private bool updateCameraMatrix(int index, ParameterList pl)
{
string offset = index < 0 ? "" : string.Format("[{0}]", index);
if (index < 0)
{
index = 0;
}
Matrix4 transform = pl.getMatrix(string.Format("transform{0}", offset), null);
if (transform == null)
{
// no transform was specified, check eye/target/up
Point3 eye = pl.getPoint(string.Format("eye{0}", offset), null);
Point3 target = pl.getPoint(string.Format("target{0}", offset), null);
Vector3 up = pl.getVector(string.Format("up{0}", offset), null);
if (eye != null && target != null && up != null)
{
c2w[index] = Matrix4.fromBasis(OrthoNormalBasis.makeFromWV(Point3.sub(eye, target, new Vector3()), up));
c2w[index] = Matrix4.translation(eye.x, eye.y, eye.z).multiply(c2w[index]);
}
else
{
// the matrix for this index was not specified
// return an error, unless this is a regular update
return(offset.Length == 0);
}
}
else
{
c2w[index] = transform;
}
return(true);
}
public bool update(ParameterList pl, SunflowAPI api)
{
updateBasis(pl.getVector("center", null), pl.getVector("up", null));
numSamples = pl.getInt("samples", numSamples);
string filename = pl.getstring("texture", null);
if (filename != null)
texture = TextureCache.getTexture(api.resolveTextureFilename(filename), true);
// no texture provided
if (texture == null)
return false;
Bitmap b = texture.getBitmap();
if (b == null)
return false;
// rebuild histograms if this is a new texture
if (filename != null) {
imageHistogram = new float[b.Width][];
for(int i = 0;i < imageHistogram.Length;i++)
imageHistogram[i] = new float[b.Height];
colHistogram = new float[b.Width];
float du = 1.0f / b.Width;
float dv = 1.0f / b.Height;
for (int x = 0; x < b.Width; x++) {
for (int y = 0; y < b.Height; y++) {
float u = (x + 0.5f) * du;
float v = (y + 0.5f) * dv;
Color c = texture.getPixel(u, v);
// box filter the image
// c.add(texture.getPixel(u + du, v));
// c.add(texture.getPixel(u + du, v+ dv));
// c.add(texture.getPixel(u, v + dv));
// c.mul(0.25f);
imageHistogram[x][y] = c.getLuminance() * (float) Math.Sin(Math.PI * v);
if (y > 0)
imageHistogram[x][y] += imageHistogram[x][y - 1];
}
colHistogram[x] = imageHistogram[x][b.Height - 1];
if (x > 0)
colHistogram[x] += colHistogram[x - 1];
for (int y = 0; y < b.Height; y++)
imageHistogram[x][y] /= imageHistogram[x][b.Height - 1];
}
for (int x = 0; x < b.Width; x++)
colHistogram[x] /= colHistogram[b.Width - 1];
jacobian = (float) (2 * Math.PI * Math.PI) / (b.Width * b.Height);
}
// take fixed samples
if (pl.getbool("fixed", samples != null)) {
// Bitmap loc = new Bitmap(filename);
samples = new Vector3[numSamples];
colors = new Color[numSamples];
for (int i = 0; i < numSamples; i++) {
double randX = (double) i / (double) numSamples;
double randY = QMC.halton(0, i);
int x = 0;
while (randX >= colHistogram[x] && x < colHistogram.Length - 1)
x++;
float[] rowHistogram = imageHistogram[x];
int y = 0;
while (randY >= rowHistogram[y] && y < rowHistogram.Length - 1)
y++;
// sample from (x, y)
float u = (float) ((x == 0) ? (randX / colHistogram[0]) : ((randX - colHistogram[x - 1]) / (colHistogram[x] - colHistogram[x - 1])));
float v = (float) ((y == 0) ? (randY / rowHistogram[0]) : ((randY - rowHistogram[y - 1]) / (rowHistogram[y] - rowHistogram[y - 1])));
float px = ((x == 0) ? colHistogram[0] : (colHistogram[x] - colHistogram[x - 1]));
float py = ((y == 0) ? rowHistogram[0] : (rowHistogram[y] - rowHistogram[y - 1]));
float su = (x + u) / colHistogram.Length;
float sv = (y + v) / rowHistogram.Length;
float invP = (float) Math.Sin(sv * Math.PI) * jacobian / (numSamples * px * py);
samples[i] = getDirection(su, sv);
basis.transform(samples[i]);
colors[i] = texture.getPixel(su, sv).mul(invP);
// loc.setPixel(x, y, Color.YELLOW.copy().mul(1e6f));
