立方體三維觀察-模型變換
阿新 • • 發佈：2020-12-10
實驗一：
分析：
三個圖形的原型如下所示（所有的操作都必須先放到stack中，glPushMatrix () 和 glPopMatrix()）：
1.以中心繪製原點，設定顏色為紅色，繪製單位立方體線框glutWireCube(1.0)
2.設定顏色為綠色， 設定線寬2.0 glLineWidth(2.0),講元立方體線框沿x軸正方向平移2.0這裡用到了平移函式glTranslatef(2.0f,0.0f,0.0f); 引數1 ：x軸 引數2 ：y軸 引數3 ： z軸
3.跟2 差不多就不寫了
// 提示：在合適的地方修改或新增程式碼 #include <GL/freeglut.h> #include<stdio.h> // 評測程式碼所用標頭檔案-開始 #include<opencv2/core/core.hpp> #include<opencv2/highgui/highgui.hpp> #include<opencv2/imgproc/imgproc.hpp> // 評測程式碼所用標頭檔案-結束 GLint winWidth = 400, winHeight =400 ; //設定初始化視窗大小 /*觀察座標系引數設定*/ GLfloat x0 = 0.0, yy = 0.0, z0 = 5.0; //設定觀察座標系原點 GLfloat xref = 0.0, yref = 0.0, zref = 0.0; //設定觀察座標系參考點（視點） GLfloat Vx = 0.0, Vy = 1.0, Vz = 0.0; //設定觀察座標系向上向量（y軸） /*觀察體引數設定 */ GLfloat xwMin = -1.0, ywMin = -1.0, xwMax = 1.0, ywMax = 1.0;//設定裁剪視窗座標範圍 GLfloat dnear = 1.5, dfar = 20.0; //設定遠、近裁剪面深度範圍 void init(void) { glClearColor(0.0, 0.0, 0.0, 0.0); } void display(void) { glClear(GL_COLOR_BUFFER_BIT); glLoadIdentity(); /*觀察變換*/ gluLookAt(x0, yy, z0, xref, yref, zref, Vx, Vy, Vz); //指定三維觀察引數 // 請在此新增你的程式碼 /********** Begin ********/ glPushMatrix(); glColor3f(1.0, 0.0, 0.0); glutWireCube(1.0); glPopMatrix(); glPushMatrix(); glColor3f(0.0, 1.0, 0.0); glLineWidth(2.0); glTranslatef(2.0f,0.0f,0.0f); glutWireCube(1.0); glPopMatrix(); glPushMatrix(); glColor3f(0.0, 0.0, 1.0); glLineWidth(2.0); glTranslatef(-2.0f,0.0f,0.0f); glutSolidCube(1.0); glPopMatrix(); /********** End **********/ glFlush(); } void reshape(GLint newWidth, GLint newHeight) { /*視口變換*/ glViewport(0, 0, newWidth, newHeight); //定義視口大小 /*投影變換*/ glMatrixMode(GL_PROJECTION); glLoadIdentity(); /*透視投影，設定透視觀察體*/ glFrustum(xwMin, xwMax, ywMin, ywMax, dnear, dfar); /*模型變換*/ glMatrixMode(GL_MODELVIEW); winWidth = newWidth; winHeight = newHeight; } int main(int argc, char* argv[]) { GLubyte* pPixelData = (GLubyte*)malloc(800 * 400 * 3);//分配記憶體 GLint viewport[4] = { 0 }; glutInit(&argc, argv); glutInitWindowPosition(100, 100); glutInitWindowSize( 400 , 400 ); //設定初始化視窗大小 glutCreateWindow("三維觀察"); init(); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoopEvent(); /*************以下為評測程式碼，與本次實驗內容無關，請勿修改**************/ glReadBuffer(GL_FRONT); glPixelStorei(GL_UNPACK_ALIGNMENT, 4); glGetIntegerv(GL_VIEWPORT, viewport); glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_RGB, GL_UNSIGNED_BYTE, pPixelData); cv::Mat img; std::vector<cv::Mat> imgPlanes; img.create(400, 400, CV_8UC3); cv::split(img, imgPlanes); for (int i = 0; i < 400; i++) { unsigned char* plane0Ptr = imgPlanes[0].ptr<unsigned char>(i); unsigned char* plane1Ptr = imgPlanes[1].ptr<unsigned char>(i); unsigned char* plane2Ptr = imgPlanes[2].ptr<unsigned char>(i); for (int j = 0; j < 400; j++) { int k = 3 * (i * 400 + j); plane2Ptr[j] = pPixelData[k]; plane1Ptr[j] = pPixelData[k + 1]; plane0Ptr[j] = pPixelData[k + 2]; } } cv::merge(imgPlanes, img); cv::flip(img, img, 0); cv::namedWindow("openglGrab"); cv::imshow("openglGrab", img); //cv::waitKey(); cv::imwrite("../img_step1/test.jpg", img); return 0; }
