Function ItemPushItem

TombEngine/Game/collision/collide_item.cpp:622–742

}

bool ItemPushItem(ItemInfo* item0, ItemInfo* item1, CollisionInfo* coll, bool enableSpasm, char bigPushFlags)
{
	constexpr auto SOFT_PUSH_LERP_ALPHA = 0.25f;

	const auto& object = Objects[item0->ObjectNumber];

	auto deltaPos = item1->Pose.Position - item0->Pose.Position;

	// Rotate relative position into item frame.
	auto rotMatrix = Matrix::CreateRotationY(TO_RAD(-item0->Pose.Orientation.y));
	auto relDeltaPos = Vector3i(Vector3::Transform(deltaPos.ToVector3(), rotMatrix));

	const auto& bounds = (bigPushFlags & 2) ? GlobalCollisionBounds : GameBoundingBox(item0);
	int minX = bounds.X1;
	int maxX = bounds.X2;
	int minZ = bounds.Z1;
	int maxZ = bounds.Z2;

	if (bigPushFlags & 1)
	{
		minX -= coll->Setup.Radius;
		maxX += coll->Setup.Radius;
		minZ -= coll->Setup.Radius;
		maxZ += coll->Setup.Radius;
	}

	// Big enemies.
	if (abs(deltaPos.x) > BLOCK(4.5f) || abs(deltaPos.z) > BLOCK(4.5f) ||
		relDeltaPos.x <= minX || relDeltaPos.x >= maxX ||
		relDeltaPos.z <= minZ || relDeltaPos.z >= maxZ)
	{
		return false;
	}

	int front = maxZ - relDeltaPos.z;
	int back = relDeltaPos.z - minZ;
	int left = relDeltaPos.x - minX;
	int right = maxX - relDeltaPos.x;

	// Account for collision radius.
	if (right <= left && right <= front && right <= back)
	{
		relDeltaPos.x += right;
	}
	else if (left <= right && left <= front && left <= back)
	{
		relDeltaPos.x -= left;
	}
	else if (front <= left && front <= right && front <= back)
	{
		relDeltaPos.z += front;
	}
	else
	{
		relDeltaPos.z -= back;
	}

	// Lerp to new position.