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BVH Cleanup / Changes. 

Working on fixing issues with the BVH implementation.
Commiting a working changes version. Code has been cleaned up considerably.
A proper code review is nessacary in the near future.
main
Brett 2022-11-13 13:03:48 -05:00
parent 9e533a86f6
commit 7a09800c40
29 changed files with 275 additions and 262 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

0
Step 3/cmake-build-release/.cmake/api/v1/reply/index-2022-11-13T07-14-48-0300.json → Step 3/cmake-build-release/.cmake/api/v1/reply/index-2022-11-13T16-55-19-0563.json
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Step 3/cmake-build-release/Testing/Temporary/LastTest.log
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@ -1,3 +1,3 @@
Start testing: Nov 13 03:00 EST
Start testing: Nov 13 13:02 EST
----------------------------------------------------------
End testing: Nov 13 03:00 EST
End testing: Nov 13 13:02 EST

2
Step 3/cmake-build-release/imgui.ini
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@ -9,7 +9,7 @@ Size=550,680
Collapsed=1
[Window][Debug Menu]
Pos=28,35
Pos=26,34
Size=339,226
Collapsed=0

87
Step 3/include/engine/math/bvh.h
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@ -10,19 +10,30 @@
#include "engine/types.h"
#include <utility>
#include <cassert>
// A currently pure header implementation of a BVH. TODO: make source file.
// this is also for testing and might not make it into the step 2.
namespace Raytracing {
struct BVHObject {
Object* ptr = nullptr;
AABB aabb;
};
struct BVHPartitionedSpace {
std::vector<BVHObject> left;
std::vector<BVHObject> right;
};
struct BVHNode {
public:
std::vector<Object*> objs;
std::vector<BVHObject> objs;
AABB aabb;
BVHNode* left;
BVHNode* right;
BVHNode(std::vector<Object*> objs, AABB aabb, BVHNode* left, BVHNode* right): objs(std::move(objs)), aabb(std::move(aabb)),
BVHNode(std::vector<BVHObject> objs, AABB aabb, BVHNode* left, BVHNode* right): objs(std::move(objs)), aabb(std::move(aabb)),
left(left), right(right) {}
~BVHNode() {
delete (left);
@ -35,42 +46,30 @@ namespace Raytracing {
const int MAX_TREE_DEPTH = 50;
BVHNode* root = nullptr;
void del() {
// delete copied objects
for (auto* obj : root->objs)
delete(obj);
delete (root);
}
// splits the objs in the vector based on the provided AABBs
static std::pair<std::vector<Object*>, std::vector<Object*>>
partition(const std::pair<AABB, AABB>& aabbs, const std::vector<Object*>& objs) {
std::vector<Object*> a1;
std::vector<Object*> a2;
for (auto* obj: objs) {
static BVHPartitionedSpace partition(const std::pair<AABB, AABB>& aabbs, const std::vector<BVHObject>& objs) {
BVHPartitionedSpace space;
for (const auto& obj: objs) {
// if this object doesn't have an AABB, we cannot use a BVH on it
if (obj->getAABB().isEmpty()) {
throw std::runtime_error("Invalid AABB provided to the BVH! (Your implementation is flawed)");
// If this ever fails we have a problem with the implementation.
assert(obj.aabb.isEmpty());
if (obj.aabb.intersects(aabbs.first)) {
space.left.push_back(obj);
} else if (obj.aabb.intersects(aabbs.second)) {
space.right.push_back(obj);
}
if (obj->getAABB().intersects(aabbs.first)) {
a1.push_back(obj);
} else if (obj->getAABB().intersects(aabbs.second)) {
a2.push_back(obj);
}
//tlog << "OBJ: " << obj->getAABB() << " " << obj->getAABB().intersects(aabbs.first) << " " << obj->getAABB().intersects(aabbs.second) << " " << objs.size() << "\n";
}
//tlog << "we split into two of sizes: " << a1.size() << " " << a2.size() << " orig size: " << (a1.size() + a2.size()) << "\n";
return {a1, a2};
return space;
}
BVHNode* addObjectsRecur(const std::vector<Object*>& objects, unsigned long prevSize) {
BVHNode* addObjectsRecur(const std::vector<BVHObject>& objects, unsigned long prevSize) {
//ilog << "size: " << objects.size() << "\n";
// prevSize was required to solve some really weird bugs
// which are a TODO:
if ((objects.size() <= 2 && !objects.empty()) || prevSize == objects.size()) {
AABB local;
for (const auto& obj: objects)
local = local.expand(obj->getAABB());
local = local.expand(obj.aabb);
return new BVHNode(objects, local, nullptr, nullptr);
} else if (objects.empty()) // should never reach here!!
return nullptr;
@ -81,26 +80,24 @@ namespace Raytracing {
AABB world;
for (const auto& obj: objects) {
//tlog << obj->getAABB();
world = world.expand(obj->getAABB());
world = world.expand(obj.aabb);
}
//tlog << "\n";
// then split and partition the world
auto spltAABB = world.splitByLongestAxis();
//dlog << "We have " << world << " being split into: \n\t" << spltAABB.first << "\n\t" << spltAABB.second << "\n";
auto partitionedObjs = partition(spltAABB, objects);
auto splitAABBs = world.splitByLongestAxis();
auto partitionedObjs = partition(splitAABBs, objects);
BVHNode* left = nullptr;
BVHNode* right = nullptr;
// don't try to explore nodes which don't have anything in them.
if (!partitionedObjs.first.empty())
left = addObjectsRecur(partitionedObjs.first, objects.size());
if (!partitionedObjs.second.empty())
right = addObjectsRecur(partitionedObjs.second, objects.size());
if (!partitionedObjs.left.empty())
left = addObjectsRecur(partitionedObjs.left, objects.size());
if (!partitionedObjs.right.empty())
right = addObjectsRecur(partitionedObjs.right, objects.size());
return new BVHNode(objects, world, left, right);
}
static std::vector<Object*>
traverseFindRayIntersection(BVHNode* node, const Ray& ray, PRECISION_TYPE min, PRECISION_TYPE max) {
static std::vector<BVHObject> traverseFindRayIntersection(BVHNode* node, const Ray& ray, PRECISION_TYPE min, PRECISION_TYPE max) {
// check for intersections on both sides of the tree
if (node->left != nullptr) {
if (node->left->aabb.intersects(ray, min, max))
@ -125,30 +122,32 @@ namespace Raytracing {
void addObjects(const std::vector<Object*>& objects) {
if (root != nullptr)
del();
throw std::runtime_error("BVHTree already exists. What are you trying to do?");
// move all the object's aabb's into world position
std::vector<Object*> objs;
std::vector<BVHObject> objs;
for (auto* obj: objects) {
// we don't want to store all the AABBs which don't exist
// ie spheres
if (obj->getAABB().isEmpty()) {
//tlog << "Goodbye\n";
noAABBObjects.push_back(obj);
continue;
}
Object* objCopy = obj->clone();
objCopy->setAABB(obj->getAABB().translate(obj->getPosition()));
objs.push_back(objCopy);
BVHObject bvhObject;
// returns a copy of the AABB object and assigns it in to the tree storage object
bvhObject.aabb = obj->getAABB().translate(obj->getPosition());
// which means we don't have to do memory management, since we are using the pointer without ownership or coping now.
bvhObject.ptr = obj;
objs.push_back(bvhObject);
}
root = addObjectsRecur(objs, -1);
}
std::vector<Object*> rayIntersect(const Ray& ray, PRECISION_TYPE min, PRECISION_TYPE max) {
std::vector<BVHObject> rayIntersect(const Ray& ray, PRECISION_TYPE min, PRECISION_TYPE max) {
return traverseFindRayIntersection(root, ray, min, max);
}
~BVHTree() {
del();
delete (root);
}
};

