Aight所以，我正在制作一个简单的地形程序，而不是一个游戏，但嘿，也许有一天。我将首先描述我的程序如何工作的基础知识。我正在使用二维数组来存储构成三角形网格的顶点的坐标。 x和z值在以下代码中分配：
//Sets up the array for the vertexes
int e = 0;
int p = 0;
for (int r = 0; r < 10; r++) {
for (int x = 0; x < 5; x++) {
grid[p][0] = x * 2;
grid[p][2] = e;
p++;
}
e += 2;
}
好的，所以网格数组是我用来存储程序中所有顶点值的那个，第一个参数（第一组[]中的值）用于选择一个点，第二个参数[]是x，y和z值，上面的代码片段仅设置x和z坐标的值。 y值，height，在程序开始时使用以下代码随机化：
//Random heights for the terrain
if (fir == true) {
for (int h = 0; h < 64; h++) {
grid[h][1] = rand() % 3;
}
fir = false;
}
绘制三角形的代码：
for (int q = 0; q < 11; q++) {
a = q * 5;
b = a + 1;
c = a + 5;
glBegin(GL_TRIANGLE_STRIP);
for (int dw = 0; dw < 8; dw++) {
//a
glColor3f(grid[a][1], grid[a][1], grid[a][1]);
glVertex3f(grid[a][0], grid[a][1], grid[a][2]);
//b
glColor3f(grid[b][1], grid[b][1], grid[b][1]);
glVertex3f(grid[b][0], grid[b][1], grid[b][2]);
//c
glColor3f(1, 0, 0);
glVertex3f(grid[c][0], grid[c][1], grid[c][2]);
a = c;
t = b;
b = a + 1;
c = t;
}
glEnd();
}
glutSwapBuffers();
}
我遇到的问题是，如果没有程序破坏，我无法使网格的大小更大，我希望能够将三角形网格的大小更改为我喜欢的任何内容。当我尝试更改通过x值（第一个代码片段）的for循环时程序中断，我的移动速度急剧增加，移动鼠标对相机旋转没有影响。当我设法找到一组值来工作时，三角形网格搞砸了，第五行之后的任何点都被设置为0，我将发布整个程序，我不知道它是否会运行每个人，但我认为问题是需要整个程序才能解决的问题。 我认为问题可能是由于变量被程序的不同部分共享，我看起来和看起来但似乎找不到任何原因。这是我解决这个问题噩梦的最后手段......
/*
*/
#include <iostream>
#include <glut.h>
#include <gl\GL.h>
#define _USE_MATH_DEFINES
#include <math.h>
#include <cstdlib>
#include "vector3f.h"
using namespace std;
//Variables
const int WINDOW_WIDTH = 1280;
const int WINDOW_HEIGHT = 720;
const char* WINDOW_TITLE = "Terrain";
const float WALKING_SPEED = 5.0;
const float MOUSE_SENSITIVITY = 0.3;
const float MAX_TILT = 90.0;
float grid[200][3];
float LAST_TIME;
float CURRENT_TIME;
float DELTA_TIME;
bool KEY[256];
int a;
int b;
int c;
int t;
int MOUSE_LAST_X;
int MOUSE_LAST_Y;
int MOUSE_CURRENT_X;
int MOUSE_CURRENT_Y;
int MOUSE_DELTA_X;
int MOUSE_DELTA_Y;
float red;
float green;
float blue;
bool fir = true;
//Object
vector3f CAMERA_POSITION;
vector3f CAMERA_ROTATION;
//Functions
void initialize();
void display();
void reshape(int w, int h);
void keyboardDown(unsigned char key, int x, int y);
void keyboardUp(unsigned char key, int x, int y);
void mouseMove(int x, int y);
void movement();
double degreesToRadians(double degrees);
double dsin(double theta);
double dcos(double theta);
double dtan(double theta);
void display() {
//cout << KEY[' '] << endl;
movement();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
//Camera transformations
glRotatef(CAMERA_ROTATION.x, 1, 0, 0);
glRotatef(CAMERA_ROTATION.y, 0, 1, 0);
glRotatef(CAMERA_ROTATION.z, 0, 0, 1);
glTranslatef(-CAMERA_POSITION.x, -CAMERA_POSITION.y, CAMERA_POSITION.z);
//Draw the basic triangle
glBegin(GL_TRIANGLES);
glColor3f(0.0, 0.0, 1.0);
glVertex3f(-1.0, -1.0, -3.0);
glColor3f(0.0, 1.0, 0.0);
glVertex3f(0.0, 1.0, -3.0);
glColor3f(1.0, 0.0, 0.0);
glVertex3f(10.0, -1.0, -3.0);
glEnd();
/*
1 0,0,0
2 2,0,0
3 4,0,0
4 6,0,0
5 0,0,2
6 2,0,2
