光照示例

技巧如下：

在设置可变顶点格式时加入法线和漫反色，如下所示：

// The 3D vertex format and descriptor
typedef struct
{
    float x, y, z;      // 3D coordinates    
    float nx, ny, nz;   // normals
    D3DCOLOR diffuse;   // color
} VERTEX;

#define VERTEX_FVF   (D3DFVF_XYZ | D3DFVF_NORMAL | D3DFVF_DIFFUSE)

开启光照和Z缓存：

    // enable d3d lighting
    g_d3d_device->SetRenderState(D3DRS_LIGHTING, TRUE);
    // enable z-buffer
    g_d3d_device->SetRenderState(D3DRS_ZENABLE, D3DZB_TRUE);

设置光源属性并打开光源：

    D3DLIGHT9 light;

    // set light data, color, position, range.
    ZeroMemory(&light, sizeof(light));

    light.Type      = D3DLIGHT_POINT;
    light.Diffuse.r = light.Ambient.r = 0.5;
    light.Diffuse.g = light.Ambient.g = 0.5;
    light.Diffuse.b = light.Ambient.b = 0.0;
    light.Diffuse.a = light.Ambient.a = 1.0;
    light.Range         = 1000.0;
    light.Attenuation0  = 0.5;
    light.Position.x    = 300.0;
    light.Position.y    = 0.0;
    light.Position.z    = -600.0;

    // set and enable the light
    g_d3d_device->SetLight(0, &light);
    g_d3d_device->LightEnable(0, TRUE);

完整源码如下：

/***************************************************************************************
PURPOSE:
    Light Demo

Required libraries:
  WINMM.LIB, D3D9.LIB, D3DX9.LIB.
 ***************************************************************************************/

#include <windows.h>
#include <stdio.h>
#include "d3d9.h"
#include "d3dx9.h"

#pragma comment(lib, "winmm.lib")
#pragma comment(lib, "d3d9.lib")
#pragma comment(lib, "d3dx9.lib")

#pragma warning(disable : 4305)

#define WINDOW_WIDTH    400
#define WINDOW_HEIGHT   400

#define Safe_Release(p) if((p)) (p)->Release();

// window handles, class and caption text.
HWND g_hwnd;
HINSTANCE g_inst;
static char g_class_name[] = "LightClass";
static char g_caption[]    = "Light Demo";

// the Direct3D and device object
IDirect3D9* g_d3d = NULL;
IDirect3DDevice9* g_d3d_device = NULL;

// The 3D vertex format and descriptor
typedef struct
{
    float x, y, z;      // 3D coordinates    
    float nx, ny, nz;   // normals
    D3DCOLOR diffuse;   // color
} VERTEX;

#define VERTEX_FVF   (D3DFVF_XYZ | D3DFVF_NORMAL | D3DFVF_DIFFUSE)

IDirect3DVertexBuffer9* g_vertex_buffer = NULL;

//--------------------------------------------------------------------------------
// Window procedure.
//--------------------------------------------------------------------------------
long WINAPI Window_Proc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return (long) DefWindowProc(hwnd, msg, wParam, lParam);
}

//--------------------------------------------------------------------------------
// Initialize d3d, d3d device, vertex buffer, texutre; set render state for d3d;
// set perspective matrix and view matrix.
//--------------------------------------------------------------------------------
BOOL Do_Init()
{
    D3DPRESENT_PARAMETERS present_param;
    D3DDISPLAYMODE  display_mode;
    D3DXMATRIX mat_proj, mat_view;
    D3DLIGHT9 light;
    BYTE* vertex_ptr;

    // initialize vertex data
    VERTEX verts[] = {
        { -100.0f,  100.0f, -100.0f, 0.0f,0.0f,-1.0f, D3DCOLOR_RGBA(255,255,255,255) },
        {  100.0f,  100.0f, -100.0f, 0.0f,0.0f,-1.0f, D3DCOLOR_RGBA(255,255,255,255) },
        { -100.0f, -100.0f, -100.0f, 0.0f,0.0f,-1.0f, D3DCOLOR_RGBA(255,255,255,255) },
        {  100.0f, -100.0f, -100.0f, 0.0f,0.0f,-1.0f, D3DCOLOR_RGBA(255,255,255,255) },

