This week was mostly animation, the animation of the cat’s body part was done.
Cats have a very special bone structure. Studies have shown that cats have widely spaced vertebrae with elastic fibrocartilage interspersed between them, which makes cats more flexible. Compared to large cats, this body structure allows cats to be more flexible. Second, they can rotate the spine 180 degrees, while humans can only rotate 90 degrees.
Cats’ eyes have strong dynamic vision and can see three times as many frames as humans, and high-speed moving objects appear to them as slow motion. However, cats also have a disadvantage, that is, myopia. They cannot focus on objects within 30 cm and can only be judged by their whiskers and smell. This is why cats like to aim at distant objects first and see that they are charging and sprinting.
In fact, there is not much difference in the speed of nerve transmission in various animals. The only difference is probably only the length of the neural circuit, and the cat’s body is much smaller than the human body. The nervous system is much faster than us humans, both in input and output.
When we start from another aspect, that is, the conditioned reflex of neural activity, it is not difficult to find that the cat’s response is faster than our human’s. We all know that the parts below the cerebral cortex of mammals such as The low-level centers such as the oblongata and spinal cord control the low-level neural activities of animals. The basic form is unconditioned reflex. The reflexes mainly include knee-jerk reflex, eye blink reflex, retraction reflex, baby’s sucking, urination reflex, and the unconditioned reflex of feline not only has the instinct of breathing and feeding, but also includes the food reflex. , defensive reflex, hunting reflex and postural reflex to maintain body balance.
For us humans, many unconditioned reflexes are no longer necessary for survival in a long time, but not for animals. For animals, these unconditioned reflexes are actually equivalent to their survival. In the case of external stimuli, in fact, the unconditioned reflexes of these animals are like some of our human actions that can be responded to in an instant without thinking through the brain, but the unconditioned reflexes possessed by humans are similar to those of cats. The unconditioned reflexes of animals are different. Many stimuli for us humans are received from the nervous system, and then analyzed by the corresponding brain regions, and then submitted to the prefrontal lobe for intellectual analysis and decision. …this series of processes is at least half a beat slower than the animal’s unconditioned reflex.
It’s just that for us humans, we humans act with rational thinking, not like animals that do not have the process of thinking to produce unconditioned reflexes to stimuli, so our human reaction speed is faster than a certain It is reasonable for some animals to be slow. After all, every action of human beings requires a layer of rational thinking and choice than animals.
Because the cat’s reaction ability is very fast, the cat’s action frequency is fast and the amplitude is large, so it has caused great difficulties and troubles in the process of making animation.
There are several poses in one second. Moqi’s body often twists from S-shape to reverse-S-shape within a few frames, because the core of the controllers is on his ass, and if you adjust one of the controllers, the others will follow. So while it doesn’t seem like the range of motion is significant, all of the body’s controllers need to be adjusted. Moreover, it is much more difficult to animate a 4-legged animal than a two-legged human. The time it takes for each of his feet to fall and lift is different. These all require frame-by-frame, controller-by-controller adjustments.
It can be clearly seen from this picture. How many keyframes are there for the animation of the cat’s body parts. It’s a really big project!