public void TestPathTracer()
{
PCG pcg = new PCG();
for (int i = 0; i < 5; i++)
{
World world = new World();
float emittedRadiance = pcg.randomFloat();
float reflectance = pcg.randomFloat();
Material enclosureMaterial = new Material(
Brdf: new DiffuseBRDF(pig: new UniformPigment(new Color(1f, 1f, 1f) * reflectance)),
EmittedRadiance: new UniformPigment(new Color(1f, 1f, 1f) * emittedRadiance)
);
world.addShape(new Sphere(material: enclosureMaterial));
PathTracer pathTracer = new PathTracer(
world: world,
pcg: pcg,
numOfRays: 1,
maxDepth: 100,
russianRouletteLimit: 101
);
Ray ray = new Ray(origin: new Point(0f, 0f, 0f), dir: new Vec(1f, 0f, 0f));
Color color = pathTracer.computeRadiance(ray);
float expected = emittedRadiance / (1.0f - reflectance);
Assert.True(Utility.areClose(expected, color.r, 1e-3f), $"TestPathTracer failed - Assert i={i}, 1/3");
Assert.True(Utility.areClose(expected, color.g, 1e-3f), $"TestPathTracer failed - Assert i={i}, 2/3");
Assert.True(Utility.areClose(expected, color.b, 1e-3f), $"TestPathTracer failed - Assert i={i}, 3/3");
}
}
public void ONBRandomTestingVec()
{
PCG pcg = new PCG();
for (int i = 0; i < 1E5; i++) {
Vec n = new Vec(pcg.randomFloat(), pcg.randomFloat(), pcg.randomFloat()).Normalize();
List<Vec> onb = n.createONBfromZ();
Assert.True(onb[2].isClose(n), "ONBRandomTesting Failed! Assert 1");
Assert.True(Utility.areClose(onb[0] * onb[1], 0f), $"{onb[0] * onb[1]} is not close to {0f}!!");
Assert.True(Utility.areClose(onb[1] * onb[2], 0f), $"{onb[1] * onb[2]} is not close to {0f}!!");
Assert.True(Utility.areClose(onb[0] * onb[2], 0f), $"{onb[0] * onb[2]} is not close to {0f}!!");
Assert.True(Utility.areClose(onb[0].getSquaredNorm(),1f), "ONBRandomTesting Failed! Assert 5");
Assert.True(Utility.areClose(onb[1].getSquaredNorm(),1f), "ONBRandomTesting Failed! Assert 6");
Assert.True(Utility.areClose(onb[2].getSquaredNorm(),1f), "ONBRandomTesting Failed! Assert 7");
}
}