        {  100.0f,  100.0f, -100.0f, 1.0f,0.0f,0.0f, D3DCOLOR_RGBA(255,255,255,255) },
        {  100.0f,  100.0f,  100.0f, 1.0f,0.0f,0.0f, D3DCOLOR_RGBA(255,255,255,255) },
        {  100.0f, -100.0f, -100.0f, 1.0f,0.0f,0.0f, D3DCOLOR_RGBA(255,255,255,255) },
        {  100.0f, -100.0f,  100.0f, 1.0f,0.0f,0.0f, D3DCOLOR_RGBA(255,255,255,255) },

        {  100.0f,  100.0f,  100.0f, 0.0f,0.0f,1.0f, D3DCOLOR_RGBA(255,255,255,255) },
        { -100.0f,  100.0f,  100.0f, 0.0f,0.0f,1.0f, D3DCOLOR_RGBA(255,255,255,255) },
        {  100.0f, -100.0f,  100.0f, 0.0f,0.0f,1.0f, D3DCOLOR_RGBA(255,255,255,255) },
        { -100.0f, -100.0f,  100.0f, 0.0f,0.0f,1.0f, D3DCOLOR_RGBA(255,255,255,255) },

        { -100.0f,  100.0f,  100.0f, -1.0f,0.0f,0.0f, D3DCOLOR_RGBA(255,255,255,255) },
        { -100.0f,  100.0f, -100.0f, -1.0f,0.0f,0.0f, D3DCOLOR_RGBA(255,255,255,255) },
        { -100.0f, -100.0f,  100.0f, -1.0f,0.0f,0.0f, D3DCOLOR_RGBA(255,255,255,255) },
        { -100.0f, -100.0f, -100.0f, -1.0f,0.0f,0.0f, D3DCOLOR_RGBA(255,255,255,255) }
    }; 

    // do a windowed mode initialization of Direct3D
    if((g_d3d = Direct3DCreate9(D3D_SDK_VERSION)) == NULL)
        return FALSE;

    // retrieves the current display mode of the adapter
    if(FAILED(g_d3d->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &display_mode)))
        return FALSE;

    ZeroMemory(&present_param, sizeof(present_param));

    // initialize d3d presentation parameter
    present_param.Windowed               = TRUE;
    present_param.SwapEffect             = D3DSWAPEFFECT_DISCARD;
    present_param.BackBufferFormat       = display_mode.Format;
    present_param.EnableAutoDepthStencil = TRUE;
    present_param.AutoDepthStencilFormat = D3DFMT_D16;

    // creates a device to represent the display adapter
    if(FAILED(g_d3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, g_hwnd,
                                  D3DCREATE_SOFTWARE_VERTEXPROCESSING, &present_param, &g_d3d_device)))
        return FALSE;     

    // set render state

    // enable d3d lighting
    g_d3d_device->SetRenderState(D3DRS_LIGHTING, TRUE);
    // enable z-buffer
    g_d3d_device->SetRenderState(D3DRS_ZENABLE, D3DZB_TRUE);

    // create and set the projection matrix

    // builds a left-handed perspective projection matrix based on a field of view
    D3DXMatrixPerspectiveFovLH(&mat_proj, D3DX_PI/4.0, 1.33333, 1.0, 1000.0);

    // sets a single device transformation-related state
    g_d3d_device->SetTransform(D3DTS_PROJECTION, &mat_proj);

    // create and set the view matrix
    D3DXMatrixLookAtLH(&mat_view, 
                       &D3DXVECTOR3(0.0, 0.0, -500.0),
                       &D3DXVECTOR3(0.0f, 0.0f, 0.0f), 
                       &D3DXVECTOR3(0.0f, 1.0f, 0.0f));

    g_d3d_device->SetTransform(D3DTS_VIEW, &mat_view);

    // create the vertex buffer and set data
    g_d3d_device->CreateVertexBuffer(sizeof(VERTEX) * 16, 0, VERTEX_FVF, D3DPOOL_DEFAULT, &g_vertex_buffer, NULL);

    // locks a range of vertex data and obtains a pointer to the vertex buffer memory
    g_vertex_buffer->Lock(0, 0, (void**)&vertex_ptr, 0);

    memcpy(vertex_ptr, verts, sizeof(verts));

    // unlocks vertex data
    g_vertex_buffer->Unlock();

