constructor(minecraft, renderer, canvasWrapperId) {
         this.renderer = renderer;
         this.canvasWrapperId = canvasWrapperId;
 
@@ -30,6 +30,9 @@ window.GameWindow = class {
         // Mouse motion
         document.addEventListener('mousemove', event => this.onMouseMove(event), false);
 
+        // Mouse buttons
+        document.addEventListener('click', event => minecraft.onMouseClicked(event.button), false);
+
         // Create keyboard
         Keyboard.create();
     }
@@ -51,7 +54,7 @@ window.GameWindow = class {
     }
 
     onMouseMove(event) {
-        this.mouseMotionX = -event.movementX;
-        this.mouseMotionY = event.movementY;
+        this.mouseMotionX = event.movementX;
+        this.mouseMotionY = -event.movementY;
     }
 }

src/js/net/minecraft/client/Minecraft.js

@@ -5,7 +5,7 @@ window.Minecraft = class {
      */
     constructor(canvasWrapperId) {
         this.worldRenderer = new WorldRenderer(this);
-        this.window = new GameWindow(this.worldRenderer, canvasWrapperId);
+        this.window = new GameWindow(this, this.worldRenderer, canvasWrapperId);
         this.timer = new Timer(20);
 
         this.frames = 0;
@@ -66,6 +66,7 @@ window.Minecraft = class {
     }
 
     onRender(partialTicks) {
+        // Player rotation
         if (this.window.mouseLocked) {
             this.player.turn(this.window.mouseMotionX, this.window.mouseMotionY);
 
@@ -78,7 +79,35 @@ window.Minecraft = class {
     }
 
     onTick() {
+        // Tick the player
         this.player.onTick();
     }
 
+    onMouseClicked(button) {
+        let hitResult = this.player.rayTrace(5, this.timer.partialTicks);
+
+        // Destroy block
+        if (button === 0) {
+            if (hitResult != null) {
+                this.world.setBlockAt(hitResult.x, hitResult.y, hitResult.z, 0);
+            }
+        }
+
+        // Place block
+        if (button === 2) {
+            if (hitResult != null) {
+                let x = hitResult.x + hitResult.face.x;
+                let y = hitResult.y + hitResult.face.y;
+                let z = hitResult.z + hitResult.face.z;
+
+                let placedBoundingBox = new BoundingBox(x, y, z, x + 1, y + 1, z + 1);
+
+                // Don't place blocks if the player is standing there
+                if (!placedBoundingBox.intersects(this.player.boundingBox)) {
+                    this.world.setBlockAt(x, y, z, 1);
+                }
+            }
+        }
+    }
+
 }

src/js/net/minecraft/client/entity/Player.js

@@ -182,7 +182,7 @@ window.Player = class {
         this.motionY = 0.42;
 
         if (this.sprinting) {
-            let radiansYaw = -this.yaw * (Math.PI / 180);
+            let radiansYaw = this.yaw * (Math.PI / 180) + Math.PI;
             this.motionX -= Math.sin(radiansYaw) * 0.2;
             this.motionZ += Math.cos(radiansYaw) * 0.2;
         }
@@ -281,7 +281,7 @@ window.Player = class {
             up = up * distance;
             forward = forward * distance;
 
-            let yawRadians = -this.yaw * (Math.PI / 180);
+            let yawRadians = this.yaw * (Math.PI / 180) + Math.PI;
             let sin = Math.sin(yawRadians);
             let cos = Math.cos(yawRadians);
 
@@ -473,4 +473,41 @@ window.Player = class {
         return this.z - (this.z < 0 ? 1 : 0);
     }
 