9
Step 3/include/engine/math/colliders.h
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@ -14,11 +14,8 @@ namespace Raytracing {
protected:
Vec4 min;
Vec4 max;
bool empty = false;
public:
AABB() {
empty = true;
};
AABB(): min({0,0,0}), max({0,0,0}) {};
AABB(PRECISION_TYPE minX, PRECISION_TYPE minY, PRECISION_TYPE minZ, PRECISION_TYPE maxX, PRECISION_TYPE maxY, PRECISION_TYPE maxZ):
min{minX, minY, minZ}, max{maxX, maxY, maxZ} {
@ -100,7 +97,9 @@ namespace Raytracing {
[[nodiscard]] PRECISION_TYPE avgDistanceFromCenter() const;
[[nodiscard]] inline bool isEmpty() const { return empty; }
// Returns true if the min and max are equal, which tells us this AABB wasn't assigned
// or was properly created. Either way it isn't responsible to use the AABB in said case.
[[nodiscard]] inline bool isEmpty() const { return min == max; }
[[nodiscard]] Vec4 getMin() const { return min; }

4
Step 3/include/engine/math/vectors.h
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@ -392,6 +392,10 @@ namespace Raytracing {
return out << "Vec4{" << v.x() << ", " << v.y() << ", " << v.z() << ", " << v.w() << "} ";
}
inline bool operator==(const Vec4& left, const Vec4& right) {
return left.x() == right.x() && left.y() == right.y() && left.z() == right.z() && left.w() == right.w();
}
class Ray {
private:
// the starting point for our ray

