public static Camera Create(ParamSet paramSet, AnimatedTransform cam2World, Film film, Medium medium)
{
// Extract common camera parameters from _ParamSet_
double shutteropen = paramSet.FindOneFloat("shutteropen", 0.0);
double shutterclose = paramSet.FindOneFloat("shutterclose", 1.0);
if (shutterclose < shutteropen)
{
//Warning("Shutter close time [%f] < shutter open [%f]. Swapping them.",
// shutterclose, shutteropen);
PbrtMath.Swap(ref shutterclose, ref shutteropen);
}
double lensradius = paramSet.FindOneFloat("lensradius", 0.0);
double focaldistance = paramSet.FindOneFloat("focaldistance", 1e6);
double frame = paramSet.FindOneFloat(
"frameaspectratio",
Convert.ToDouble(film.FullResolution.X) / Convert.ToDouble(film.FullResolution.Y));
Bounds2D screen;
if (frame > 1.0)
{
screen = new Bounds2D(new Point2D(-frame, -1.0), new Point2D(frame, 1.0));
}
else
{
screen = new Bounds2D(new Point2D(-1.0, -1.0 / frame), new Point2D(1.0, 1.0 / frame));
}
double[] sw = paramSet.FindFloat("screenwindow");
if (sw != null)
{
if (sw.Length == 4)
{
screen = new Bounds2D(new Point2D(sw[0], sw[2]), new Point2D(sw[1], sw[3]));
}
else
{
//Error("\"screenwindow\" should have four values");
}
}
double fov = paramSet.FindOneFloat("fov", 90.0);
double halffov = paramSet.FindOneFloat("halffov", -1.0);
if (halffov > 0.0)
{
// hack for structure synth, which exports half of the full fov
fov = 2.0 * halffov;
}
return(new PerspectiveCamera(cam2World, screen, shutteropen, shutterclose,
lensradius, focaldistance, fov, film, medium));
}
public Matrix4x4 Inverse()
{
int[] indxc = new int[4];
int[] indxr = new int[4];
int[] ipiv =
{
0,
0,
0,
0
};
double[,] minv = new double[4, 4];
Array.Copy(_m, minv, 4 * 4);
for (int i = 0; i < 4; i++)
{
int irow = 0;
int icol = 0;
double big = 0.0;
// Choose pivot
for (int j = 0; j < 4; j++)
{
if (ipiv[j] != 1)
{
for (int k = 0; k < 4; k++)
{
if (ipiv[k] == 0)
{
if (Math.Abs(minv[j, k]) >= big)
{
big = Math.Abs(minv[j, k]);
irow = j;
icol = k;
}
}
else if (ipiv[k] > 1.0)
{
throw new InvalidOperationException("Singular matrix in MatrixInvert");
}
}
}
}
++ipiv[icol];
// Swap rows _irow_ and _icol_ for pivot
if (irow != icol)
{
for (int k = 0; k < 4; ++k)
{
PbrtMath.Swap(ref minv[irow, k], ref minv[icol, k]);
}
}
indxr[i] = irow;
indxc[i] = icol;
if (minv[icol, icol] == 0.0)
{
throw new InvalidOperationException("Singular matrix in MatrixInvert");
}
// Set $m[icol,icol]$ to one by scaling row _icol_ appropriately
double pivinv = 1.0 / minv[icol, icol];
minv[icol, icol] = 1.0;
for (int j = 0; j < 4; j++)
{
minv[icol, j] *= pivinv;
}
// Subtract this row from others to zero out their columns
for (int j = 0; j < 4; j++)
{
if (j != icol)
{
double save = minv[j, icol];
minv[j, icol] = 0;
for (int k = 0; k < 4; k++)
{
minv[j, k] -= minv[icol, k] * save;
}
}
}
}
// Swap columns to reflect permutation
for (int j = 3; j >= 0; j--)
{
if (indxr[j] != indxc[j])
{
for (int k = 0; k < 4; k++)
{
PbrtMath.Swap(ref minv[k, indxr[j]], ref minv[k, indxc[j]]);
}
}
}
return(new Matrix4x4(minv));
}