+    getPositionEyes(partialTicks) {
+        if (partialTicks === 1.0) {
+            return new Vector3(this.x, this.y + this.getEyeHeight(), this.z);
+        } else {
+            let x = this.prevX + (this.x - this.prevX) * partialTicks;
+            let y = this.prevY + (this.y - this.prevY) * partialTicks + this.getEyeHeight();
+            let z = this.prevZ + (this.z - this.prevZ) * partialTicks;
+            return new Vector3(x, y, z);
+        }
+    }
+
+    /**
+     * interpolated look vector
+     */
+    getLook(partialTicks) {
+        // TODO interpolation
+        return this.getVectorForRotation(this.pitch, this.yaw);
+    }
+
+    /**
+     * Creates a Vec3 using the pitch and yaw of the entities rotation.
+     */
+    getVectorForRotation(pitch, yaw) {
+        let z = Math.cos(-yaw * 0.017453292 - Math.PI);
+        let x = Math.sin(-yaw * 0.017453292 - Math.PI);
+        let xz = -Math.cos(-pitch * 0.017453292);
+        let y = Math.sin(-pitch * 0.017453292);
+        return new Vector3(x * xz, y, z * xz);
+    }
+
+    rayTrace(blockReachDistance, partialTicks) {
+        let from = this.getPositionEyes(partialTicks);
+        let direction = this.getLook(partialTicks);
+        let to = from.addVector(direction.x * blockReachDistance, direction.y * blockReachDistance, direction.z * blockReachDistance);
+        return this.world.rayTraceBlocks(from, to);
+    }
+
 }

src/js/net/minecraft/client/render/BlockRenderer.js

@@ -41,7 +41,7 @@ window.BlockRenderer = class {
         let textureIndex = block.getTextureForFace(face);
         let minU = (textureIndex % 16) / 16.0;
         let maxU = minU + (16 / 256);
-        let minV = Math.round(textureIndex / 16);
+        let minV = Math.floor(textureIndex / 16);
         let maxV = minV + (16 / 256);
 
         // Flip V
@@ -65,25 +65,25 @@ window.BlockRenderer = class {
             this.addBlockCorner(world, face, minX, maxY, minZ, minU, minV);
             this.addBlockCorner(world, face, minX, maxY, maxZ, minU, maxV);
         }
-        if (face === EnumBlockFace.EAST) {
+        if (face === EnumBlockFace.NORTH) {
             this.addBlockCorner(world, face, minX, maxY, minZ, maxU, minV);
             this.addBlockCorner(world, face, maxX, maxY, minZ, minU, minV);
             this.addBlockCorner(world, face, maxX, minY, minZ, minU, maxV);
             this.addBlockCorner(world, face, minX, minY, minZ, maxU, maxV);
         }
-        if (face === EnumBlockFace.WEST) {
+        if (face === EnumBlockFace.SOUTH) {
             this.addBlockCorner(world, face, minX, maxY, maxZ, minU, minV);
             this.addBlockCorner(world, face, minX, minY, maxZ, minU, maxV);
             this.addBlockCorner(world, face, maxX, minY, maxZ, maxU, maxV);
             this.addBlockCorner(world, face, maxX, maxY, maxZ, maxU, minV);
         }
-        if (face === EnumBlockFace.NORTH) {
+        if (face === EnumBlockFace.WEST) {
             this.addBlockCorner(world, face, minX, maxY, maxZ, maxU, minV);
             this.addBlockCorner(world, face, minX, maxY, minZ, minU, minV);
             this.addBlockCorner(world, face, minX, minY, minZ, minU, maxV);
             this.addBlockCorner(world, face, minX, minY, maxZ, maxU, maxV);
         }
-        if (face === EnumBlockFace.SOUTH) {
+        if (face === EnumBlockFace.EAST) {
             this.addBlockCorner(world, face, maxX, minY, maxZ, minU, maxV);
             this.addBlockCorner(world, face, maxX, minY, minZ, maxU, maxV);
             this.addBlockCorner(world, face, maxX, maxY, minZ, maxU, minV);

src/js/net/minecraft/client/render/WorldRenderer.js

@@ -58,8 +58,8 @@ window.WorldRenderer = class {
         let player = this.minecraft.player;
 
         // Rotation
-        this.camera.rotation.y = player.yaw * (Math.PI / 180);
-        this.camera.rotation.x = player.pitch * (Math.PI / 180);
+        this.camera.rotation.y = -player.yaw * (Math.PI / 180) + Math.PI;
+        this.camera.rotation.x = -player.pitch * (Math.PI / 180);
 