14
Step 3/include/engine/util/std.h
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@ -25,6 +25,8 @@
#include <algorithm>
#include <limits>
#include <random>
#include <cstdlib>
#include <memory>
/**
* defines
@ -52,6 +54,17 @@ static inline double degreeeToRadian(double deg){
}
namespace Raytracing {
class AlignedAllocator {
private:
public:
// not sure if this actually provides a performance benefit. Testing is inconclusive
template<typename T>
static T* allocateCacheAligned(int number = 1) {
void* allocatedSpace = aligned_alloc(64, sizeof(T) * number);
return new(allocatedSpace) T[number];
}
};
class Random {
private:
std::random_device rd; // obtain a random number from hardware
@ -64,6 +77,7 @@ namespace Raytracing {
return doubleDistr(gen);
}
};
class String {
public:
static inline std::string toLowerCase(const std::string& s) {

6
Step 3/include/engine/world.h
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@ -14,6 +14,7 @@
#include <utility>
namespace Raytracing {
class SphereObject : public Object {
@ -114,14 +115,15 @@ namespace Raytracing {
* saving on computation
*/
// TODO: the above todo has been done, now we need to test the performance advantage of the BVH
BVHTree* bvhTree = nullptr;
std::unique_ptr<BVHTree> bvhObjects;
std::unordered_map<std::string, Material*> materials;
public:
World() = default;
World(const World& world) = delete;
World(const World&& world) = delete;
// call this after you've added all the objects to the world. (Called by the raycaster class)
// Called by the raytracer class after all objects have been added to the world
// this allows us to generate a statically unchanging BVH for easy rendering
void generateBVH();
inline void add(Object* object) { objects.push_back(object); }

143
Step 3/include/graphics/gl/gl.h
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@ -12,6 +12,7 @@
#include <engine/image/image.h>
#include <config.h>
#include <graphics/gl/shader.h>
#ifndef USE_GLFW
#include <GLES3/gl32.h>
#include <GLES3/gl3.h>
@ -27,9 +28,151 @@
extern PFNGLVERTEXARRAYATTRIBBINDINGPROC glVertexArrayAttribBinding;
extern PFNGLVERTEXARRAYATTRIBFORMATPROC glVertexArrayAttribFormat;
#else
#include <graphics/gl/glad/gl.h>
#endif
class Shapes {
public:
struct cubeVertexBuilder {
std::vector<float> cubeVerticesRaw = {
-0.5f, -0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
0.5f, 0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, -0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
-0.5f, -0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, -0.5f,
};
std::vector<float> cubeUVs = {
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f
};
static cubeVertexBuilder getCubeExtends(float xRadius, float yRadius, float zRadius) {
cubeVertexBuilder builder {};
builder.cubeVerticesRaw = {
-0.5f, -0.5f, -zRadius,
0.5f, -0.5f, -zRadius,
0.5f, 0.5f, -zRadius,
0.5f, 0.5f, -zRadius,
-0.5f, 0.5f, -zRadius,
-0.5f, -0.5f, -zRadius,
-0.5f, -0.5f, zRadius,
0.5f, -0.5f, zRadius,
0.5f, 0.5f, zRadius,
0.5f, 0.5f, zRadius,
-0.5f, 0.5f, zRadius,
-0.5f, -0.5f, zRadius,
-xRadius, 0.5f, 0.5f,
-xRadius, 0.5f, -0.5f,
-xRadius, -0.5f, -0.5f,
-xRadius, -0.5f, -0.5f,
-xRadius, -0.5f, 0.5f,
-xRadius, 0.5f, 0.5f,
xRadius, 0.5f, 0.5f,
xRadius, 0.5f, -0.5f,
xRadius, -0.5f, -0.5f,
xRadius, -0.5f, -0.5f,
xRadius, -0.5f, 0.5f,
xRadius, 0.5f, 0.5f,
-0.5f, -yRadius, -0.5f,
0.5f, -yRadius, -0.5f,
0.5f, -yRadius, 0.5f,
0.5f, -yRadius, 0.5f,
-0.5f, -yRadius, 0.5f,
-0.5f, -yRadius, -0.5f,
-0.5f, yRadius, -0.5f,
0.5f, yRadius, -0.5f,
0.5f, yRadius, 0.5f,
0.5f, yRadius, 0.5f,
-0.5f, yRadius, 0.5f,
-0.5f, yRadius, -0.5f,
};
return builder;
}
};
};
// since we are doing everything with raytracing
// the purpose of these utility classes are purely for debug
// such as drawing bounding boxes around a BVH

4
Step 3/resources/shaders/world.fs
View File

@ -5,11 +5,15 @@ in vec2 outUv;
in vec3 outNormal;
uniform sampler2D tex;
uniform int useWhite;
const vec3 lightDir = vec3(1.0, 1.0, 1.0);
void main() {
vec4 textureColor = texture(tex, outUv);
//FragColor = vec4(textureColor.rgb, 1.0f);
if (useWhite == 0)
FragColor = vec4(vec3(1.0, 0.0f, 0.0f) * dot(lightDir, outNormal), 1.0f);
else
FragColor = vec4(1.0);
}

