正在查找Direct3D细分的代码示例

我正在尝试学习如何使用Direct3D函数D3DXTessellatedRectPatch： msdn.microsoft.com/en-us/library/bb205471v=VS.85.aspx

我发现MSDN文档非常有用，并且能够实现 单个矩形贴片

我现在正在尝试对一个由32个双三次Bezier 3D面片组成的网格进行细分，该面片位于犹他州的茶壶上

我尝试了一种简单的方法-分别对每条贝塞尔曲线进行细分，然后连接顶点和顶点 适当索引，考虑顶点偏移，以创建细分的合并网格

然而，这似乎并没有达到预期的效果

如果有人对这个问题有任何提示，或者更好的是，有代码示例，我们将不胜感激

具体而言，我已检查： Www.directxtural.com

还有另一个Direct3D参考，还有谷歌

谢谢，期待您的建议/指点

你的

---

Misha

Tim C Schroeder帮了大忙，建议我使用ID3DXPatchMesh。下面是一些在tester.cpp文件中生成镶嵌茶壶位置的示例代码：

// Main D3DX framework from www.directxtutorial.com (free section) 
#include <assert.h>
#include <stdio.h>

// include the basic windows header files and the Direct3D header file
#include <windows.h>
#include <windowsx.h>
#include <d3d9.h>
#include <d3dx9.h>

// define the screen resolution
#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 600

// include the Direct3D Library files
#pragma comment (lib, "d3d9.lib")
#pragma comment (lib, "d3dx9.lib")

// global declarations
LPDIRECT3D9 d3d;
LPDIRECT3DDEVICE9 d3ddev;
LPD3DXMESH mesh = NULL;    // define the mesh pointer

// function prototypes
void initD3D(HWND hWnd);
void render_frame(void);
void cleanD3D(void);
void init_graphics(void);

struct vertex_data 
{
    D3DXVECTOR3 position;
    DWORD color;
};
#define FVF_VERTEX_DATA (D3DFVF_XYZ | D3DFVF_DIFFUSE)

// the WindowProc function prototype
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

// the entry point for any Windows program
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    HWND hWnd;
    WNDCLASSEX wc;

    ZeroMemory(&wc, sizeof(WNDCLASSEX));

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = "WindowClass";

    RegisterClassEx(&wc);

    hWnd = CreateWindowEx(NULL, "WindowClass", "Our Direct3D Program",
                          WS_OVERLAPPEDWINDOW, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
                          NULL, NULL, hInstance, NULL);

    ShowWindow(hWnd, nCmdShow);

    initD3D(hWnd);

    MSG msg;

    while(TRUE)
    {
        while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

        if(msg.message == WM_QUIT)
            break;

        render_frame();
    }

    cleanD3D();

    return msg.wParam;
}

// this is the main message handler for the program
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc (hWnd, message, wParam, lParam);
}

// this function initializes and prepares Direct3D for use
void initD3D(HWND hWnd)
{
    d3d = Direct3DCreate9(D3D_SDK_VERSION);

    D3DPRESENT_PARAMETERS d3dpp;

    ZeroMemory(&d3dpp, sizeof(d3dpp));
    d3dpp.Windowed = TRUE;
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    d3dpp.hDeviceWindow = hWnd;
    d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;
    d3dpp.BackBufferWidth = SCREEN_WIDTH;
    d3dpp.BackBufferHeight = SCREEN_HEIGHT;
    d3dpp.EnableAutoDepthStencil = TRUE;
    d3dpp.AutoDepthStencilFormat = D3DFMT_D16;

    d3d->CreateDevice(D3DADAPTER_DEFAULT,
                      D3DDEVTYPE_HAL,
                      hWnd,
                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                      &d3dpp,
                      &d3ddev);

    init_graphics();

    d3ddev->SetRenderState(D3DRS_LIGHTING, FALSE);    // turn off the 3D lighting
    d3ddev->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);    // turn off culling
    d3ddev->SetRenderState(D3DRS_ZENABLE, TRUE);    // turn on the z-buffer
}

// this is the function used to render a single frame
void render_frame(void)
{
    d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);
    d3ddev->Clear(0, NULL, D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);

    d3ddev->BeginScene();

    d3ddev->SetFVF(FVF_VERTEX_DATA);

    // set the view transform
    D3DXMATRIX matView;    // the view transform matrix
    D3DXMatrixLookAtLH(&matView,
    &D3DXVECTOR3 (0.0f, 8.0f, 25.0f),    // the camera position
    &D3DXVECTOR3 (0.0f, 0.0f, 0.0f),      // the look-at position
    &D3DXVECTOR3 (0.0f, 1.0f, 0.0f));    // the up direction
    d3ddev->SetTransform(D3DTS_VIEW, &matView);    // set the view transform to matView