         // Position
         let x = player.prevX + (player.x - player.prevX) * partialTicks;
@@ -90,21 +90,14 @@ window.WorldRenderer = class {
     renderChunks(renderer, partialTicks) {
         let world = this.minecraft.world;
 
-        const xKeys = Object.keys(world.chunks)
-        for (let x = 0; x < xKeys.length; x++) {
+        for(let i in world.chunks) {
+            let chunk = world.chunks[i];
 
-            let zArray = world.chunks[xKeys[x]];
-            const zKeys = Object.keys(zArray)
+            for (let y = 0; y < chunk.sections.length; y++) {
+                let section = chunk.sections[y];
 
-            for (let z = 0; z < zKeys.length; z++) {
-                let chunk = zArray[zKeys[z]];
-
-                for (let y = 0; y < chunk.sections.length; y++) {
-                    let section = chunk.sections[y];
-
-                    if (section.dirty) {
-                        section.rebuild(renderer);
-                    }
+                if (section.dirty) {
+                    section.rebuild(renderer);
                 }
             }
         }

src/js/net/minecraft/client/world/World.js

@@ -22,15 +22,15 @@ window.World = class {
         return y < 0 || y > World.TOTAL_HEIGHT ? null : chunk.getSection(y >> 4);
     }
 
-    getCollisionBoxes(aabb) {
+    getCollisionBoxes(region) {
         let boundingBoxList = [];
 
-        let minX = MathHelper.floor_double(aabb.minX);
-        let maxX = MathHelper.floor_double(aabb.maxX + 1.0);
-        let minY = MathHelper.floor_double(aabb.minY);
-        let maxY = MathHelper.floor_double(aabb.maxY + 1.0);
-        let minZ = MathHelper.floor_double(aabb.minZ);
-        let maxZ = MathHelper.floor_double(aabb.maxZ + 1.0);
+        let minX = MathHelper.floor_double(region.minX);
+        let maxX = MathHelper.floor_double(region.maxX + 1.0);
+        let minY = MathHelper.floor_double(region.minY);
+        let maxY = MathHelper.floor_double(region.maxY + 1.0);
+        let minZ = MathHelper.floor_double(region.minZ);
+        let maxZ = MathHelper.floor_double(region.maxZ + 1.0);
 
         for (let x = minX; x < maxX; x++) {
             for (let y = minY; y < maxY; y++) {
@@ -64,16 +64,15 @@ window.World = class {
         return chunkSection == null ? 0 : chunkSection.getBlockAt(x & 15, y & 15, z & 15);
     }
 
-    getChunkAt(x, z) {
-        let zArray = this.chunks[x];
-        if (typeof zArray === 'undefined') {
-            zArray = this.chunks[x] = [];
-        }
+    getChunkSectionAt(chunkX, layerY, chunkZ) {
+        return this.getChunkAt(chunkX, chunkZ).getSection(layerY);
+    }
 
-        let chunk = zArray[z];
+    getChunkAt(x, z) {
+        let index = x + (z << 16);
+        let chunk = this.chunks[index];
         if (typeof chunk === 'undefined') {
-            chunk = new Chunk(this, x, z);
-            this.chunks[x][z] = chunk;
+            this.chunks[index] = chunk = new Chunk(this, x, z);
             this.group.add(chunk.group);
         }
         return chunk;
@@ -99,10 +98,123 @@ window.World = class {
         for (let x = minX; x <= maxX; x++) {
             for (let y = minY; y <= maxY; y++) {
                 for (let z = minZ; z <= maxZ; z++) {
-                    this.getChunkAt(x, y, z).queueForRebuild();
+                    this.getChunkSectionAt(x, y, z).queueForRebuild();
                 }
             }
         }
     }
 
