| Microsoft DirectX 8.1 (C++) |
The BumpWaves sample demonstrates the bump mapping capabilities of Microsoft® Direct3D®. Bump mapping is a multitexture-blending technique that renders the appearance of rough, bumpy surfaces. This sample renders a waterfront scene with only four triangles. The waves in the scene are completely fabricated with a bump map.
Not all cards support all features for bump mapping techniques. Some hardware has no, or limited, bump mapping support. For more information on bump mapping, refer to the Microsoft DirectX® SDK documentation.
This sample also uses a technique called projected textures, which is a texture-coordinate generation technique and is not the focal point of the sample. For more information on texture-coordinate generation, see Bump Mapping.
Source: (SDK root)\Samples\Multimedia\Direct3D\BumpMapping\BumpWaves
Executable: (SDK root)\Samples\Multimedia\Direct3D\Bin
The following table lists the keys that are implemented. You can use menu commands for the same controls.
| Key | Action |
|---|---|
| ENTER | Starts and stops the scene. |
| SPACEBAR | Advances the scene by a small increment. |
| F2 | Prompts the user to select a new rendering device or display mode. |
| ALT+ENTER | Toggles between full-screen and windowed modes. |
| ESC | Exits the application. |
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.
In this sample, bump mapping is used to generate waves in a scene. The backdrop is used as a projective texture for the environment map, so it reflects in the waves. The waves themselves appear to be generated with many polygons. However, it is one large quad.
This sample uses common Microsoft DirectX code that consists programming elements such as helper functions. This code is shared with other samples in the DirectX SDK. You can find the common headers and source code in (SDK root)\Samples\Multimedia\Common.