7 4,0,2
8 6,0,2
9 0,0,4
10 2,0,4
11 4,0,4
12 6,0,4
13 0,0,6
14 2,0,6
15 4,0,6
16 6,0,6
*/
/*//Option 1 (2 for loops, four if statements)
for (int p = 0; p < 16; p++) {
for (int x = 0; x < 7; x += 2) {
grid[p][0] = x;
}
grid[p][1] = 0;
if (p < 4) {
grid[p][2] = 0;
}
if (p < 8 && p >= 4) {
grid[p][2] = 2;
}
if (p < 12 && p >= 8) {
grid[p][2] = 4;
}
if (p < 16 && p >= 12) {
grid[p][2] = 6;
}
}
*/
//Option 2 (three for loops)
//Sets up the array for the vertexes
int e = 0;
int p = 0;
for (int r = 0; r < 10; r++) {
for (int x = 0; x < 5; x++) {
grid[p][0] = x * 2;
grid[p][2] = e;
p++;
}
e += 2;
}
//Random heights for the terrain
if (fir == true) {
for (int h = 0; h < 64; h++) {
grid[h][1] = rand() % 3;
}
fir = false;
}
//cout << "point 0: " << grid[0][0] << ", " << grid[0][1] << ", " << grid[0][2] << endl;
//cout << "point 1: " << grid[1][0] << ", " << grid[1][1] << ", " << grid[1][2] << endl;
//cout << "point 2: " << grid[2][0] << ", " << grid[2][1] << ", " << grid[2][2] << endl;
//cout << "point 3: " << grid[3][0] << ", " << grid[3][1] << ", " << grid[3][2] << endl;
//cout << "point 4: " << grid[4][0] << ", " << grid[4][1] << ", " << grid[4][2] << endl;
//cout << "point 5: " << grid[5][0] << ", " << grid[5][1] << ", " << grid[5][2] << endl;
//cout << "point 6: " << grid[6][0] << ", " << grid[6][1] << ", " << grid[6][2] << endl;
//cout << "point 7: " << grid[7][0] << ", " << grid[7][1] << ", " << grid[7][2] << endl;
//cout << "point 8: " << grid[8][0] << ", " << grid[8][1] << ", " << grid[8][2] << endl;
//cout << "point 9: " << grid[9][0] << ", " << grid[9][1] << ", " << grid[9][2] << endl;
//cout << "point 10: " << grid[10][0] << ", " << grid[10][1] << ", " << grid[10][2] << endl;
//cout << "point 11: " << grid[11][0] << ", " << grid[11][1] << ", " << grid[11][2] << endl;
//cout << "point 12: " << grid[12][0] << ", " << grid[12][1] << ", " << grid[12][2] << endl;
//cout << "point 13: " << grid[13][0] << ", " << grid[13][1] << ", " << grid[13][2] << endl;
//cout << "point 14: " << grid[14][0] << ", " << grid[14][1] << ", " << grid[14][2] << endl;
//cout << "point 15: " << grid[15][0] << ", " << grid[15][1] << ", " << grid[15][2] << endl;
for (int q = 0; q < 11; q++) {
a = q * 5;
b = a + 1;
c = a + 5;
glBegin(GL_TRIANGLE_STRIP);
for (int dw = 0; dw < 8; dw++) {
//a
glColor3f(grid[a][1], grid[a][1], grid[a][1]);
glVertex3f(grid[a][0], grid[a][1], grid[a][2]);
//b
glColor3f(grid[b][1], grid[b][1], grid[b][1]);
glVertex3f(grid[b][0], grid[b][1], grid[b][2]);
//c
glColor3f(1, 0, 0);
glVertex3f(grid[c][0], grid[c][1], grid[c][2]);
a = c;
t = b;
b = a + 1;
c = t;
}
glEnd();
}
glutSwapBuffers();
}
void keyboardDown(unsigned char key, int x, int y) {
KEY[key] = true;
}
void keyboardUp(unsigned char key, int x, int y) {
KEY[key] = false;
}
void movement() {
CURRENT_TIME = ((float)glutGet(GLUT_ELAPSED_TIME) / 1000);
DELTA_TIME = CURRENT_TIME - LAST_TIME;
LAST_TIME = CURRENT_TIME;