+    rayTraceBlocks(from, to) {
+        let toX = MathHelper.floor_double(to.x);
+        let toY = MathHelper.floor_double(to.y);
+        let toZ = MathHelper.floor_double(to.z);
+
+        let x = MathHelper.floor_double(from.x);
+        let y = MathHelper.floor_double(from.y);
+        let z = MathHelper.floor_double(from.z);
+
+        let blockId = this.getBlockAt(x, y, z);
+        let block = Block.getById(blockId);
+        let hit = block == null ? null : block.collisionRayTrace(x, y, z, from, to);
+
+        if (hit != null) {
+            return hit;
+        }
+
+        let lastHit = null;
+
+        let counter = 200;
+        while (counter-- >= 0) {
+            if (x === toX && y === toY && z === toZ) {
+                return lastHit;
+            }
+
+            let hitX = true;
+            let hitY = true;
+            let hitZ = true;
+
+            let nearestX1 = 999.0;
+            let nearestY1 = 999.0;
+            let nearestZ1 = 999.0;
+
+            if (toX > x) {
+                nearestX1 = x + 1.0;
+            } else if (toX < x) {
+                nearestX1 = x;
+            } else {
+                hitX = false;
+            }
+
+            if (toY > y) {
+                nearestY1 = y + 1.0;
+            } else if (toY < y) {
+                nearestY1 = y;
+            } else {
+                hitY = false;
+            }
+
+            if (toZ > z) {
+                nearestZ1 = z + 1.0;
+            } else if (toZ < z) {
+                nearestZ1 = z;
+            } else {
+                hitZ = false;
+            }
+
+            let nearestX = 999.0;
+            let nearestY = 999.0;
+            let nearestZ = 999.0;
+
+            let diffX = to.x - from.x;
+            let diffY = to.y - from.y;
+            let diffZ = to.z - from.z;
+
+            if (hitX) {
+                nearestX = (nearestX1 - from.x) / diffX;
+            }
+            if (hitY) {
+                nearestY = (nearestY1 - from.y) / diffY;
+            }
+            if (hitZ) {
+                nearestZ = (nearestZ1 - from.z) / diffZ;
+            }
+
+            if (nearestX === -0.0) {
+                nearestX = -1.0E-4;
+            }
+            if (nearestY === -0.0) {
+                nearestY = -1.0E-4;
+            }
+            if (nearestZ === -0.0) {
+                nearestZ = -1.0E-4;
+            }
+
+            let face;
+            if (nearestX < nearestY && nearestX < nearestZ) {
+                face = toX > x ? EnumBlockFace.WEST : EnumBlockFace.EAST;
+                from = new Vector3(nearestX1, from.y + diffY * nearestX, from.z + diffZ * nearestX);
+            } else if (nearestY < nearestZ) {
+                face = toY > y ? EnumBlockFace.BOTTOM : EnumBlockFace.TOP;
+                from = new Vector3(from.x + diffX * nearestY, nearestY1, from.z + diffZ * nearestY);
+            } else {
+                face = toZ > z ? EnumBlockFace.NORTH : EnumBlockFace.SOUTH;
+                from = new Vector3(from.x + diffX * nearestZ, from.y + diffY * nearestZ, nearestZ1);
+            }
+
+            x = MathHelper.floor_double(from.x) - (face === EnumBlockFace.EAST ? 1 : 0);
+            y = MathHelper.floor_double(from.y) - (face === EnumBlockFace.TOP ? 1 : 0);
+            z = MathHelper.floor_double(from.z) - (face === EnumBlockFace.SOUTH ? 1 : 0);
+
+            let blockId = this.getBlockAt(x, y, z);
+            let block = Block.getById(blockId);
+            let hit = block == null ? null : block.collisionRayTrace(x, y, z, from, to);
+            if (hit != null) {
+                return hit;
+            }
+        }
+
+        return lastHit;
+
+    }
+
 }

src/js/net/minecraft/client/world/block/Block.js

@@ -51,6 +51,117 @@ window.Block = class {
         return this.boundingBox;
     }
 
