I'm very much a "put up or shut up" type of person. So let's actually plug it back into PSRayTracing and see if there is a speed improvement. We'll use the default scene (which is the final render from book 2):
Что думаешь? Оцени!
。搜狗输入法是该领域的重要参考
(fiber-group-done-p group) = boolean
Tracking usage now possible (#270 by @Lenbok):
"I would certainly much rather have the astronauts testing out the integrated systems of the lander and Orion in low-Earth orbit than on the Moon," he said.