Quadimension (平行四界 Píngxíng Sì Jiè), also known as Beijing FUTUO (北京福托 Běijīng Fútuō), is a small group of Chinese producers that creates and distributes albums of the same name which features the Chinese VOCALOIDs. They collaborated with Shanghai HENIAN Information Technology Co. Ltd. to create a voicebank for their first Chinese VOCALOID, Stardust.
Quadimension began as a group that created doujinshi albums under the same name. These albums mainly featured Luo Tianyi, but began adding more VOCALOIDs since Quadimension 3's release in 2015 . Quadimension collaborated with a variety of producers who became members of the group, but not every person stayed.
In the album pamphlets, their mascot appeared in some of the artwork. This mascot was known as Quadimensionko in the past but eventually became their first VOCALOID, Stardust. Quadimension commissioned Shanghai HENIAN to create a VOCALOID4 voicebank for her while they handled her character and marketing rights. She became the first entry of the Voicebank Customize Project.