+    collisionRayTrace(x, y, z, start, end) {
+        start = start.addVector(-x, -y, -z);
+        end = end.addVector(-x, -y, -z);
+
+        let vec3 = start.getIntermediateWithXValue(end, this.boundingBox.minX);
+        let vec31 = start.getIntermediateWithXValue(end, this.boundingBox.maxX);
+        let vec32 = start.getIntermediateWithYValue(end, this.boundingBox.minY);
+        let vec33 = start.getIntermediateWithYValue(end, this.boundingBox.maxY);
+        let vec34 = start.getIntermediateWithZValue(end, this.boundingBox.minZ);
+        let vec35 = start.getIntermediateWithZValue(end, this.boundingBox.maxZ);
+
+        if (!this.isVecInsideYZBounds(vec3)) {
+            vec3 = null;
+        }
+
+        if (!this.isVecInsideYZBounds(vec31)) {
+            vec31 = null;
+        }
+
+        if (!this.isVecInsideXZBounds(vec32)) {
+            vec32 = null;
+        }
+
+        if (!this.isVecInsideXZBounds(vec33)) {
+            vec33 = null;
+        }
+
+        if (!this.isVecInsideXYBounds(vec34)) {
+            vec34 = null;
+        }
+
+        if (!this.isVecInsideXYBounds(vec35)) {
+            vec35 = null;
+        }
+
+        let vec36 = null;
+        if (vec3 != null && (vec36 == null || start.squareDistanceTo(vec3) < start.squareDistanceTo(vec36))) {
+            vec36 = vec3;
+        }
+        if (vec31 != null && (vec36 == null || start.squareDistanceTo(vec31) < start.squareDistanceTo(vec36))) {
+            vec36 = vec31;
+        }
+        if (vec32 != null && (vec36 == null || start.squareDistanceTo(vec32) < start.squareDistanceTo(vec36))) {
+            vec36 = vec32;
+        }
+        if (vec33 != null && (vec36 == null || start.squareDistanceTo(vec33) < start.squareDistanceTo(vec36))) {
+            vec36 = vec33;
+        }
+        if (vec34 != null && (vec36 == null || start.squareDistanceTo(vec34) < start.squareDistanceTo(vec36))) {
+            vec36 = vec34;
+        }
+        if (vec35 != null && (vec36 == null || start.squareDistanceTo(vec35) < start.squareDistanceTo(vec36))) {
+            vec36 = vec35;
+        }
+
+        if (vec36 == null) {
+            return null;
+        }
+
+        let face = null;
+        if (vec36 === vec3) {
+            face = EnumBlockFace.WEST;
+        }
+        if (vec36 === vec31) {
+            face = EnumBlockFace.EAST;
+        }
+        if (vec36 === vec32) {
+            face = EnumBlockFace.BOTTOM;
+        }
+        if (vec36 === vec33) {
+            face = EnumBlockFace.TOP;
+        }
+        if (vec36 === vec34) {
+            face = EnumBlockFace.NORTH;
+        }
+        if (vec36 === vec35) {
+            face = EnumBlockFace.SOUTH;
+        }
+        return new MovingObjectPosition(vec36.addVector(x, y, z), face, x, y, z);
+    }
+
+    /**
+     * Checks if a vector is within the Y and Z bounds of the block.
+     */
+    isVecInsideYZBounds(point) {
+        return point == null ? false : point.y >= this.boundingBox.minY
+            && point.y <= this.boundingBox.maxY
+            && point.z >= this.boundingBox.minZ
+            && point.z <= this.boundingBox.maxZ;
+    }
+
+    /**
+     * Checks if a vector is within the X and Z bounds of the block.
+     */
+    isVecInsideXZBounds(point) {
+        return point == null ? false : point.x >= this.boundingBox.minX
+            && point.x <= this.boundingBox.maxX
+            && point.z >= this.boundingBox.minZ
+            && point.z <= this.boundingBox.maxZ;
+    }
+
+    /**
+     * Checks if a vector is within the X and Y bounds of the block.
+     */
+    isVecInsideXYBounds(point) {
+        return point == null ? false : point.x >= this.boundingBox.minX
+            && point.x <= this.boundingBox.maxX
+            && point.y >= this.boundingBox.minY
+            && point.y <= this.boundingBox.maxY;
+    }
+
     static getById(typeId) {
         return Block.blocks[typeId];
     }

