Sample ray multiple times

[luca-morreale]

Is there any way to cast multiple rays from a camera/sensor in 1 function call? Or at least do it efficiently?

I am referring to sensor.sample_ray. When I call that function for several pixels (>1000) the time grows tenfolds.

[ziyi-zhang]

Hi,

The argument Float/Point2f are vectors, so all Mitsuba functions are naturally vectorized.
We can get a vector of Point2f sample with mi.Point2f(np.random.rand(1000, 2)) for debug purpose.
In practice we get them from sampler.next_2d() with initialization sampler.seed(seed, wavefront_size). Examples can be found in src/python/python/ad/integrators/common.py

[luca-morreale]

That worked, thank you!