    // set light data, color, position, range.
    ZeroMemory(&light, sizeof(light));

    light.Type      = D3DLIGHT_POINT;
    light.Diffuse.r = light.Ambient.r = 0.5;
    light.Diffuse.g = light.Ambient.g = 0.5;
    light.Diffuse.b = light.Ambient.b = 0.0;
    light.Diffuse.a = light.Ambient.a = 1.0;
    light.Range         = 1000.0;
    light.Attenuation0  = 0.5;
    light.Position.x    = 300.0;
    light.Position.y    = 0.0;
    light.Position.z    = -600.0;

    // set and enable the light
    g_d3d_device->SetLight(0, &light);
    g_d3d_device->LightEnable(0, TRUE);

    return TRUE;
}

//--------------------------------------------------------------------------------
// Release all d3d resource.
//--------------------------------------------------------------------------------
BOOL Do_Shutdown()
{
    Safe_Release(g_vertex_buffer);
    Safe_Release(g_d3d_device);
    Safe_Release(g_d3d);

    return TRUE;
}

//--------------------------------------------------------------------------------
// Render a frame.
//--------------------------------------------------------------------------------
BOOL Do_Frame()
{
    D3DXMATRIX mat_world;

    // clear device back buffer
    g_d3d_device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_RGBA(0, 0, 0, 255), 1.0f, 0);

    // Begin scene
    if(SUCCEEDED(g_d3d_device->BeginScene()))
    {
        // create and set the world transformation matrix
        // rotate object along y-axis
        D3DXMatrixRotationY(&mat_world, (float) (timeGetTime() / 1000.0));
        
        g_d3d_device->SetTransform(D3DTS_WORLD, &mat_world);

        // set the vertex stream, shader.

        // binds a vertex buffer to a device data stream
        g_d3d_device->SetStreamSource(0, g_vertex_buffer, 0, sizeof(VERTEX));

        // set the current vertex stream declation
        g_d3d_device->SetFVF(VERTEX_FVF);

        // draw the vertex buffer
        for(short i = 0; i < 4; i++)
            g_d3d_device->DrawPrimitive(D3DPT_TRIANGLESTRIP, i * 4, 2);

        // end the scene
        g_d3d_device->EndScene();
    }

    // present the contents of the next buffer in the sequence of back buffers owned by the device
    g_d3d_device->Present(NULL, NULL, NULL, NULL);

    return TRUE;
}

//--------------------------------------------------------------------------------
// Main function, routine entry.
//--------------------------------------------------------------------------------
int WINAPI WinMain(HINSTANCE inst, HINSTANCE, LPSTR cmd_line, int cmd_show)
{
    WNDCLASSEX  win_class;
    MSG         msg;

    g_inst = inst;

    // create window class and register it
    win_class.cbSize        = sizeof(win_class);
    win_class.style         = CS_CLASSDC;
    win_class.lpfnWndProc   = Window_Proc;
    win_class.cbClsExtra    = 0;
    win_class.cbWndExtra    = 0;
    win_class.hInstance     = inst;
    win_class.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    win_class.hCursor       = LoadCursor(NULL, IDC_ARROW);
    win_class.hbrBackground = NULL;
    win_class.lpszMenuName  = NULL;
    win_class.lpszClassName = g_class_name;
    win_class.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

    if(! RegisterClassEx(&win_class))
        return FALSE;

    // create the main window
    g_hwnd = CreateWindow(g_class_name, g_caption, WS_CAPTION | WS_SYSMENU, 0, 0,
                          WINDOW_WIDTH, WINDOW_HEIGHT, NULL, NULL, inst, NULL);

    if(g_hwnd == NULL)
        return FALSE;

    ShowWindow(g_hwnd, SW_NORMAL);
    UpdateWindow(g_hwnd);

    // initialize game
    if(Do_Init() == FALSE)
        return FALSE;

    // start message pump, waiting for signal to quit.
    ZeroMemory(&msg, sizeof(MSG));

    while(msg.message != WM_QUIT)
    {
        if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        
        // draw a frame
        if(Do_Frame() == FALSE)
            break;
    }

    // run shutdown function
    Do_Shutdown();

    UnregisterClass(g_class_name, inst);
    
    return (int) msg.wParam;
}

效果图：