src/js/net/minecraft/util/BoundingBox.js

@@ -243,7 +243,6 @@ window.BoundingBox = class {
         this.maxZ += z;
     }
 
-
     /**
      * Create a new bounding box with the given offset
      *

src/js/net/minecraft/util/EnumBlockFace.js

@@ -38,8 +38,8 @@ window.EnumBlockFace = class {
     let c = window.EnumBlockFace;
     c.TOP = new EnumBlockFace(0, 1, 0);
     c.BOTTOM = new EnumBlockFace(0, -1, 0);
-    c.NORTH = new EnumBlockFace(-1, 0, 0);
-    c.EAST = new EnumBlockFace(0, 0, -1);
-    c.SOUTH = new EnumBlockFace(1, 0, 0);
-    c.WEST = new EnumBlockFace(0, 0, 1);
+    c.NORTH = new EnumBlockFace(0, 0, -1);
+    c.EAST = new EnumBlockFace(1, 0, 0);
+    c.SOUTH = new EnumBlockFace(0, 0, 1);
+    c.WEST = new EnumBlockFace(-1, 0, 0);
 }

src/js/net/minecraft/util/MovingObjectPosition.js

@@ -0,0 +1,11 @@
+window.MovingObjectPosition = class {
+
+    constructor(vector, face, x, y, z) {
+        this.vector = vector;
+        this.face = face;
+
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+}

src/js/net/minecraft/util/Timer.js

@@ -1,49 +1,35 @@
 window.Timer = class {
 
+    static MS_PER_SECOND = 1000;
+    static MAX_MS_PER_UPDATE = 1000;
+    static MAX_TICKS_PER_UPDATE = 100;
+
     /**
      * Timer to control the tick speed independently of the framerate
      *
      * @param ticksPerSecond Amount of ticks per second
      */
     constructor(ticksPerSecond) {
-        this.MS_PER_SECOND = 1000;
-        this.MAX_MS_PER_UPDATE = 1000;
-        this.MAX_TICKS_PER_UPDATE = 100;
-
-        /**
-         * Amount of ticks per second
-         */
+        // Amount of ticks per second
         this.ticksPerSecond = ticksPerSecond;
 
-        /**
-         * Last time updated in nano seconds
-         */
-        this.lastTime = this._nanoTime();
+        // Last time updated in milliseconds
+        this.lastTime = Date.now();
 
-        /**
-         * Scale the tick speed
-         */
+        // Scale the tick speed
         this.timeScale = 1.0;
 
-        /**
-         * Framerate of the advanceTime update
-         */
+        // Framerate of the advanceTime update
         this.fps = 0.0;
 
-        /**
-         * Passed time since last game update
-         */
+        // Passed time since last game update
         this.passedTime = 0.0;
 
-        /**
-         * The amount of ticks for the current game update.
-         * It's the passed time as an integer
-         */
+        // The amount of ticks for the current game update.
+        // It's the passed time as an integer
         this.ticks = 0;
 
-        /**
-         * The overflow of the current tick, caused by casting the passed time to an integer
-         */
+        // The overflow of the current tick, caused by casting the passed time to an integer
         this.partialTicks = 0;
     }
 
@@ -53,7 +39,7 @@ window.Timer = class {
      * Call this function in the main render loop of the game
      */
     advanceTime() {
-        let now = this._nanoTime();
+        let now = Date.now();
         let passedMs = now - this.lastTime;
 
         // Store nano time of this update
@@ -61,24 +47,20 @@ window.Timer = class {
 
         // Maximum and minimum
         passedMs = Math.max(0, passedMs);
-        passedMs = Math.min(this.MAX_MS_PER_UPDATE, passedMs);
+        passedMs = Math.min(Timer.MAX_MS_PER_UPDATE, passedMs);
 
