If one day, your favorite idol suddenly passed away, how would you face it? Maybe you will listen to his album over and over again, watch the videos of his concerts over and over again, and try to catch those precious memories. But if there is a technology that can make these lost superstars stand on the stage again and give you a brand-new concert in the most authentic and shocking way, will you be crazy about it?

This is not the plot in science fiction, but the holographic projection technology is transforming dreams may come. It makes it possible to "resurrect" the dead artists and brings us a series of audio-visual feasts that break through the time limit. This sounds incredible, but its core principle is not complicated. Holographic projection, as its name implies, is to record and reproduce the real three-dimensional image of an object by using the principles of interference and diffraction. It can capture all the details of light, color and shape, convert them into accurate digital data, and then project them into the air through special equipment. When these images are projected onto the stage, a vivid "phantom" is born with lighting, sound and special effects.

But this is far from a simple "shadow play". It needs an extremely large and complex system engineering to make a lost superstar reappear on the stage. First, the technical team needs to collect a large number of images, audio and action data of the artist before his death. From high-definition concert video to daily interviews, from album recording to live improvisation, every subtle expression, every unique dance step and every iconic gesture will be carefully decomposed and captured. These massive data, like DNA in the digital age, together constitute the artist's "digital clone".

Next, it is modeling and rendering. Professional 3D modelers will use these data to build a high-precision digital model of the artist. They should not only restore their appearance, but also accurately simulate their muscle movement, skin texture and even hair swing. At the same time, the rendering engine will give life to this model, let the light and shadow flow on him, and make it present a convincing sense of reality under the stage lighting. This process is like injecting soul into a cold sculpture, making it vivid and three-dimensional.

Finally, there is a stage presentation. At the concert site, the technical team will use a high-power holographic projector to project this digital model to the center of the stage. In order to enhance the sense of immersion, the stage usually uses a special translucent screen or holographic gauze curtain, so that the audience's line of sight can penetrate the "phantom" and see other elements on the stage. At the same time, the live accompaniment band will play the most classic melody, while the "resurrected" artist will perform on the stage according to the preset procedure. His singing comes from precious recordings before his death; His actions are based on data analysis and accurate arrangement. When all this is perfectly integrated, the audience will feel the long-lost touch and shock again as if they had traveled through time and space.

Of course, the holographic projection concert also caused some controversy. Some people think that this is a disrespect for artists and a commercial consumption of their heritage. But others think that this is a new art form and a tribute and continuation of science and technology to art. In any case, this technology is changing our understanding of concerts. It makes those legends last forever, and it also provides us with a unique way to commemorate the artists we loved deeply. Perhaps, one day in the future, holographic projection concert will become a normal state, so that we can meet those great souls again at any time and any place.

（Writer：Juliy）