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Copy pathVoxelPixelArea.cpp
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227 lines (207 loc) · 4.49 KB
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#include "VoxelPixelArea.h"
VoxelPixelArea::VoxelPixelArea()
{
}
float VoxelPixelArea::area(const Camera &c, const QVector3D ¢er,
float halfDim)
{
QPointF points[8];
float result = 0.0f;
int code = hullCode(c.position(), center, halfDim);
int num = m_hull[code][6];
// Project corners to image plane
for(int i = 0; i < num; i++)
{
points[i] = c.imageCoordinate(indexToVertex(m_hull[code][i], center,
halfDim));
}
for(int i = 0; i < num; ++i)
{
result += (points[i].x() + points[(i + 1) % num].x())
* (points[i].y() - points[(i + 1) % num].y());
}
return qAbs(result * 0.5f);
}
float VoxelPixelArea::area(const Camera &c, const Cube &cube)
{
return area(c, cube.center(), cube.halfExtent());
}
float VoxelPixelArea::approximateArea(const Camera &c, const QVector3D ¢er,
float halfDim)
{
QPointF points[8];
int code = hullCode(c.position(), center, halfDim);
int num = m_hull[code][6];
points[0] = c.imageCoordinate(indexToVertex(m_hull[code][0], center,
halfDim));
float minX, maxX, minY, maxY;
minX = maxX = points[0].x();
minY = maxY = points[0].y();
// Project corners to image plane
for(int i = 1; i < num; i++)
{
points[i] = c.imageCoordinate(indexToVertex(m_hull[code][i], center,
halfDim));
if(points[i].x() > maxX) maxX = points[i].x();
if(points[i].x() < minX) minX = points[i].x();
if(points[i].y() > maxY) maxY = points[i].y();
if(points[i].y() < minY) minY = points[i].y();
}
return (maxX - minX) * (maxY - minY);
}
// Maps cube corner index to x,y,z
QVector3D VoxelPixelArea::indexToVertex(int index, const QVector3D ¢er,
float halfDim)
{
QVector3D vertex = center;
vertex[0] += halfDim * (index & 4 ? 1 : -1);
vertex[1] += halfDim * (index & 2 ? 1 : -1);
vertex[2] += halfDim * (index & 1 ? 1 : -1);
return vertex;
}
int VoxelPixelArea::hullCode(const QVector3D &eye, const QVector3D ¢er,
float halfDim)
{
QVector3D min = center - QVector3D(halfDim, halfDim, halfDim);
QVector3D max = center + QVector3D(halfDim, halfDim, halfDim);
return (eye.x() < min.x() ? 1 : 0)
+ (eye.x() > max.x() ? 2 : 0)
+ (eye.y() < min.y() ? 4 : 0)
+ (eye.y() > max.y() ? 8 : 0)
+ (eye.z() < min.z() ? 16 : 0)
+ (eye.z() > max.z() ? 32 : 0);
}
int const VoxelPixelArea::m_hull[64][8] =
{
{},
{ 0, 1, 3, 2, 0, 0, 4 },
{ 5, 4, 6, 7, 0, 0, 4 },
{},
{ 1, 0, 4, 5, 0, 0, 4 },
{ 4, 5, 1, 3, 2, 0, 6 },
{ 1, 0, 4, 6, 7, 5, 6 },
{},
{ 2, 3, 7, 6, 0, 0, 4 },
{ 0, 1, 3, 7, 6, 2, 6 },
{ 5, 4, 6, 2, 3, 7, 6 },
{},
{},
{},
{},
{},
{ 4, 0, 2, 6, 0, 0, 4 },
{ 4, 0, 1, 3, 2, 6, 6 },
{ 5, 4, 0, 2, 6, 7, 6 },
{},
{ 5, 1, 0, 2, 6, 4, 6 },
{ 4, 5, 1, 3, 2, 6, 6 },
{ 5, 1, 0, 2, 6, 7, 6 },
{},
{ 4, 0, 2, 3, 7, 6, 6 },
{ 4, 0, 1, 3, 7, 6, 6 },
{ 5, 4, 0, 2, 3, 7, 6 },
{},
{},
{},
{},
{},
{ 1, 5, 7, 3, 0, 0, 4 },
{ 0, 1, 5, 7, 3, 2, 6 },
{ 1, 5, 4, 6, 7, 3, 6 },
{},
{ 0, 4, 5, 7, 3, 1, 6 },
{ 0, 4, 5, 7, 3, 2, 6 },
{ 1, 0, 4, 6, 7, 3, 6 },
{},
{ 1, 5, 7, 6, 2, 3, 6 },
{ 0, 1, 5, 7, 6, 2, 6 },
{ 1, 5, 4, 6, 2, 3, 6 },
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{},
{}
};
//int const VoxelPixelArea::m_hull[64][8] =
//{
// {},
// { 4, 0, 1, 3, 2 },
// { 4, 5, 4, 6, 7 },
// {},
// { 4, 1, 0, 4, 5 },
// { 6, 4, 5, 1, 3, 2, 0 },
// { 6, 1, 0, 4, 6, 7, 5 },
// {},
// { 4, 2, 3, 7, 6 },
// { 6, 0, 1, 3, 7, 6, 2 },
// { 6, 5, 4, 6, 2, 3, 7 },
// {},
// {},
// {},
// {},
// {},
// { 4, 4, 0, 2, 6 },
// { 6, 4, 0, 1, 3, 2, 6 },
// { 6, 5, 4, 0, 2, 6, 7 },
// {},
// { 6, 5, 1, 0, 2, 6, 4 },
// { 6, 4, 5, 1, 3, 2, 6 },
// { 6, 5, 1, 0, 2, 6, 7 },
// {},
// { 6, 4, 0, 2, 3, 7, 6 },
// { 6, 4, 0, 1, 3, 7, 6 },
// { 6, 5, 4, 0, 2, 3, 7 },
// {},
// {},
// {},
// {},
// {},
// { 4, 1, 5, 7, 3 },
// { 6, 0, 1, 5, 7, 3, 2 },
// { 6, 1, 5, 4, 6, 7, 3 },
// {},
// { 6, 0, 4, 5, 7, 3, 1 },
// { 6, 0, 4, 5, 7, 3, 2 },
// { 6, 1, 0, 4, 6, 7, 3 },
// {},
// { 6, 1, 5, 7, 6, 2, 3 },
// { 6, 0, 1, 5, 7, 6, 2 },
// { 6, 1, 5, 4, 6, 2, 3 },
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {},
// {}
//};