bool EquirectangularCamera::sampleDirection(PathSampleGenerator &sampler, const PositionSample &/*point*/, Vec2u pixel,
DirectionSample &sample) const
{
float pdf;
Vec2f uv = (Vec2f(pixel) + 0.5f + _filter.sample(sampler.next2D(), pdf))*_pixelSize;
float sinTheta;
sample.d = uvToDirection(uv, sinTheta);
sample.weight = Vec3f(1.0f);
sample.pdf = INV_PI*INV_TWO_PI/sinTheta;
return true;
}
bool CubemapCamera::sampleDirection(PathSampleGenerator &sampler, const PositionSample &/*point*/, Vec2u pixel,
DirectionSample &sample) const
{
Vec2f uv = (Vec2f(pixel) + 0.5f)*_pixelSize;
int face;
if (!uvToFace(uv, face))
return false;
float filterPdf;
uv += _filter.sample(sampler.next2D(CameraSample), filterPdf)*_pixelSize;
sample.d = uvToDirection(face, uv, sample.pdf);
sample.weight = Vec3f(1.0f);
return true;
}