MOUSE_DELTA_X = MOUSE_CURRENT_X - MOUSE_LAST_X;
MOUSE_DELTA_Y = MOUSE_CURRENT_Y - MOUSE_LAST_Y;
MOUSE_LAST_X = MOUSE_CURRENT_X;
MOUSE_LAST_Y = MOUSE_CURRENT_Y;
CAMERA_ROTATION.y += (float)MOUSE_DELTA_X * MOUSE_SENSITIVITY;
CAMERA_ROTATION.x += (float)MOUSE_DELTA_Y * MOUSE_SENSITIVITY;
if (CAMERA_ROTATION.x > MAX_TILT) {
CAMERA_ROTATION.x = MAX_TILT;
}
if (CAMERA_ROTATION.x < -MAX_TILT) {
CAMERA_ROTATION.x = -MAX_TILT;
}
if (KEY['w'] == true) {
CAMERA_POSITION.x += (WALKING_SPEED * DELTA_TIME) * dsin(CAMERA_ROTATION.y);
CAMERA_POSITION.z += (WALKING_SPEED * DELTA_TIME) * dcos(CAMERA_ROTATION.y);
CAMERA_POSITION.y += (WALKING_SPEED * DELTA_TIME) * dsin(CAMERA_ROTATION.x + 180);
}
if (KEY['s'] == true) {
CAMERA_POSITION.x += (WALKING_SPEED * DELTA_TIME) * dsin(CAMERA_ROTATION.y + 180);
CAMERA_POSITION.z += (WALKING_SPEED * DELTA_TIME) * dcos(CAMERA_ROTATION.y + 180);
CAMERA_POSITION.y += (WALKING_SPEED * DELTA_TIME) * dsin(CAMERA_ROTATION.x);
}
if (KEY['a'] == true) {
CAMERA_POSITION.x += (WALKING_SPEED * DELTA_TIME) * dsin(CAMERA_ROTATION.y + 270);
CAMERA_POSITION.z += (WALKING_SPEED * DELTA_TIME) * dcos(CAMERA_ROTATION.y + 270);
}
if (KEY['d'] == true) {
CAMERA_POSITION.x += (WALKING_SPEED * DELTA_TIME) * dsin(CAMERA_ROTATION.y + 90);
CAMERA_POSITION.z += (WALKING_SPEED * DELTA_TIME) * dcos(CAMERA_ROTATION.y + 90);
}
if (KEY[' '] == true) {
CAMERA_POSITION.y += (WALKING_SPEED * DELTA_TIME);
}
if (KEY['e'] == true) {
exit(1);
}
}
void mouseMove(int x, int y) {
MOUSE_CURRENT_X = x;
MOUSE_CURRENT_Y = y;
}
double degreesToRadians(double degrees){
return degrees * M_PI / 180;
}
double dsin(double theta) {
return sin(degreesToRadians(theta));
}
double dcos(double theta) {
return cos(degreesToRadians(theta));
}
double dtan(double theta) {
return tan(degreesToRadians(theta));
}
void reshape(int w, int h) {
//Stops the ratio from dividing by 0
if (h == 0) {
h = 1;
}
float fRatio = (float)w / h;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glViewport(0, 0, w, h);
gluPerspective(60, fRatio, 0.1, 1000);
glMatrixMode(GL_MODELVIEW);
}
void initialize() {
glClearColor(0.0, 0.0, 102.0 / 255.0, 0.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
}
int main(int iArgc, char** cArgv) {
//Initialise OpenGL and GLUT
glutInit(&iArgc, cArgv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
//Setup window
glutInitWindowPosition(0, 0);
glutInitWindowSize(WINDOW_WIDTH, WINDOW_HEIGHT);
glutCreateWindow(WINDOW_TITLE);
//Setup GLUT callback functions
initialize();
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutIdleFunc(display);
glutKeyboardFunc(keyboardDown);
glutKeyboardUpFunc(keyboardUp);
glutMotionFunc(mouseMove);
glutPassiveMotionFunc(mouseMove);
glEnable(GL_DEPTH_TEST);
//Enter main loop
glutMainLoop();
return 0;
}
答案 0 :(得分：0)
一些快速评论：
你的循环访问不同数量的点！
第一个循环（r，x）初始化50个点
第二循环（h）初始化64点
第3循环（q，dw）访问59分
glColor3f值应介于0和1之间，但使用网格y值，可获得0,1或2
在尝试旋转视图时要小心gimbal lock problem！