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#ifndef PHYSX_MESHGENERATOR_H
#define PHYSX_MESHGENERATOR_H

#include "PxPhysicsAPI.h"
#include "extensions/PxRemeshingExt.h"

namespace meshgenerator
{
using namespace physx;

void createCube(PxArray<PxVec3>& triVerts, PxArray<PxU32>& triIndices, const PxVec3& pos, PxReal scaling)
{
	triVerts.clear();
	triIndices.clear();
	triVerts.pushBack(scaling * PxVec3(0.5f, -0.5f, -0.5f) + pos);
	triVerts.pushBack(scaling * PxVec3(0.5f, -0.5f, 0.5f) + pos);
	triVerts.pushBack(scaling * PxVec3(-0.5f, -0.5f, 0.5f) + pos);
	triVerts.pushBack(scaling * PxVec3(-0.5f, -0.5f, -0.5f) + pos);
	triVerts.pushBack(scaling * PxVec3(0.5f, 0.5f, -0.5f) + pos);
	triVerts.pushBack(scaling * PxVec3(0.5f, 0.5f, 0.5f) + pos);
	triVerts.pushBack(scaling * PxVec3(-0.5f, 0.5f, 0.5f) + pos);
	triVerts.pushBack(scaling * PxVec3(-0.5f, 0.5f, -0.5f) + pos);

	triIndices.pushBack(1); triIndices.pushBack(2); triIndices.pushBack(3);
	triIndices.pushBack(7); triIndices.pushBack(6); triIndices.pushBack(5);
	triIndices.pushBack(4); triIndices.pushBack(5); triIndices.pushBack(1);
	triIndices.pushBack(5); triIndices.pushBack(6); triIndices.pushBack(2);

	triIndices.pushBack(2); triIndices.pushBack(6); triIndices.pushBack(7);
	triIndices.pushBack(0); triIndices.pushBack(3); triIndices.pushBack(7);
	triIndices.pushBack(0); triIndices.pushBack(1); triIndices.pushBack(3);
	triIndices.pushBack(4); triIndices.pushBack(7); triIndices.pushBack(5);

	triIndices.pushBack(0); triIndices.pushBack(4); triIndices.pushBack(1);
	triIndices.pushBack(1); triIndices.pushBack(5); triIndices.pushBack(2);
	triIndices.pushBack(3); triIndices.pushBack(2); triIndices.pushBack(7);
	triIndices.pushBack(4); triIndices.pushBack(0); triIndices.pushBack(7);
}

void createConeY(PxArray<PxVec3>& triVerts, PxArray<PxU32>& triIndices, const PxVec3& center, PxReal radius, PxReal height, PxU32 numPointsOnRing = 32)
{
	triVerts.clear();
	triIndices.clear();
	for (PxU32 i = 0; i < numPointsOnRing; ++i)
	{
		PxReal angle = i * 2.0f * 3.1415926535898f / numPointsOnRing;
		triVerts.pushBack(center + radius * PxVec3(PxSin(angle), 0, PxCos(angle)));
	}

	triVerts.pushBack(center);
	triVerts.pushBack(center + PxVec3(0, height, 0));
	for (PxU32 i = 0; i < numPointsOnRing; ++i)
	{
		triIndices.pushBack(numPointsOnRing);  triIndices.pushBack(i); triIndices.pushBack((i + 1) % numPointsOnRing);
		triIndices.pushBack(numPointsOnRing + 1); triIndices.pushBack((i + 1) % numPointsOnRing); triIndices.pushBack(i);
	}
}

void projectPointsOntoSphere(PxArray<PxVec3>& triVerts, const PxVec3& center, PxReal radius)
{
	for (PxU32 i = 0; i < triVerts.size(); ++i)
	{
		PxVec3 dir = triVerts[i] - center;
		dir.normalize();
		triVerts[i] = center + radius * dir;
	}
}

void projectPointsOntoBowl(PxArray<PxVec3>& triVerts, const PxVec3& center, PxReal radius)
{
	for (PxU32 i = 0; i < triVerts.size(); ++i)
	{
		PxVec3 dir = triVerts[i] - center;
		dir.normalize();

		if (dir.y > 0.01f) 
		{
			dir.x *= 0.9f;
			dir.z *= 0.9f;
			dir.y = -dir.y;
		}

		triVerts[i] = center + radius * dir;
	}
}

void createBowl(PxArray<PxVec3>& triVerts, PxArray<PxU32>& triIndices, const PxVec3& center, PxReal radius, const PxReal maxEdgeLength)
{
	triVerts.clear();
	triIndices.clear();
	createCube(triVerts, triIndices, center, radius);
	projectPointsOntoSphere(triVerts, center, radius);

	while (PxRemeshingExt::limitMaxEdgeLength(triIndices, triVerts, maxEdgeLength, 1))	
		projectPointsOntoSphere(triVerts, center, radius);		
	
	projectPointsOntoBowl(triVerts, center, radius);
}
}

#endif