Microsoft DirectX 9.0

Bump Lens Sample


The Bump Lens sample demonstrates a lens effect that can be achieved using bump mapping. Bump mapping is a multitexture-blending technique that renders the appearance of rough, bumpy surfaces but can also be used for other effects, as shown here.

Not all cards support all features for bump mapping techniques. Some hardware has no, or limited, bump mapping support. For more information about bump mapping, see Bump Mapping.


Source: (SDK root)\Samples\C++\Direct3D\BumpMapping\BumpLens

Executable: (SDK root)\Samples\C++\Direct3D\Bin

User's Guide

The following table lists the keys that are implemented. You can use menu commands for the same controls.

ENTERStarts and stops the scene.
SPACEBARAdvances the scene by a small increment.
F2Prompts the user to select a new rendering device or display mode.
ALT+ENTERToggles between full-screen and windowed modes.
ESCExits the application.

Programming Notes

A bump map is a texture that stores the perturbation data. Bump mapping requires two textures. One is an environment map, which contains the lights that you see in the scene. The other is the actual bump mapping, which contain values—stored as du and dv—used to bump the environment map's texture coordinates. Some bump maps also contain luminance values to control the shininess of a particular texel.

This sample uses bump mapping in a nontraditional fashion. Because bump mapping only perturbs an environment map, it can be used for other effects. In this case, it is used to perturb a background image, which can be rendered on the fly, to make a lens effect.

This sample uses common Microsoft?DirectX?code that consists of programming elements such as helper functions. This code is shared with other samples in the DirectX software development kit (SDK). You can find the sample framework headers and source code in (SDK root)\DXSDK\Samples\C++\Common\Include and (SDK root)\DXSDK\Samples\C++\Common\Src.

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