start work on boundingBox (#228) : soulsand seems to work

lib/plugins/physics.js

@@ -68,6 +68,12 @@ function inject(bot) {
     doPhysicsTimer = null;
   }
 
+  function typeToBlockHeight(type)
+  {
+    if(type===88) return 7/8;
+    else return 1;
+  }
+
   function nextFrame(deltaSeconds) {
     if(deltaSeconds < EPSILON) return; // too fast
     var pos = bot.entity.position;
@@ -128,7 +134,7 @@ function inject(bot) {
 
     // limit speed
     var currentMaxGroundSpeed;
-    var underBlock=bot.blockAt(pos.offset(0,-1,0));
+    var underBlock=bot.blockAt(new Vec3(pos.x,Math.ceil(pos.y-1.002),pos.z));
     if(underBlock && underBlock.type===88)
       currentMaxGroundSpeed=physics.maxGroundSpeedSoulSand;
     else
@@ -170,15 +176,16 @@ function inject(bot) {
       }
     }
 
-
     bot.entity.onGround = false;
     if(vel.y !== 0) {
       pos.y += vel.y * deltaSeconds;
       var playerHalfHeight = physics.playerHeight / 2;
-      var blockY = Math.floor(pos.y + playerHalfHeight + math.sign(vel.y) * playerHalfHeight);
+      var aBlockY=pos.y + playerHalfHeight + math.sign(vel.y) * playerHalfHeight;
+      var blockY = Math.floor(aBlockY);
       boundingBoxMin = new Vec3(boundingBox.min.x, blockY, boundingBox.min.z);
       boundingBoxMax = new Vec3(boundingBox.max.x, blockY, boundingBox.max.z);
-      if(collisionInRange(boundingBoxMin, boundingBoxMax)) {
+      var highestBlock=collisionInRangeHighest(boundingBoxMin,boundingBoxMax);
+      if(highestBlock!==-1 && highestBlock>=(aBlockY-blockY)) {
         pos.y = blockY + (vel.y < 0 ? 1 : -physics.playerHeight) * 1.001;
         bot.entity.onGround = vel.y < 0 ? true : bot.entity.onGround;
         vel.y = 0;
@@ -206,6 +213,22 @@ function inject(bot) {
     return false;
   }
 
+
+  function collisionInRangeHighest(boundingBoxMin, boundingBoxMax) {
+    var cursor = new Vec3(0, 0, 0);
+    var block;
+    var max=-1;
+    for(cursor.x = boundingBoxMin.x; cursor.x <= boundingBoxMax.x; cursor.x++) {
+      for(cursor.y = boundingBoxMin.y; cursor.y <= boundingBoxMax.y; cursor.y++) {
+        for(cursor.z = boundingBoxMin.z; cursor.z <= boundingBoxMax.z; cursor.z++) {
+          block = bot.blockAt(cursor);
+          if(block && block.boundingBox === 'block') max=Math.max(max,typeToBlockHeight(block.type));
+        }
+      }
+    }
+    return max;
+  }
+
   function calcGroundSpeedSquared() {
     var vel = bot.entity.velocity;
     return vel.x * vel.x + vel.z * vel.z;
@@ -216,7 +239,7 @@ function inject(bot) {
     return {
       min: new Vec3(
         pos.x - physics.playerApothem,
-        pos.y,
+        Math.ceil(pos.y-0.002),
         pos.z - physics.playerApothem
       ).floor(),
       max: new Vec3(