Hello,
This is my first time using the UE4. I am working on creating a basic 2D procedural level generation inside UE4 with c++
I am referring to the code here -> GameDev-Final-Project/BSP.cpp at master · vforeman/GameDev-Final-Project · GitHub
I implemented the algorithm with a normal c++ compiler and it works well. However I am facing some issues making it work in UE4.
My splitting of leaf logic works fine. I am getting stuck implementing this block of code below. The UPartition build() logic. It would run once or twice but after that the whole engine just crashes. If I remove the while loop it won’t crash anymore and the for loop would run once. I guess it could be an infinite loop or some initialization error but I am not quite able to figure it out. Also the way I structured the classes is different. I am extending all my base classes from unreal UObject.
#include "BSPTryoutOne.h"
#include "Partition.h"
UPartition::UPartition(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)
{
root = ConstructObject<ULeafObject>(ULeafObject::StaticClass());
root->setProperties(0, 0, MAPHEIGHT, MAPWIDTH);
leavesList.push_back(root);
}
void UPartition::build()
{
int partitions = 0;
while (partitions < 5)
{
partitions++;
UE_LOG(LogTemp, Warning, TEXT(" LEAF LIST SIZE BEFORE %d "), leavesList.size());
for (auto helper : leavesList)
{
if (leavesList.size() > 0)
{
if (helper->leftChild == NULL && helper->rightChild == NULL)
{
if (helper->split())
{
leavesList.push_back(helper->leftChild);
leavesList.push_back(helper->rightChild);
UE_LOG(LogTemp, Warning, TEXT(" LEFT child X Y HEIGHT WIDTH %d %d %d %d"), helper->leftChild->x, helper->leftChild->y, helper->leftChild->height, helper->leftChild->width);
UE_LOG(LogTemp, Warning, TEXT(" Right child X Y HEIGHT WIDTH %d %d %d %d"), helper->rightChild->x, helper->rightChild->y, helper->rightChild->height, helper->rightChild->width);
}
}
}
}
UE_LOG(LogTemp, Warning, TEXT(" LEAF LIST SIZE AFTER %d "), leavesList.size());
}
}
Here is my LeafObject data structure
UCLASS()
class BSPTRYOUTONE_API ULeafObject : public UObject
{
GENERATED_BODY()
public:
ULeafObject(const FObjectInitializer& ObjectInitializer);
int width, height, x, y;
ULeafObject* leftChild;
ULeafObject* rightChild;
bool split();
void createRooms();
void setProperties(int x, int y, int height, int width);
static const int MAX_LEAF_SIZE = 20;
static const int MIN_LEAF_SIZE = 6;
};
And my LeafObject.cpp
#include "BSPTryoutOne.h"
#include "LeafObject.h"
ULeafObject::ULeafObject(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)
{
}
void ULeafObject::setProperties(int a, int b, int h, int w)
{
ULeafObject::x = a;
ULeafObject::y = b;
ULeafObject::height = h;
ULeafObject::width = w;
//UE_LOG(LogTemp, Warning, TEXT("INSIDE SET PROPERTIES, WIDTH HEIGHT X Y %d %d %d %d"), x, y, width, height);
}
bool ULeafObject::split()
{
//both childs have to be NULL
if (leftChild != NULL || rightChild != NULL) return false;
bool splitH;
splitH = util::coinToss();
if (width > height && height / width >= 0.05)splitH = false;
else if (height > width && width / height >= 0.05)splitH = true;
int max = (splitH ? height : width) - MIN_LEAF_SIZE;
if (max < MIN_LEAF_SIZE) return false;
int split = util::randomRange(MIN_LEAF_SIZE, max);
if (splitH)
{
//UE_LOG(LogTemp, Warning, TEXT("SPLIT H H H H H "));
leftChild = ConstructObject<ULeafObject>(ULeafObject::StaticClass());
leftChild->setProperties(x, y, split, width);
//UE_LOG(LogTemp, Warning, TEXT(" LEFT SPLIT VALUES X Y HEIGHT WIDTH %d %d %d %d"), x, y, split, width);
//UE_LOG(LogTemp, Warning, TEXT(" LEFT child X Y HEIGHT WIDTH %d %d %d %d"), leftChild->x, leftChild->y, leftChild->height, leftChild->width);
rightChild = ConstructObject<ULeafObject>(ULeafObject::StaticClass());
rightChild->setProperties(x, y + split, height - split, width);
//UE_LOG(LogTemp, Warning, TEXT(" RIGHT SPLIT VALUES X Y HEIGHT WIDTH %d %d %d %d"), x, y + split, height - split, width);
//UE_LOG(LogTemp, Warning, TEXT(" Right child X Y HEIGHT WIDTH %d %d %d %d"), rightChild->x, rightChild->y, rightChild->height, rightChild->width);
}
else
{
//UE_LOG(LogTemp, Warning, TEXT("SPLIT V V V V V "));
leftChild = ConstructObject<ULeafObject>(ULeafObject::StaticClass());
leftChild->setProperties(x, y, height, split);
// UE_LOG(LogTemp, Warning, TEXT(" LEFT SPLIT VALUES X Y HEIGHT WIDTH %d %d %d %d"), x, y, height, split);
// UE_LOG(LogTemp, Warning, TEXT(" LEFT child X Y HEIGHT WIDTH %d %d %d %d"), leftChild->x, leftChild->y, leftChild->height, leftChild->width);
rightChild = ConstructObject<ULeafObject>(ULeafObject::StaticClass());
rightChild->setProperties(x + split, y , height, width - split);
// UE_LOG(LogTemp, Warning, TEXT(" Right SPLIT VALUES X Y HEIGHT WIDTH %d %d %d %d"), x + split, y, height, width - split);
// UE_LOG(LogTemp, Warning, TEXT(" Right child X Y HEIGHT WIDTH %d %d %d %d"), rightChild->x, rightChild->y, rightChild->height, rightChild->width);
}
return true;
}
I read somewhere on initialized constructors for UObject classes using FObjectInitializer. I am not sure if the problem lies here or somewhere else.
Any ideas?
Thanks!