Toggle Physics <+> Add Ball <-> Delete Ball <*> Add Light Delete Light <0-9> Select room's lit rendering technique. Select room's ambient rendering technique. Note: 8-bit stencil must be enabled in the D3D tab of the display control panel. Programming Notes ================= Most of the pertinent code is in the root of the project. The shadow volumes are managed in ShadowPOF.cpp and rendered through shadow.sha The general idea is to create a static geometry that can be modified into a shadow volume from any light direction. To do this a geometry is created with all of the original faces and their face normals, and every edge is changed into an invisible quad connecting the two neighboring faces. The face normals are used to calculate if a face is front or back facing to the light. Back facing faces are pushed away from the light to the light's range, ripping the faces on silhouette edges apart exposing the invisible quad, which then forms the shadow volume. No shadow geometry needs to be created per frame. There are techniques that can extend this to animated geometry as well. The floor shaders contain the examples of per pixel lighting for volumetric light attenuation and diffuse and specular bump mapping. See the floor shaders. This sample makes use of common DirectX code (consisting of helper functions, etc.) that is shared with other samples on the DirectX SDK. All common headers and source code can be found in the following directory: Mssdk\Samples\Multimedia\Common