public MeshViewer(String title, ArrayList<Triangle> triangles, boolean culling) {
super(title);
enableCullling = culling;
this.setSize(640, 480);
ArrayList<PointND> edgePoints = new ArrayList<PointND>();
for (Triangle t : triangles) {
edgePoints.add(t.getA());
edgePoints.add(t.getB());
edgePoints.add(t.getC());
}
PointND center = DoublePrecisionPointUtil.getGeometricCenter(edgePoints);
Translation translation = new Translation(center.getAbstractVector().negated());
double max = 0;
for (PointND p : edgePoints) {
p.applyTransform(translation);
for (int i = 0; i < 3; i++) {
if (Math.abs(p.get(i)) > max) {
max = Math.abs(p.get(i));
}
}
}
AffineTransform affineTransform =
new AffineTransform(SimpleMatrix.I_3.dividedBy(max / 1.0), new SimpleVector(0, 0, 0));
for (Triangle t : triangles) {
t.applyTransform(translation);
t.applyTransform(affineTransform);
}
this.triangles = triangles;
}
public Grid2D raytraceScene(PrioritizableScene phantomScene, Projection projection) {
Trajectory geom = Configuration.getGlobalConfiguration().getGeometry();
// Grid2D slice = new Grid2D(geom.getDetectorWidth(), geom.getDetectorHeight());
Grid2D slice =
detector.createDetectorGrid(geom.getDetectorWidth(), geom.getDetectorHeight(), projection);
rayTracer.setScene(phantomScene);
// Second rule of optimization is: Optimize later.
PointND raySource = new PointND(0, 0, 0);
raySource.setCoordinates(projection.computeCameraCenter());
StraightLine castLine = new StraightLine(raySource, new SimpleVector(0, 0, 0));
SimpleVector centerPixDir = null;
if (accurate) {
centerPixDir = projection.computePrincipalAxis();
}
// SimpleVector prinpoint = trajectory.getProjectionMatrix(sliceNumber).getPrincipalPoint();
double xcorr = 0; // trajectory.getDetectorWidth()/2 - prinpoint.getElement(0);
double ycorr = 0; // trajectory.getDetectorHeight()/2 - prinpoint.getElement(1);
double length = trajectory.getSourceToDetectorDistance();
Edge environmentEdge = new Edge(new PointND(0), new PointND(length));
ArrayList<PhysicalObject> fallBackBackground = new ArrayList<PhysicalObject>(1);
SimpleVector pixel = new SimpleVector(0, 0);
boolean negate = false;
for (int y = 0; y < trajectory.getDetectorHeight(); y++) {
for (int x = 0; x < trajectory.getDetectorWidth(); x++) {
pixel.setElementValue(0, x - xcorr);
pixel.setElementValue(1, y - ycorr);
SimpleVector dir = projection.computeRayDirection(pixel);
if ((y == 0) && (x == 0)) {
// Check that ray direction is towards origin.
double max = 0;
int index = 0;
for (int i = 0; i < 3; i++) {
if (Math.abs(dir.getElement(i)) > max) {
max = Math.abs(dir.getElement(i));
index = i;
}
}
double t = -raySource.get(index) / dir.getElement(index);
if (t < 0) negate = true;
}
if (negate) dir.negate();
castLine.setDirection(dir);
ArrayList<PhysicalObject> segments = rayTracer.castRay(castLine);
if (accurate) {
double dirCosine = SimpleOperators.multiplyInnerProd(centerPixDir, dir);
length = trajectory.getSourceToDetectorDistance() / dirCosine;
}
if (segments == null) {
fallBackBackground.clear();
segments = fallBackBackground;
} else {
if (accurate) {
environmentEdge =
new Edge(new PointND(0), new PointND(length - getTotalSegmentsLength(segments)));
}
}
environment.setShape(environmentEdge);
segments.add(environment);
/* old code:
double integral = absorptionModel.evaluateLineIntegral(segments);
slice.putPixelValue(x, y, integral);
*/
detector.writeToDetector(slice, x, y, segments);
}
}
return slice;
}
public Grid2D createSinogramm(Grid2D phantom, boolean filter) {
// Bouding Box
Box imageBox =
new Box(
phantom.getWidth() * phantom.getSpacing()[0],
phantom.getHeight() * phantom.getSpacing()[1],
2.0d);
imageBox.setLowerCorner(new PointND(phantom.getOrigin()[0], phantom.getOrigin()[1], -1.0));
imageBox.setUpperCorner(new PointND(-phantom.getOrigin()[0], -phantom.getOrigin()[1], 1.0));
// walk over each projection
for (int indexProjections = 0; indexProjections < projections; indexProjections++) {
// walk along the detector
for (int indexDetektor = 0; indexDetektor < numberPixel; indexDetektor++) {
// define the parallel lines of the detector
double[] indexWorld = this.indexToPhysical(indexDetektor, indexProjections);
double angle = angleWidthR * indexProjections;
double s = indexWorld[0];
double cos = Math.cos(angle);
double sin = Math.sin(angle);
PointND p1 = new PointND(cos * s, sin * s, 0.0d);
PointND p2 = new PointND(cos * s - sin, sin * s + cos, 0.0d);
StraightLine line = new StraightLine(p1, p2);
// intersection of the box and the line
ArrayList<PointND> crossingPoints = imageBox.intersect(line);
// if there is no intersection -> change direction of the line and look again
if (crossingPoints.size() == 0) {
p2 = new PointND(cos * s + sin, sin * s - cos, 0.0d);
line = new StraightLine(p1, p2);
crossingPoints = imageBox.intersect(line);
}
if (crossingPoints.size() == 2) {
PointND c1 = crossingPoints.get(0);
PointND c2 = crossingPoints.get(1);
// compute distance between intersectoin points
double distance = c1.euclideanDistance(c2);
// define the direction of the line
double deltax = (c2.get(0) - c1.get(0)) / (distance);
double deltay = (c2.get(1) - c1.get(1)) / (distance);
double deltaz = (c2.get(2) - c1.get(2)) / (distance);
PointND richtung = new PointND(deltax, deltay, deltaz);
// result value at the current position in the sinogramm
float val = 0.f;
// stepsize of the integral
double delta = 0.5; // in mm
// line integral
for (double k = 0; k < (distance); k = k + delta) {
double indexX = c1.get(0) + k * (richtung.get(0));
double indexY = c1.get(1) + k * (richtung.get(1));
double[] indexImage = phantom.physicalToIndex(indexX, indexY);
val += InterpolationOperators.interpolateLinear(phantom, indexImage[0], indexImage[1]);
}
this.setAtIndex(indexDetektor, indexProjections, (float) (val * delta));
}
}
}
if (filter == true) {
filtering(this);
}
Grid2D result = new Grid2D(this);
return result;
}