我目前正在尝试学习3D，并且尝试在3D阵列上玩一些有趣的东西。我似乎无法理解为什么我的代码未呈现正确的多维数据集...我通过3D数组并分配随机状态（1次绘制，2次不绘制），我不知道为什么在这些状态下运行似乎只绘制了所有的多维数据集或没有绘制。
任何帮助表示赞赏，请原谅错误的代码。
编辑：（我添加了一个cout文件并修复了一些代码）
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <windows.h>
#include <time.h>
#include <SDL.h>
#include <GL/gl.h>
#include <GL/glu.h>
using namespace std;
float SCALE = 2;
int i;
int chunk[16][16][16];
int chunkSize = 16;
time_t seconds;
int seed = 0;
int colors;
void buildChunk();
void renderChunk();
void drawCube(float size,int x,int y,int z)
{
glBegin(GL_QUADS);
// front face
glColor3f(0,200,255);
glVertex3f(size/2*x,size/2+y,size/2+z);
glVertex3f(-size/2*x,size/2+y,size/2+z);
glVertex3f(-size/2*x,-size/2+y,size/2+z);
glVertex3f(size/2*x,-size/2+y,size/2+z);
// left face
glColor3f(0.0,1.0,0.0);
glVertex3f(-size/2*x,size/2+y,size/2+z);
glVertex3f(-size/2*x,-size/2+y,size/2+z);
glVertex3f(-size/2*x,-size/2+y,-size/2+z);
glVertex3f(-size/2*x,size/2+y,-size/2+z);
// back face
glColor3f(0.0,0.0,1.0);
glVertex3f(size/2*x,size/2+y,-size/2+z);
glVertex3f(-size/2*x,size/2+y,-size/2+z);
glVertex3f(-size/2*x,-size/2+y,-size/2+z);
glVertex3f(size/2*x,-size/2+y,-size/2+z);
// right face
glColor3f(1.0,1.0,0.0);
glVertex3f(size/2*x,size/2+y,size/2+z);
glVertex3f(size/2*x,-size/2+y,size/2+z);
glVertex3f(size/2*x,-size/2+y,-size/2+z);
glVertex3f(size/2*x,size/2+y,-size/2+z);
// top face
glColor3f(1.0,0.0,1.0);
glVertex3f(size/2*x,size/2+y,size/2+z);
glVertex3f(-size/2*x,size/2+y,size/2+z);
glVertex3f(-size/2*x,size/2+y,-size/2+z);
glVertex3f(size/2*x,size/2+y,-size/2+z);
// bottom face
glColor3f(0.0,1.0,1.0);
glVertex3f(size/2*x,-size/2+y,size/2+z);
glVertex3f(-size/2*x,-size/2+y,size/2+z);
glVertex3f(-size/2*x,-size/2+y,-size/2+z);
glVertex3f(size/2*x,-size/2+y,-size/2+z);
glEnd();
}
float angle = 0.0;
const int triangle = 1;
void init()
{
glClearColor(0.0,0.0,0.0,1.0); //background color and alpha
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45,640.0/480.0,1.0,500.0);
glMatrixMode(GL_MODELVIEW);
glEnable(GL_DEPTH_TEST);
buildChunk();
}
void render()
{
renderChunk();
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.0,0.0,-30.0);
glRotatef(angle,1.0,1.0,0.0); // angle, x-axis, y-axis, z-axis
}
int main(int argc, char** argv)
{
SDL_Init(SDL_INIT_EVERYTHING);
SDL_Surface *screen;
screen = SDL_SetVideoMode(640, 480, 8, SDL_SWSURFACE|SDL_OPENGL);
// screen = SDL_SetVideoMode(640, 480, 8, SDL_SWSURFACE|SDL_FULLSCREEN);
bool running = true;
const int FPS = 30;
Uint32 start;
SDL_Event event;
init();
while(running)
{
start = SDL_GetTicks();
while(SDL_PollEvent(&event))
{
switch(event.type)
{
case SDL_QUIT:
running = false;
break;
}
}
render();
SDL_GL_SwapBuffers();
angle += 0.5;
if(angle > 360)
angle -= 360;
if(1000/FPS > SDL_GetTicks()-start)
SDL_Delay(1000/FPS-(SDL_GetTicks()-start));
}
SDL_Quit();
return 0;
}
void buildChunk()
{
seconds = time (NULL);
seed = seconds;
srand(seed);
/* Seed the random number generator with the specified seed */
int x;
int y;
int z;
for(x=0; x < chunkSize; x++)
{
for(y=0; y < chunkSize; y++)
{
for(z=0; z < chunkSize; z++)
{
/* 50% chance for a cell to be alive */
if(rand() % 100 < 50)
{
chunk[x][y][z] = 1;
}
else
{
chunk[x][y][z] = 0;
}
cout<< "chunk[" << x << "][" << y << "][" << z << "] state: " << chunk[x][y][z]<<endl;
}
}
}
}
void renderChunk()
{
int x;
int y;
int z;
for(x=0; x < chunkSize; x++)
{
for(y=0; y < chunkSize; y++)
{
for(z=0; z < chunkSize; z++)
{
if(chunk[x][y][z] == 1)
{
drawCube(1,x,y,z);
}
}
}
}
}
最佳答案
请注意，所有glVertex3f调用的第一栏中都有一个“ *”符号。该值应为“ +”，以使顶点偏移x而不是按比例缩放。您可能还需要考虑按大小缩放每个多维数据集的大小。您将得到类似以下内容的结果：
float halfSize = size / 2;
float xSize = x *大小；
float ySize = y *大小；
float zSize = z * size;
//正面
glColor3f（0,200,255）;
glVertex3f（xsize + halfSize，ysize + halfSize，zsize + halfSize）;
glVertex3f（xsize-halfSize，ysize + halfSize，zsize + halfSize）;
glVertex3f（xsize-halfSize，ysize-halfSize，zsize + halfSize）;
glVertex3f（xsize + halfSize，ysize-halfSize，zsize + halfSize）;