    // set the projection transform
    D3DXMATRIX matProjection;    // the projection transform matrix
    D3DXMatrixPerspectiveFovLH(&matProjection,
                               D3DXToRadian(45),    // the horizontal field of view
                               (FLOAT)SCREEN_WIDTH / (FLOAT)SCREEN_HEIGHT, // aspect ratio
                               1.0f,   // the near view-plane
                               100.0f);    // the far view-plane
    d3ddev->SetTransform(D3DTS_PROJECTION, &matProjection); // set the projection

    // set the world transform
    static float index = 0.0f; index+=0.03f; // an ever-increasing float value
    D3DXMATRIX matRotateY;    // a matrix to store the rotation for each triangle
    D3DXMatrixRotationY(&matRotateY, index);    // the rotation matrix
    d3ddev->SetTransform(D3DTS_WORLD, &(matRotateY));    // set the world transform

    if (mesh) mesh->DrawSubset(0);     

    d3ddev->EndScene(); 

    d3ddev->Present(NULL, NULL, NULL, NULL);
}

// this is the function that cleans up Direct3D and COM
void cleanD3D(void)
{
    if (mesh) mesh->Release();
    d3ddev->Release();
    d3d->Release();
}

#define MAX_PATCHES 1000
#define POINTS_PER_PATCH 16
int num_patches = -1;
int patches[MAX_PATCHES][POINTS_PER_PATCH];

void B_patch(int ii, int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, int n, int o, int p)
{
    assert(ii < MAX_PATCHES);
    patches[ii][0] = a-1;
    patches[ii][1] = b-1;
    patches[ii][2] = c-1;
    patches[ii][3] = d-1;
    patches[ii][4] = e-1;
    patches[ii][5] = f-1;
    patches[ii][6] = g-1;
    patches[ii][7] = h-1;
    patches[ii][8] = i-1;
    patches[ii][9] = j-1;
    patches[ii][10] = k-1;
    patches[ii][11] = l-1;
    patches[ii][12] = m-1;
    patches[ii][13] = n-1;
    patches[ii][14] = o-1;
    patches[ii][15] = p-1;
    assert(POINTS_PER_PATCH==16);
}

#define MAX_POINTS 1000
int num_points = -1;
D3DXVECTOR3 points[MAX_POINTS];

void B_point(int ii, double x, double y, double z)
{
    ii--;
    assert(ii < MAX_POINTS);
    points[ii].x = x;
    /*** Y AND Z FLIPPED ***/
    points[ii].y = z;
    points[ii].z = y;
}

// BEGIN http://www.sjbaker.org/teapot/teaset.tgz

/*
 *  The file input.c  -- Juhana Kouhia, jk87377@cs.tut.fi, Oct. 25, 1991
 *
 *  Load_patch(filename, patches, vertices);
 *    char *filename; int *patches, *vertices;  
 *    A sample program to read Bezier patches in.
 *    Returns count of patches and vertices.
 *  User defined subroutines:
 *    B_patch(ii, a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p);
 *      int ii, a, b, ..., p;
 *      Defines one Bezier patch with index number ii,
 *      indexes to points are in a, b, c, ..., p.
 *    B_point(ii, x, y, z);
 *      int ii; double x, y, z;
 *      Defines one point with index number ii.
 */

#include <stdio.h>

// Modified to work with g++
void Load_patch(char *filename, int *patches, int *vertices)
{
  int ii;
  float x,y,z;
  int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p;

  FILE *fp;

  if (!(fp = fopen(filename,"r"))) {
    fprintf(stderr,"Load_patch: Can't open %s\n",filename);
    exit(1);
  }

  (void)fscanf(fp,"%i\n",patches);
  for (ii = 0; ii < *patches; ii++) {
    (void)fscanf(fp,"%i, %i, %i, %i,",&a,&b,&c,&d);
    (void)fscanf(fp,"%i, %i, %i, %i,",&e,&f,&g,&h);
    (void)fscanf(fp,"%i, %i, %i, %i,",&i,&j,&k,&l);
    (void)fscanf(fp,"%i, %i, %i, %i\n",&m,&n,&o,&p);
    B_patch(ii, a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p);
  }
  (void)fscanf(fp,"%i\n",vertices);
  for (ii = 1; ii <= *vertices; ii++) {
    (void)fscanf(fp,"%f, %f, %f\n",&x,&y,&z);
    B_point(ii, (double)x,(double)y,(double)z);
  }
}