         // Calculate fps
-        this.fps = this.MS_PER_SECOND / passedMs;
+        this.fps = Timer.MS_PER_SECOND / passedMs;
 
         // Calculate passed time and ticks
-        this.passedTime += passedMs * this.timeScale * this.ticksPerSecond / this.MS_PER_SECOND;
+        this.passedTime += passedMs * this.timeScale * this.ticksPerSecond / Timer.MS_PER_SECOND;
         this.ticks = parseInt(this.passedTime);
 
         // Maximum ticks per update
-        this.ticks = Math.min(this.MAX_TICKS_PER_UPDATE, this.ticks);
+        this.ticks = Math.min(Timer.MAX_TICKS_PER_UPDATE, this.ticks);
 
         // Calculate the overflow of the current tick
         this.passedTime -= this.ticks;
         this.partialTicks = this.passedTime;
     }
-
-    _nanoTime() {
-        return Date.now();
-    }
 }

src/js/net/minecraft/util/Vector3.js

@@ -0,0 +1,72 @@
+window.Vector3 = class {
+
+    constructor(x = 0, y = 0, z = 0) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+
+
+    addVector(x, y, z) {
+        return new Vector3(this.x + x, this.y + y, this.z + z);
+    }
+
+    squareDistanceTo(vec) {
+        let d0 = vec.x - this.x;
+        let d1 = vec.y - this.y;
+        let d2 = vec.z - this.z;
+        return d0 * d0 + d1 * d1 + d2 * d2;
+    }
+
+    /**
+     * Returns a new vector with x value equal to the second parameter, along the line between this vector and the
+     * passed in vector, or null if not possible.
+     */
+    getIntermediateWithXValue(vec, x) {
+        let d0 = vec.x - this.x;
+        let d1 = vec.y - this.y;
+        let d2 = vec.z - this.z;
+
+        if (d0 * d0 < 1.0000000116860974E-7) {
+            return null;
+        } else {
+            let d3 = (x - this.x) / d0;
+            return d3 >= 0.0 && d3 <= 1.0 ? new Vector3(this.x + d0 * d3, this.y + d1 * d3, this.z + d2 * d3) : null;
+        }
+    }
+
+    /**
+     * Returns a new vector with y value equal to the second parameter, along the line between this vector and the
+     * passed in vector, or null if not possible.
+     */
+    getIntermediateWithYValue(vec, y) {
+        let d0 = vec.x - this.x;
+        let d1 = vec.y - this.y;
+        let d2 = vec.z - this.z;
+
+        if (d1 * d1 < 1.0000000116860974E-7) {
+            return null;
+        } else {
+            let d3 = (y - this.y) / d1;
+            return d3 >= 0.0 && d3 <= 1.0 ? new Vector3(this.x + d0 * d3, this.y + d1 * d3, this.z + d2 * d3) : null;
+        }
+    }
+
+    /**
+     * Returns a new vector with z value equal to the second parameter, along the line between this vector and the
+     * passed in vector, or null if not possible.
+     */
+    getIntermediateWithZValue(vec, z) {
+        let d0 = vec.x - this.x;
+        let d1 = vec.y - this.y;
+        let d2 = vec.z - this.z;
+
+        if (d2 * d2 < 1.0000000116860974E-7) {
+            return null;
+        } else {
+            let d3 = (z - this.z) / d2;
+            return d3 >= 0.0 && d3 <= 1.0 ? new Vector3(this.x + d0 * d3, this.y + d1 * d3, this.z + d2 * d3) : null;
+        }
+    }
+
+}

src/start.js

@@ -49,6 +49,8 @@ loadScripts([
     // Minecraft Source
     "src/js/net/minecraft/util/EnumBlockFace.js",
     "src/js/net/minecraft/util/Timer.js",
+    "src/js/net/minecraft/util/Vector3.js",
+    "src/js/net/minecraft/util/MovingObjectPosition.js",
     "src/js/net/minecraft/util/MathHelper.js",
     "src/js/net/minecraft/util/BoundingBox.js",
     "src/js/net/minecraft/util/Keyboard.js",