polyvox/examples/SmoothLOD/main.cpp

/*******************************************************************************
The MIT License (MIT)

Copyright (c) 2015 David Williams and Matthew Williams

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#include "PolyVoxExample.h"

#include "PolyVox/Density.h"
#include "PolyVox/MarchingCubesSurfaceExtractor.h"
#include "PolyVox/Mesh.h"
#include "PolyVox/RawVolume.h"
#include "PolyVox/VolumeResampler.h"

#include <QApplication>

//Use the PolyVox namespace
using namespace PolyVox;

void createSphereInVolume(RawVolume<uint8_t>& volData, float fRadius)
{
	//This vector hold the position of the center of the volume
	Vector3DFloat v3dVolCenter(volData.getWidth() / 2, volData.getHeight() / 2, volData.getDepth() / 2);

	//This three-level for loop iterates over every voxel in the volume
	for (int z = 0; z < volData.getDepth(); z++)
	{
		for (int y = 0; y < volData.getHeight(); y++)
		{
			for (int x = 0; x < volData.getWidth(); x++)
			{
				//Store our current position as a vector...
				Vector3DFloat v3dCurrentPos(x, y, z);
				//And compute how far the current position is from the center of the volume
				float fDistToCenter = (v3dCurrentPos - v3dVolCenter).length();

				if (fDistToCenter <= fRadius)
				{
					//Our new density value
					uint8_t uDensity = std::numeric_limits<uint8_t>::max();

					//Wrte the voxel value into the volume	
					volData.setVoxel(x, y, z, uDensity);
				}

				//144 in the middle, (144 - 32) at the edges. Threshold of 128 is between these
				//volData.setVoxel(x, y, z, 144 - fDistToCenter);
			}
		}
	}
}

class SmoothLODExample : public PolyVoxExample
{
public:
	SmoothLODExample(QWidget *parent)
		:PolyVoxExample(parent)
	{
	}

protected:
	void initializeExample() override
	{
		//Create an empty volume and then place a sphere in it
		RawVolume<uint8_t> volData(PolyVox::Region(Vector3DInt32(0, 0, 0), Vector3DInt32(63, 63, 63)));
		createSphereInVolume(volData, 28);

		//Smooth the data - should reimplement this using LowPassFilter
		//smoothRegion<PagedVolume, Density8>(volData, volData.getEnclosingRegion());
		//smoothRegion<PagedVolume, Density8>(volData, volData.getEnclosingRegion());
		//smoothRegion<PagedVolume, Density8>(volData, volData.getEnclosingRegion());

		RawVolume<uint8_t> volDataLowLOD(PolyVox::Region(Vector3DInt32(0, 0, 0), Vector3DInt32(15, 31, 31)));

		VolumeResampler< RawVolume<uint8_t>, RawVolume<uint8_t> > volumeResampler(&volData, PolyVox::Region(Vector3DInt32(0, 0, 0), Vector3DInt32(31, 63, 63)), &volDataLowLOD, volDataLowLOD.getEnclosingRegion());
		volumeResampler.execute();

		//Extract the surface
		auto meshLowLOD = extractMarchingCubesMesh(&volDataLowLOD, volDataLowLOD.getEnclosingRegion());
		// The returned mesh needs to be decoded to be appropriate for GPU rendering.
		auto decodedMeshLowLOD = decodeMesh(meshLowLOD);

		//Extract the surface
		auto meshHighLOD = extractMarchingCubesMesh(&volData, PolyVox::Region(Vector3DInt32(30, 0, 0), Vector3DInt32(63, 63, 63)));
		// The returned mesh needs to be decoded to be appropriate for GPU rendering.
		auto decodedMeshHighLOD = decodeMesh(meshHighLOD);

		//Pass the surface to the OpenGL window
		addMesh(decodedMeshHighLOD, Vector3DInt32(30, 0, 0));
		addMesh(decodedMeshLowLOD, Vector3DInt32(0, 0, 0), 63.0f / 31.0f);

		setCameraTransform(QVector3D(100.0f, 100.0f, 100.0f), -(PI / 4.0f), PI + (PI / 4.0f));
	}
};

int main(int argc, char *argv[])
{
	//Create and show the Qt OpenGL window
	QApplication app(argc, argv);
	SmoothLODExample openGLWidget(0);
	openGLWidget.show();

	//Run the message pump.
	return app.exec();
}