Smooth draping layer for rendering vector data on complex three dimensional objects

A non-transitory computer-readable medium storing computer-readable instructions for execution by one or more processors the when executed by the one or more processors cause the one or more processors to perform operations for rendering vector data in conjunction with a three-dimensional model of a geographic area, the three-dimensional model comprising terrain geometry associated with terrain of the geographic area and building geometry associated with one or more buildings in the geographic area, the operations comprising:

• presenting a viewport in a user interface on a display device;
• rendering the three-dimensional model in the viewport, wherein the transparent draping layer is not visible in the representation of the three-dimensional model presented in the viewport, wherein rendering the three-dimensional model comprises;
• rendering the building geometry in the viewport with a first stencil value in a stencil buffer for pixels associated with the building geometry;
• rendering the terrain geometry in the viewport with a second stencil value in a stencil buffer for pixels associated with the terrain geometry;
• and
• clearing a depth buffer at pixels associated with the second stencil value in the stencil buffer;
• rendering a transparent draping layer conforming to the terrain geometry of the three-dimensional model;
• and
• texture mapping the vector data to the transparent draping layer such that the vector data appears to be located along a surface of the three-dimensional model in the viewport, the vector data being occluded at least in part by the building geometry in the three-dimensional model.