public void NextFloat10M()
{
for (int i = 0; i < __loops; i++)
{
_rng.NextFloat();
}
}
public Color[] NextFrame()
{
Parallel.For(0, renderConfig.Height, y =>
{
Parallel.For(0, renderConfig.Width, x =>
{
// chapter 1 outputs the image to the image file, we're flipping the
// row pointer so that we start from the other end in order to get same visual result.
var index = (renderConfig.Height - 1 - y) * renderConfig.Width + x;
if (renderConfig.Antialiasing)
{
Vector3 color = new Vector3();
for (int i = 0; i < renderConfig.AASamples; i++)
{
float u = (x + XorShiftRandom.NextFloat()) / renderConfig.Width;
float v = (y + XorShiftRandom.NextFloat()) / renderConfig.Height;
color += PixelColor(camera.GetRay(u, v), World, 0);
}
color /= renderConfig.AASamples;
color = new Vector3(MathUtil.FastSqrt(color.X), MathUtil.FastSqrt(color.Y), MathUtil.FastSqrt(color.Z));
color *= 255.99f;
frameBuffer[index].R = (byte)color.X;
frameBuffer[index].G = (byte)color.Y;
frameBuffer[index].B = (byte)color.Z;
frameBuffer[index].A = 255;
}
else
{
float u = (float)x / renderConfig.Width;
float v = (float)y / renderConfig.Height;
var color = PixelColor(camera.GetRay(u, v), World, 0);
color = new Vector3(MathUtil.FastSqrt(color.X), MathUtil.FastSqrt(color.Y), MathUtil.FastSqrt(color.Z));
color *= 255.99f;
frameBuffer[index].R = (byte)color.X;
frameBuffer[index].G = (byte)color.Y;
frameBuffer[index].B = (byte)color.Z;
frameBuffer[index].A = 255;
}
});
});
return(frameBuffer);
}
public void NextFloat()
{
int sampleCount = 10000000;
XorShiftRandom rng = new XorShiftRandom();
double[] sampleArr = new double[sampleCount];
for (int i = 0; i < sampleCount; i++)
{
sampleArr[i] = rng.NextFloat();
}
UniformDistributionTest(sampleArr, 0.0, 1.0);
}
private List <Hitable> RandomScene()
{
var result = new List <Hitable>();
result.Add(new Sphere(new Vector3(0f, -1000f, 0f), 1000f, new Lambertian(new Vector3(0.5f, 0.5f, 0.5f))));
result.Add(new Sphere(new Vector3(0f, 1f, 0f), 1f, new Dielectric(1.5f)));
result.Add(new Sphere(new Vector3(-4f, 1f, 0f), 1f, new Lambertian(new Vector3(0.4f, 0.2f, 0.1f))));
result.Add(new Sphere(new Vector3(4f, 1f, 0f), 1f, new Metal(new Vector3(0.7f, 0.6f, 0.5f), 0.0f)));
for (int a = -11; a < 11; a++)
{
for (int b = -11; b < 11; b++)
{
float material = XorShiftRandom.NextFloat();
Vector3 center = new Vector3(a + 0.9f * XorShiftRandom.NextFloat(), 0.2f, b + 0.9f * XorShiftRandom.NextFloat());
if ((center - new Vector3(4f, 0f, 0.2f)).Length() > 0.9f)
{
if (material < 0.8f)
{
result.Add(new Sphere(center, 0.2f, new Lambertian(new Vector3(XorShiftRandom.NextFloat() * XorShiftRandom.NextFloat(), XorShiftRandom.NextFloat() * XorShiftRandom.NextFloat(), XorShiftRandom.NextFloat() * XorShiftRandom.NextFloat()))));
}
else if (material < 0.95f)
{
result.Add(new Sphere(center, 0.2f, new Metal(new Vector3(0.5f * (1 + XorShiftRandom.NextFloat()), 0.5f * (1 + XorShiftRandom.NextFloat()), 0.5f * (1 + XorShiftRandom.NextFloat())), 0.5f * XorShiftRandom.NextFloat())));
}
else
{
result.Add(new Sphere(center, 0.2f, new Dielectric(1.5f)));
}
}
}
}
return(result);
}
/// <summary>
/// Add objects to the Box2d world.
