The renderer uses ray casting to compute intersections between rays and surfaces and thereby determine which parts of the scene are visible.

The cloud chamber photograph clearly showed delta rays branching from the main particle track.

The cloud chamber image clearly showed a delta ray branching off from the primary alpha track.

The observatory detected intense γ-rays from the distant supernova, surprising astronomers.

While snorkeling near the coral reef, I spotted a butterfly ray gliding just above the sandy bottom.

At dusk, the divers were surprised to see a school of butterfly rays gliding over the sandy seafloor.

The gamma-ray detector recorded an unexpected spike during the experiment.

While snorkeling near the reef, an electric ray suddenly glided beneath us and sent a shocking pulse through the water.

The dentist reviewed the x-rays before deciding on treatment.

The antique medical manual described how a Roentgen-ray could reveal a fractured collarbone.