/** Updates the status if the entity is currently swimming (in water). */
private void updateSwimStatus() {
ArrayList<BlockPosition> blockPositions = gatherAdjacentBlockPositions(getPosition());
boolean swimming = false, headUnderWater = false;
for (int i = 0; i < blockPositions.size(); i++) {
BlockPosition p = blockPositions.get(i);
byte blockType = _parent.getWorldProvider().getBlockAtPosition(new Vector3d(p.x, p.y, p.z));
AABB blockAABB = Block.AABBForBlockAt(p.x, p.y, p.z);
if (BlockManager.getInstance().getBlock(blockType).isLiquid()
&& getAABB().overlaps(blockAABB)) {
swimming = true;
}
Vector3d eyePos = calcEyePosition();
eyePos.y += 0.25;
if (BlockManager.getInstance().getBlock(blockType).isLiquid() && blockAABB.contains(eyePos)) {
headUnderWater = true;
}
}
_headUnderWater = headUnderWater;
_isSwimming = swimming;
}
/**
* Checks for blocks around the entity.
*
* @param origin The original position of the entity
* @return True if the entity is colliding horizontally
*/
private boolean horizontalHitTest(Vector3d origin) {
boolean result = false;
ArrayList<BlockPosition> blockPositions = gatherAdjacentBlockPositions(origin);
// Check each block position for collision
for (int i = 0; i < blockPositions.size(); i++) {
BlockPosition p = blockPositions.get(i);
byte blockType = _parent.getWorldProvider().getBlockAtPosition(new Vector3d(p.x, p.y, p.z));
AABB blockAABB = Block.AABBForBlockAt(p.x, p.y, p.z);
if (!BlockManager.getInstance().getBlock(blockType).isPenetrable()) {
if (getAABB().overlaps(blockAABB)) {
result = true;
// Calculate the direction from the origin to the current position
Vector3d direction = new Vector3d(getPosition().x, 0f, getPosition().z);
direction.x -= origin.x;
direction.z -= origin.z;
// Calculate the point of intersection on the block's AABB
Vector3d blockPoi = blockAABB.closestPointOnAABBToPoint(origin);
Vector3d entityPoi = generateAABBForPosition(origin).closestPointOnAABBToPoint(blockPoi);
Vector3d planeNormal =
blockAABB.normalForPlaneClosestToOrigin(blockPoi, origin, true, false, true);
// Find a vector parallel to the surface normal
Vector3d slideVector = new Vector3d(planeNormal.z, 0, -planeNormal.x);
Vector3d pushBack = new Vector3d();
pushBack.sub(blockPoi, entityPoi);
// Calculate the intensity of the diversion alongside the block
double length = slideVector.dot(direction);
Vector3d newPosition = new Vector3d();
newPosition.z = origin.z + pushBack.z * 0.2 + length * slideVector.z;
newPosition.x = origin.x + pushBack.x * 0.2 + length * slideVector.x;
newPosition.y = origin.y;
// Update the position
getPosition().set(newPosition);
}
}
}
return result;
}
/**
* Checks for blocks below and above the entity.
*
* @param origin The origin position of the entity
* @return True if a vertical collision was detected
*/
private boolean verticalHitTest(Vector3d origin) {
ArrayList<BlockPosition> blockPositions = gatherAdjacentBlockPositions(origin);
for (int i = 0; i < blockPositions.size(); i++) {
BlockPosition p = blockPositions.get(i);
byte blockType1 = _parent.getWorldProvider().getBlockAtPosition(new Vector3d(p.x, p.y, p.z));
AABB entityAABB = getAABB();
if (BlockManager.getInstance().getBlock(blockType1).isPenetrable()
|| !entityAABB.overlaps(Block.AABBForBlockAt(p.x, p.y, p.z))) continue;
double direction = origin.y - getPosition().y;
if (direction >= 0) getPosition().y = p.y + 0.50001f + entityAABB.getDimensions().y;
else getPosition().y = p.y - 0.50001f - entityAABB.getDimensions().y;
return true;
}
return false;
}