City University has unveiled a three-dimensional computer project called Body Brush, which it says is a coming together of art and technology. The system installed at City University's campus in Kowloon Tong uses two cameras to capture motion and university-designed software to translate that motion into sweeping brush strokes on a 3D canvas. Professor Horace Ip Ho-shing, head of the university's computer science department and one of the system designers, said the system followed the motion of the painter in real-time and mapped out the painting almost simultaneously. Body Brush's creators, including Hong Kong artist Young Hay, said the inspiration for the project came from artists such as Jackson Pollock, whose experimental use of paint in his abstract art inspired nicknames such as Jack the Dripper. Mr Ip said this week's demonstration was held partly to get further input from the city's arts community and announce that there were plans to add a sound dimension to the system, which was written using the C++ computer code. 'Instead of mapping body posture to visual art, we could map it to audio to generate image and sound,' he said. 'And again, you could use it as a combination of performing arts and visual arts.' Mr Ip said there also were practical applications for the Body Brush system. As the program interpreted human posture and made appropriate reactions, it could be used to control other devices, such as switching on the lights at home or for alerts. On hand to demonstrate Body Brush yesterday was Mui Cheuk-yin, an associate choreographer at the City Contemporary Dance Co. The computer program analysed Ms Mui's movement and mapped them to certain characteristics in the painting, with colour saturation correlating to the acceleration of her motion and colour brush size correlating to the size of her gestures. The Body Brush system has been selected as an exhibit for the Hong Kong Museum of Arts biennial event, which starts in the middle of this month, and possible future plans include moving it to the museum as a more permanent exhibit.