A rendering method that was based on the stencil shadow volume theory was presented,which allowed high-quality real-time overlay of vector data on virtual landscapes.

This method combines the strengths of shadow maps and shadow volumes.

This article introduced the general theory of stencil test and building shadow volume firstly,then analysis steps and details of implementing real-time shadows used stencil test and shadows volume technique,and developed a demo program used DirectX to test.

Rendering vector data over 3D terrain based on stencil shadow volume algorithm

In this paper,we analyse the expression mode and character of situation symbol are analyzed,and a new rendering method of complex situation symbol over 3D terrain is preserted based on the stencil shadow volume technique,expecting the objective of hypsography.

In this paper,we analyzed the representation mode and character of situation symbol,presented a new rendering method of complex situation symbol over 3D terrain based on the stencil shadow volume technique,and realized the objective of displaying according to terrain.

The character and the position of shadow lines on the spheroid are discussed based on light most in use,and according to the principle of the spheroid shadow formed in two projecting planes,the mathematical models of the spheroid shadow on the projecting planes and general planes are established by the method of coordinate transformation.