}
// loc.save("samples.hdr");
} else {
// turn off
samples = null;
colors = null;
}
return true;
}
private bool updateCameraMatrix(int index, ParameterList pl)
{
string offset = index < 0 ? "" : string.Format("[{0}]", index);
if (index < 0)
index = 0;
Matrix4 transform = pl.getMatrix(string.Format("transform{0}", offset), null);
if (transform == null)
{
// no transform was specified, check eye/target/up
Point3 eye = pl.getPoint(string.Format("eye{0}", offset), null);
Point3 target = pl.getPoint(string.Format("target{0}", offset), null);
Vector3 up = pl.getVector(string.Format("up{0}", offset), null);
if (eye != null && target != null && up != null)
{
c2w[index] = Matrix4.fromBasis(OrthoNormalBasis.makeFromWV(Point3.sub(eye, target, new Vector3()), up));
c2w[index] = Matrix4.translation(eye.x, eye.y, eye.z).multiply(c2w[index]);
}
else
{
// the matrix for this index was not specified
// return an error, unless this is a regular update
return offset.Length == 0;
}
}
else
c2w[index] = transform;
return true;
}
public bool update(ParameterList pl, SunflowAPI api)
{
src = pl.getPoint("source", src);
dir = pl.getVector("dir", dir);
dir.normalize();
r = pl.getFloat("radius", r);
basis = OrthoNormalBasis.makeFromW(dir);
r2 = r * r;
radiance = pl.getColor("radiance", radiance);
return true;
}
public bool update(ParameterList pl, SunflowAPI api)
{
Vector3 up = pl.getVector("up", null);
Vector3 east = pl.getVector("east", null);
if (up != null && east != null)
basis = OrthoNormalBasis.makeFromWV(up, east);
else if (up != null)
basis = OrthoNormalBasis.makeFromW(up);
numSkySamples = pl.getInt("samples", numSkySamples);
sunDirWorld = pl.getVector("sundir", sunDirWorld);
turbidity = pl.getFloat("turbidity", turbidity);
// recompute model
initSunSky();
return true;
}
public bool Update(ParameterList pl, SunflowAPI api)
{
updateBasis(pl.getVector("center", null), pl.getVector("up", null));
numSamples = pl.getInt("samples", numSamples);
numLowSamples = pl.getInt("lowsamples", numLowSamples);
string filename = pl.getstring("texture", null);
if (filename != null)
texture = TextureCache.getTexture(api.resolveTextureFilename(filename), false);
// no texture provided
if (texture == null)
return false;
Bitmap b = texture.getBitmap();
if (b == null)
return false;
// rebuild histograms if this is a new texture
if (filename != null) {
imageHistogram = new float[b.getWidth()][];
for(int i = 0;i < imageHistogram.Length;i++)
imageHistogram[i] = new float[b.getHeight()];
colHistogram = new float[b.getWidth()];
float du = 1.0f / b.getWidth();
float dv = 1.0f / b.getHeight();
for (int x = 0; x < b.getWidth(); x++) {
for (int y = 0; y < b.getHeight(); y++) {
float u = (x + 0.5f) * du;
float v = (y + 0.5f) * dv;
Color c = texture.getPixel(u, v);
imageHistogram[x][y] = c.getLuminance() * (float) Math.Sin(Math.PI * v);
if (y > 0)
imageHistogram[x][y] += imageHistogram[x][y - 1];
}
colHistogram[x] = imageHistogram[x][b.getHeight() - 1];
if (x > 0)
colHistogram[x] += colHistogram[x - 1];
for (int y = 0; y < b.getHeight(); y++)
imageHistogram[x][y] /= imageHistogram[x][b.getHeight() - 1];
}
for (int x = 0; x < b.getWidth(); x++)
colHistogram[x] /= colHistogram[b.getWidth() - 1];
jacobian = (float) (2 * Math.PI * Math.PI) / (b.getWidth() * b.getHeight());
}
// take fixed samples
if (pl.getbool("fixed", samples != null)) {
// high density samples
samples = new Vector3[numSamples];
colors = new Color[numSamples];
generateFixedSamples(samples, colors);
// low density samples
lowSamples = new Vector3[numLowSamples];
lowColors = new Color[numLowSamples];
generateFixedSamples(lowSamples, lowColors);
} else {
// turn off
samples = lowSamples = null;
colors = lowColors = null;
}
return true;
}