// END http://www.sjbaker.org/teapot/teaset.tgz

// this is the function that puts the 3D models into video RAM
void init_graphics(void)
{
    // load patch
    char filename[255];
    sprintf(filename,"teapot");
    Load_patch(filename,&num_patches,&num_points);
    printf("Loaded patch %s with %d patches and %d vertices.\n",
           filename,num_patches,num_points);

    // create declarator from FVF
    D3DVERTEXELEMENT9 inDecl[MAX_FVF_DECL_SIZE];
    if (!SUCCEEDED(D3DXDeclaratorFromFVF(FVF_VERTEX_DATA,inDecl)))
        assert(FALSE);    

    // create patch mesh
    LPD3DXPATCHMESH p_mesh;
    D3DXPATCHINFO info;
    info.PatchType = D3DXPATCHMESH_RECT;
    info.Degree = D3DDEGREE_CUBIC;
    info.Basis = D3DBASIS_BEZIER;

    if (!SUCCEEDED(D3DXCreatePatchMesh(&info,num_patches,num_points,0,inDecl,d3ddev,&p_mesh)))
        assert(FALSE);
    assert(p_mesh->GetControlVerticesPerPatch()==POINTS_PER_PATCH);

    // copy vertices
    LPDIRECT3DVERTEXBUFFER9 v_buffer = NULL;
    if (!SUCCEEDED(p_mesh->GetVertexBuffer(&v_buffer))) 
        assert(FALSE);
    struct vertex_data* vertex_data = NULL;
    DWORD number_of_vertices=p_mesh->GetNumVertices();
    assert(number_of_vertices==num_points);
    if (!SUCCEEDED(v_buffer->Lock(0,number_of_vertices*sizeof(struct vertex_data),(void **)&vertex_data,D3DLOCK_DISCARD)))
        assert(FALSE);
    for (int i=0; i<num_points; i++)
    {
        vertex_data[i].position.x = points[i].x;
        vertex_data[i].position.y = points[i].y;
        vertex_data[i].position.z = points[i].z;
        vertex_data[i].color = D3DCOLOR_XRGB(255,0,0);
    }
    v_buffer->Unlock();
    v_buffer->Release();    

    // copy indices
    LPDIRECT3DINDEXBUFFER9 i_buffer = NULL;
    if (!SUCCEEDED(p_mesh->GetIndexBuffer(&i_buffer))) 
        assert(FALSE);
    D3DINDEXBUFFER_DESC i_buffer_desc;
    if (!SUCCEEDED(i_buffer->GetDesc(&i_buffer_desc)))
        assert(FALSE);
    assert(i_buffer_desc.Size==num_patches*POINTS_PER_PATCH*sizeof(WORD));
    WORD* index_data = NULL;
    if (!SUCCEEDED(i_buffer->Lock(0,0,(void **)&index_data,D3DLOCK_DISCARD)))
        assert(FALSE);
    int idx=0;
    for (int i=0; i<num_patches; i++)
    {
        for (int j=0; j<POINTS_PER_PATCH; j++)
        {
            index_data[idx] = patches[i][j];
            idx++;
        }
    }
    i_buffer->Unlock();
    i_buffer->Release();    

    // create mesh for tesselation
    FLOAT fTessLevel=1.0f;
    DWORD Adaptive=FALSE;
    DWORD NumTriangles,NumVertices;
    if (!SUCCEEDED(p_mesh->GetTessSize(fTessLevel,Adaptive,&NumTriangles,&NumVertices)))
        assert(FALSE);
    if (!SUCCEEDED(D3DXCreateMeshFVF(NumTriangles,NumVertices,D3DXMESH_MANAGED,FVF_VERTEX_DATA,d3ddev,&mesh)))
        assert(FALSE);

    // tesselate
    assert(Adaptive==FALSE);
    if (!SUCCEEDED(p_mesh->Tessellate(fTessLevel,mesh)))
        assert(FALSE);
    printf("Generated tesselated mesh with %d triangles, %d vertices\n",NumTriangles,NumVertices);

    p_mesh->Release();
}

最后，要在Ubuntu 10.04 amd64上使用mingw并安装适当的软件进行编译：

#!/bin/bash
rm tester.exe > /dev/null 2>&1
i586-mingw32msvc-g++ tester.cpp -o tester.exe -fcheck-new -Idxsdk/DXSDK/Include -ld3d9 dxsdk/DXSDK/Lib/x86/d3dx9.lib

#!/bin/bash
rm tester.exe > /dev/null 2>&1
i586-mingw32msvc-g++ tester.cpp -o tester.exe -fcheck-new -Idxsdk/DXSDK/Include -ld3d9 dxsdk/DXSDK/Lib/x86/d3dx9.lib