Olympic opening fireworks
The fireworks show is the biggest highlight of the opening ceremony of the Beijing Olympics. 12 projects, the total time is 16 minutes and 38 seconds, focusing on sacred, magical, innovative, brilliant, brilliant artistic effects; and the Bird's Nest, no matter where you sit, and the line of sight between the center point of the stadium is 140 Around the meter, everyone in the audience can watch the game equally. This is the new feeling that the bird nest brings to the world.
The reporter interviewed Cai Guoqiang, the chief designer of the visual effects art of the opening and closing ceremonies of the Beijing Olympic Games, and Zhao Weiping, the chairman of a fireworks company responsible for providing fireworks products, to reveal your secrets.
[Size decryption]
Decipher how a peony blooms
The first climax point of the bird's nest was to interpret the whole process of the national flower peony from the hustle and bustle to the full bloom. The bird's nest instantly became the red ocean of peony. From the flower bone to the flower petals relay, and then the peony blooms, the peony blooms only take 11 seconds, but the number of fireworks is 4,845.
In order to allow the whole red peony to cover the entire nest, the designer used the computer 3D special effects technology to draw a huge peony covering the roof of the bird's nest, and then selected 85 points of the bird's nest top, each position is responsible for launching 3 Petals, each consisting of 29 fireworks, symbolizes the 29th Olympic Games.
When discharging, in the order from the inside to the outside, the flower core is first emitted, and then the innermost flower petals are emitted, and the outermost petals are sequentially transferred. When the last layer of petals is opened, 85 points are simultaneously activated, and the fireworks are fired.
Decipher how two white pigeons spread their wings
The attentive audience will find that at the opening ceremony, a pair of snow-white wings were born on both sides of the nest, and they were fanned up and down like a dove of peace.
Zhao Weiping told reporters that it is not difficult to let the bird's nest produce wings. The difficulty is that the wings should be fanned up and down. The movement shows that a dove of peace is flying. In order to make this peace pigeon smart, the researchers first improved the effect of the traditional fireworks elements of the white iris, only white light, without the trail left by the tail and the obsolete, which is like the wings of the peace dove. In order to make the wings move, the researchers actuate the frequency of the wings of the flying dove in the flying pigeons, so that the birds in the nest and the average dove fan wings once every 1 second.
Deciphering how the three red flashing nests are moving
A red silk thread in the night sky, wearing a bird's nest full of scenes, like a red neon light constantly flashing, under its embellishment, the entire bird's nest is flashing, running, jumping. The first difficulty of the red flashing bird's nest lies in the arrangement. In order to cover the entire nest, each main beam should be erected at a launch point every five meters. At the junction of the two main beams, a launch point is also set every five meters. The average distribution of all the launch points, the entire nest can jump in the red ocean; the second difficulty is the time difference control, the fireworks at each point must be lit at the same time and extinguished.
How to unlock the four-day door
There was a scene in the opening ceremony: a magnificent arched door that appeared above the nest. Close the door, open a slit to open half, open three quarters, until the Golden Gate finally opens. Experts revealed that it is difficult to open the distance and angle of the sky to the sky. The distance between the first set of launch points and the angle of the horizontal plane must ensure that the fireworks are delivered in an arch shape when they meet in the air; and the distance between the second set of fireworks and the horizontal angle must be guaranteed. When the fireworks meet in the air, there is just a gap, just like the door has just opened a slit, and so on. If the angle is a little bit, the process of opening the door cannot be vividly reproduced.
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By running the grating ruler, the grating bars shield the light source, the light is transmitted between the grating bars and the bars, from which the number of pulses output by the receiver, a certain number of pulses are preset by the encoder, and when the number of output pulses reaches the preset value Just generate a control signal for the actuator to act. This method is generally used in CNC automatic control.
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