Three-dimensional model collision detection method based on interface mark

The invention discloses a three-dimensional model collision detection method based on an interface mark, and the method comprises the steps that a use selects one or more building blocks and enables the building block to move and be placed freely on a bottom plate in 3D building block virtual building software, and carries out the jointing of the building block with other building blocks, therebyforming an unique 3D model or scene; a 3D building block collision detection method based on an interface mark is employed in the building block moving and jointing process for judging whether the building block collides with other building blocks or not, thereby determining whether the selected building block can be placed or jointed with other building blocks or not. If the building block collides with other building blocks, the building block cannot be placed at the position or jointed with other building blocks. The method can adapt to 3D building block models in different shapes, employsa method for manual marking of a collision detection interface for replacing a grid collision device which is carried by a building block 3D model, is smaller in calculation resource waste, and is more flexible and precise in collision detection.