С ума сойти, в ней это называется, чуть ли не главным козырем:
"
Advanced Lighting:
Ray tracing is a great technique to achive photo-realistic rendering. However, some lighting phenomena in the
real world cannot be simulated with standard ray tracing. Examples of these are effects like soft indirect
illumination, color bleeding and caustics. An example of color bleeding is a red carpet that gives a white wall a red
tint, see figure 44. Caustics are bright spots on surfaces caused by light being focused when reflected or refracted
from other surfaces. An example is the focused light pattern that appears at the bottom of a swimming pool, see
figure 45.
44 Color bleeding
45 Caustics
Global Illumination is a term used for algorithms that solve all or some of these problems. During the last 20 years
many different algorithms have been invented, all of them with different pros and cons. Turtle includes
implementations of Photon Mapping, Final Gather, Ambient Occlusion and Image Based Lighting."
В Черепашке Color Bleed - ЭТО достижение, в отличие, от нас, полиграфистов, которые всеми правдами и не... борются с этим.
Все время замечал этот феномен, но предвзятость,- вещь объективная...

((