private static boolean raysEquivalent(Ray ray1, Ray ray2) {
Vector3d dir1 = new Vector3d(ray1.direction);
Vector3d dir2 = new Vector3d(ray2.direction);
dir1.normalize();
dir2.normalize();
dir1.sub(dir2);
return ray1.origin.dist(ray2.origin) < 1e-6 && dir1.len() < 1e-6;
}
public static void main(String args[]) {
Vector3d viewPoint = new Vector3d(1, 0.5, 2);
Vector3d viewDir = new Vector3d(15.23, -1.854, 65.221);
viewDir.normalize();
Vector3d viewUp = new Vector3d(1, 0, 0);
OrthographicCamera orthoCam = new OrthographicCamera();
orthoCam.setViewPoint(viewPoint);
orthoCam.setViewDir(viewDir);
orthoCam.setViewUp(viewUp);
PerspectiveCamera perspectiveCam = new PerspectiveCamera();
perspectiveCam.setViewPoint(viewPoint);
perspectiveCam.setViewDir(viewDir);
perspectiveCam.setViewUp(viewUp);
float u = 0.37123f;
float v = 0.11343f;
Ray correctRay0 =
new Ray(
new Vector3d(0.6235493799051484, 0.36878515466141304, 2.084176425089877),
new Vector3d(0.22730915261287413, -0.027671120744863338, 0.9734294315537928));
orthoCam.testGetRay(correctRay0, u, v);
Ray correctRay1 =
new Ray(
new Vector3d(1.0, 0.5, 2.0),
new Vector3d(-0.13811656557506483, -0.14714072701594028, 0.9794250460177998));
perspectiveCam.testGetRay(correctRay1, u, v);
u = 0.00234f;
v = 0.9832f;
Ray correctRay2 =
new Ray(
new Vector3d(1.4705511166404994, 0.005661926354425948, 1.8760675810709173),
new Vector3d(0.22730915261287413, -0.027671120744863338, 0.9734294315537928));
orthoCam.testGetRay(correctRay2, u, v);
Ray correctRay3 =
new Ray(
new Vector3d(1.0, 0.5, 2.0),
new Vector3d(0.5734153111840217, -0.4289226336993767, 0.698011644029039));
perspectiveCam.testGetRay(correctRay3, u, v);
u = 0.2345f;
v = 0.78201f;
Ray correctRay4 =
new Ray(
new Vector3d(1.2746277432055346, 0.2364287075632546, 1.928378256923414),
new Vector3d(0.22730915261287413, -0.027671120744863338, 0.9734294315537928));
orthoCam.testGetRay(correctRay4, u, v);
Ray correctRay5 =
new Ray(
new Vector3d(1.0, 0.5, 2.0),
new Vector3d(0.46805451959738786, -0.27158260116709737, 0.8409327306198586));
perspectiveCam.testGetRay(correctRay5, u, v);
u = 0.55523f;
v = 0.12555f;
Ray correctRay6 =
new Ray(
new Vector3d(0.635352111386452, 0.552789156075998, 2.0866509013806787),
new Vector3d(0.22730915261287413, -0.027671120744863338, 0.9734294315537928));
orthoCam.testGetRay(correctRay6, u, v);
Ray correctRay7 =
new Ray(
new Vector3d(1.0, 0.5, 2.0),
new Vector3d(-0.12844581009091482, 0.02349159814594461, 0.991438257627089));
perspectiveCam.testGetRay(correctRay7, u, v);
}
@Override
public void getColor(float u, float v, Color outColor) {
// TODO A4
// get our position if sphere is at 0, radius 1 (all that matters is ratios)
Vector3d pt = getPositionFromUV(u, v);
// create TBN inverse matrix
Vector3d normal = (new Vector3d(pt.x, pt.y, pt.z)).normalize();
Vector3d tangent;
if (u < .25 || (u > .5 && u < .75)) {
tangent = (new Vector3d(1 / pt.x, 0, -1 / pt.z)).normalize();
} else {
tangent = (new Vector3d(-1 / pt.x, 0, 1 / pt.z)).normalize();
}
Vector3d bitangent = (normal.clone().cross(tangent.clone())).normalize();
Matrix3d invTBN =
(new Matrix3d(
tangent.x,
bitangent.x,
normal.x,
tangent.y,
bitangent.y,
normal.y,
tangent.z,
bitangent.z,
normal.z))
.invert();
// ~-- The rest of this function calculates the new normal --~
Vector3d newNormal = new Vector3d();
// first determine distance to closest disk center
float divSize = (float) (1.0 / resolution);
// -calculate column
float modU = u % divSize;
float closestColumn = (u - modU) / divSize;
if (modU > divSize / 2) {
closestColumn++;
}
// -calculate row
float modV = v % divSize;
float closestRow = (v - modV) / divSize;
if (modV > divSize / 2) {
closestRow++;
}
// -calculate distance
float centerX = closestColumn * divSize;
float centerY = closestRow * divSize;
double distanceToCenter = Math.sqrt(Math.pow((centerX - u), 2) + Math.pow((centerY - v), 2));
// If we are on disk, use normal from disk center
// (the following formula ensures a bumpRadius of 0.5 is tangent circles, and >=1 is full
// overlap)
double diskRadius = (divSize / 2) * (Math.sqrt(2 * bumpRadius));
if (distanceToCenter <= diskRadius) {
Vector3d diskNormal = getPositionFromUV(centerX, centerY).normalize();
newNormal = multByMatrix(diskNormal, invTBN).normalize();
}
// if not on disk, use position normalized as normal
else {
newNormal = multByMatrix(normal, invTBN).normalize();
}
// Convert from [-1,1] to [0,1] to [0, 255]
Vector3d converted = new Vector3d();
converted.setMultiple(0.5, newNormal.clone().normalize());
converted.add(0.5);
Colord outColorAccurate = new Colord(converted);
outColor.set(outColorAccurate);
}
/**
* Tests this surface for intersection with ray. If an intersection is found record is filled out
* with the information about the intersection and the method returns true. It returns false
* otherwise and the information in outRecord is not modified.
*
* @param outRecord the output IntersectionRecord
* @param ray the ray to intersect
* @return true if the surface intersects the ray
*/
public boolean intersect(IntersectionRecord outRecord, Ray rayIn) {
// TODO#A2: fill in this function.
Vector3d p = rayIn.origin.clone().sub(center);
Vector3d d = rayIn.direction.clone();
double discr = Math.pow(d.dot(p), 2) - (d.dot(d)) * (p.dot(p) - Math.pow(radius, 2));
if (discr >= 0) {
double tPlus = (-d.dot(p) + Math.sqrt(discr)) / d.dot(d);
double tMinus = (-d.dot(p) - Math.sqrt(discr)) / d.dot(d);
double t = Math.min(tPlus, tMinus);
if (t > rayIn.end || t < rayIn.start) return false;
Vector3d intersect = new Vector3d();
rayIn.evaluate(intersect, t);
outRecord.location.set(intersect);
Vector3d normal = intersect.clone().sub(center).normalize();
outRecord.normal.set(normal);
outRecord.t = t;
outRecord.surface = this;
return true;
}
return false;
}