16
Step 3/src/engine/world.cpp
View File

@ -12,7 +12,7 @@ namespace Raytracing {
delete (p);
for (const auto& p: materials)
delete (p.second);
//delete(bvhTree);
//delete(bvhObjects);
}
HitData SphereObject::checkIfHit(const Ray& ray, PRECISION_TYPE min, PRECISION_TYPE max) const {
@ -58,25 +58,25 @@ namespace Raytracing {
std::pair<HitData, Object*> World::checkIfHit(const Ray& ray, PRECISION_TYPE min, PRECISION_TYPE max) const {
// actually speeds up rendering by about 110,000ms (total across 16 threads)
if (bvhTree != nullptr){
if (bvhObjects != nullptr){
auto hResult = HitData{false, Vec4(), Vec4(), max};
Object* objPtr = nullptr;
auto intersected = bvhTree->rayIntersect(ray, min, max);
auto intersected = bvhObjects->rayIntersect(ray, min, max);
//dlog << "Intersections " << intersected.size() << " " << ray << "\n";
for (auto* ptr : intersected) {
auto cResult = ptr->checkIfHit(ray, min, hResult.length);
for (const auto& ptr : intersected) {
auto cResult = ptr.ptr->checkIfHit(ray, min, hResult.length);
if (cResult.hit) {
hResult = cResult;
objPtr = ptr;
objPtr = ptr.ptr;
}
}
// after we check the BVH, we have to check for other missing objects
// since stuff like spheres currently don't have AABB and AABB isn't a requirement
// for the object class (to be assigned)
for (auto* obj: bvhTree->noAABBObjects) {
for (auto* obj: bvhObjects->noAABBObjects) {
// check up to the point of the last closest hit,
// will give the closest object's hit result
auto cResult = obj->checkIfHit(ray, min, hResult.length);
@ -105,7 +105,7 @@ namespace Raytracing {
}
void World::generateBVH() {
bvhTree = new BVHTree(objects);
bvhObjects = std::make_unique<BVHTree>(objects);
}
ScatterResults DiffuseMaterial::scatter(const Ray& ray, const HitData& hitData) const {

137
Step 3/src/graphics/graphics.cpp
View File

@ -14,143 +14,6 @@ extern bool* haltRaytracing;
namespace Raytracing {
struct cubeVertexBuilder {
std::vector<float> cubeVerticesRaw = {
-0.5f, -0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
0.5f, 0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, -0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
-0.5f, -0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, -0.5f,
};
static cubeVertexBuilder getCubeExtends(float xRadius, float yRadius, float zRadius) {
cubeVertexBuilder builder;
builder.cubeVerticesRaw = {
-0.5f, -0.5f, -zRadius,
0.5f, -0.5f, -zRadius,
0.5f, 0.5f, -zRadius,
0.5f, 0.5f, -zRadius,
-0.5f, 0.5f, -zRadius,
-0.5f, -0.5f, -zRadius,
-0.5f, -0.5f, zRadius,
0.5f, -0.5f, zRadius,
0.5f, 0.5f, zRadius,
0.5f, 0.5f, zRadius,
-0.5f, 0.5f, zRadius,
-0.5f, -0.5f, zRadius,
-xRadius, 0.5f, 0.5f,
-xRadius, 0.5f, -0.5f,
-xRadius, -0.5f, -0.5f,
-xRadius, -0.5f, -0.5f,
-xRadius, -0.5f, 0.5f,
-xRadius, 0.5f, 0.5f,
xRadius, 0.5f, 0.5f,
xRadius, 0.5f, -0.5f,
xRadius, -0.5f, -0.5f,
xRadius, -0.5f, -0.5f,
xRadius, -0.5f, 0.5f,
xRadius, 0.5f, 0.5f,
-0.5f, -yRadius, -0.5f,
0.5f, -yRadius, -0.5f,
0.5f, -yRadius, 0.5f,
0.5f, -yRadius, 0.5f,
-0.5f, -yRadius, 0.5f,
-0.5f, -yRadius, -0.5f,
-0.5f, yRadius, -0.5f,
0.5f, yRadius, -0.5f,
0.5f, yRadius, 0.5f,
0.5f, yRadius, 0.5f,
-0.5f, yRadius, 0.5f,
-0.5f, yRadius, -0.5f,
};
return builder;
}
};
std::vector<float> cubeUVs = {
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f
};
const std::vector<float> vertices = {
1.0f, 1.0f, 0.0f, // top right
1.0f, -1.0f, 0.0f, // bottom right