/// </summary>
protected override void PopulateWorld()
{
// ==== Define the ground body ====
BodyDef groundBodyDef = new BodyDef();
groundBodyDef.Position.Set(_trackLengthHalf, -1f);
// Call the body factory which creates the ground box shape.
// The body is also added to the world.
Body groundBody = _world.CreateBody(groundBodyDef);
// Define the ground box shape.
PolygonDef groundShapeDef = new PolygonDef();
// The extents are the half-widths of the box.
groundShapeDef.SetAsBox(_trackLengthHalf + 1f, 1f);
groundShapeDef.Friction = _simParams._defaultFriction;
groundShapeDef.Restitution = _simParams._defaultRestitution;
groundShapeDef.Filter.CategoryBits = 0x3;
// Add the ground shape to the ground body.
groundBody.CreateShape(groundShapeDef);
// Add some small mounds/bumps to the ground.
for (float x = -1f; x < 40f; x += 0.4f + ((_rng.NextFloat() - 0.5f) * 0.15f))
{
WalkerWorldUtils.CreateMound(_world, x, 0f, _simParams._defaultFriction, _simParams._defaultRestitution);
}
// ==== Define walker torso.
float walkerX = 0f;
float walkerY = 1.30f;// + ((float)_rng.NextDouble() * 0.1f);
BodyDef torsoBodyDef = new BodyDef();
torsoBodyDef.Position.Set(walkerX, walkerY);
torsoBodyDef.IsBullet = true;
// Create walker torso.
_torsoBody = _world.CreateBody(torsoBodyDef);
PolygonDef torsoShapeDef = new PolygonDef();
torsoShapeDef.SetAsBox(0.10f, 0.30f);
torsoShapeDef.Friction = _simParams._defaultFriction;
torsoShapeDef.Restitution = 0f;
torsoShapeDef.Density = 2f;
torsoShapeDef.Filter.CategoryBits = 0x2;
_torsoBody.CreateShape(torsoShapeDef);
_torsoBody.SetMassFromShapes();
// ===== Create legs.
// Leg joint definition.
RevoluteJointDef jointDef = new RevoluteJointDef();
jointDef.CollideConnected = false;
jointDef.EnableMotor = true;
jointDef.MaxMotorTorque = 0f;
// Other re-usable stuff .
const float legRadius = 0.05f; // Half the thickness of the leg
Vec2 upperLegPosBase = new Vec2(walkerX, walkerY - 0.25f);
Vec2 lowerLegPosBase = new Vec2(walkerX, walkerY - 0.75f);
// ===== Create left leg.
// Upper leg.
Body upperLeftLegBody = CreatePole(upperLegPosBase, 0.5f, (float)SysMath.PI, legRadius, 2f, 0x1);
// Join to torso (hip joint)
jointDef.Initialize(_torsoBody, upperLeftLegBody, upperLegPosBase);
_leftHipJoint = (RevoluteJoint)_world.CreateJoint(jointDef);
// Lower leg.
_leftLowerLegBody = CreatePole(lowerLegPosBase, __lowerLegLength, (float)SysMath.PI, legRadius, 2f, 0x1);
// Join to upper leg (knee joint)
jointDef.Initialize(upperLeftLegBody, _leftLowerLegBody, lowerLegPosBase);
_leftKneeJoint = (RevoluteJoint)_world.CreateJoint(jointDef);
// ===== Create right leg.
// Upper leg.
Body upperRightLegBody = CreatePole(upperLegPosBase, 0.5f, (float)SysMath.PI, legRadius, 2f, 0x1);
// Join to torso (hip joint)
jointDef.Initialize(_torsoBody, upperRightLegBody, upperLegPosBase);
_rightHipJoint = (RevoluteJoint)_world.CreateJoint(jointDef);
// Lower leg.
_rightLowerLegBody = CreatePole(lowerLegPosBase, __lowerLegLength, (float)SysMath.PI, legRadius, 2f, 0x1);
// Join to upper leg (knee joint)
jointDef.Initialize(upperRightLegBody, _rightLowerLegBody, lowerLegPosBase);
_rightKneeJoint = (RevoluteJoint)_world.CreateJoint(jointDef);
}