[Hold space] to disable preview mode (Makes ray invisible) If look at the variable in the corner, you can see that the Ray knows what its looking at with almost instant feedback.a Feel free to remix, this is meant to help out others on their projects!
The Ray is frame rate dependent so the lower the frame rate the less accurate the Ray is, but if doesn't really matter until its below 5fps, so it shouldn't be a huge problem. The whole Ray tracing system can be boiled down to 20 blocks, but there are more in there just to make it better for this demonstration.