Vector2 Vector2::random(G3D::Random& r) {
Vector2 result;
do {
result = Vector2(r.uniform(-1, 1), r.uniform(-1, 1));
} while (result.squaredLength() >= 1.0f);
result.unitize();
return result;
}
void App::trace(int x, int y) {
Color3 sum = Color3::black();
if (m_currentRays == 1)
{
sum = rayTrace(m_debugCamera->worldRay(x + 0.5f, y + 0.5f, m_currentImage->rect2DBounds()), m_world);
}
// Don't calculate blur if either aperture or focal length are 0
else if(m_aperture == 0 || m_focalLength == 0)
{
for (int i = 0; i < m_currentRays; ++i)
{
sum += rayTrace(m_debugCamera->worldRay(x + rnd.uniform(), y + rnd.uniform(), m_currentImage->rect2DBounds()), m_world);
}
}
else
{
for (int i = 0; i < m_currentRays; ++i) {
// Save the original ray
Ray oldRay = m_debugCamera->worldRay(x, y, m_currentImage->rect2DBounds());
// Calculate the origin of the new ray by multiplying the x and y values by a fraction of the aperture (keep z the same)
Point3 newOrigin = Point3(oldRay.origin().x + (rnd.uniform() * m_aperture/20.0f), oldRay.origin().y + (rnd.uniform() * m_aperture/20.0f), oldRay.origin().z);
// Determine the direction between the end point of the original ray and the new origin
Vector3 newDirection = ((oldRay.origin() + oldRay.direction()* m_focalLength) - newOrigin);
// Normalize the direction of the new ray
newDirection /= newDirection.magnitude();
// Create a new ray from origin and direction, then add to sum
Ray newRay = Ray(newOrigin, newDirection);
sum += rayTrace(newRay, m_world);
}
}
m_currentImage->set(x, y, sum / (float)m_currentRays);
}