視點改為（1.0,1.5,8.0)，觀察中心改為在(0, 0 ,0)，向上向量改為(0, 1, 0)；
實驗二：code；
// 提示：在合適的地方修改或新增程式碼 #include <GL/freeglut.h> #include<stdio.h> // 評測程式碼所用標頭檔案-開始 #include<opencv2/core/core.hpp> #include<opencv2/highgui/highgui.hpp> #include<opencv2/imgproc/imgproc.hpp> // 評測程式碼所用標頭檔案-結束 GLint winWidth = 400, winHeight =400 ; //設定初始化視窗大小 /*觀察座標系引數設定*/ GLfloat x0 = 1.0, yy = 1.5, z0 = 8.0; //設定觀察座標系原點 GLfloat xref = 0.0, yref = 0.0, zref = 0.0; //設定觀察座標系參考點（視點） GLfloat Vx = 0.0, Vy = 1.0, Vz = 0.0; //設定觀察座標系向上向量（y軸） /*觀察體引數設定 */ GLfloat xwMin = -1.0, ywMin = -1.0, xwMax = 1.0, ywMax = 1.0;//設定裁剪視窗座標範圍 GLfloat dnear = 1.5, dfar = 20.0; //設定遠、近裁剪面深度範圍 void init(void) { glClearColor(0.0, 0.0, 0.0, 0.0); } void display(void) { glClear(GL_COLOR_BUFFER_BIT); glLoadIdentity(); /*觀察變換*/ gluLookAt(x0, yy, z0, xref, yref, zref, Vx, Vy, Vz); //指定三維觀察引數 // 請在此新增你的程式碼 /********** Begin ********/ glPushMatrix(); glColor3f(1.0, 0.0, 0.0); glutWireCube(1.0); glPopMatrix(); glPushMatrix(); glColor3f(0.0, 1.0, 0.0); glLineWidth(2.0); glTranslatef(2.0f,0.0f,0.0f); glutWireCube(1.0); glPopMatrix(); glPushMatrix(); glColor3f(0.0, 0.0, 1.0); glLineWidth(2.0); glTranslatef(-2.0f,0.0f,0.0f); glutSolidCube(1.0); glPopMatrix(); /********** End **********/ glFlush(); } void reshape(GLint newWidth, GLint newHeight) { /*視口變換*/ glViewport(0, 0, newWidth, newHeight); //定義視口大小 /*投影變換*/ glMatrixMode(GL_PROJECTION); glLoadIdentity(); /*透視投影，設定透視觀察體*/ gluPerspective( 45, 1, 1, 100); /*模型變換*/ glMatrixMode(GL_MODELVIEW); winWidth = newWidth; winHeight = newHeight; } int main(int argc, char* argv[]) { GLubyte* pPixelData = (GLubyte*)malloc(800 * 400 * 3);//分配記憶體 GLint viewport[4] = { 0 }; glutInit(&argc, argv); glutInitWindowPosition(100, 100); glutInitWindowSize( 400 , 400 ); //設定初始化視窗大小 glutCreateWindow("三維觀察"); init(); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoopEvent(); /*************以下為評測程式碼，與本次實驗內容無關，請勿修改**************/ glReadBuffer(GL_FRONT); glPixelStorei(GL_UNPACK_ALIGNMENT, 4); glGetIntegerv(GL_VIEWPORT, viewport); glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_RGB, GL_UNSIGNED_BYTE, pPixelData); cv::Mat img; std::vector<cv::Mat> imgPlanes; img.create(400, 400, CV_8UC3); cv::split(img, imgPlanes); for (int i = 0; i < 400; i++) { unsigned char* plane0Ptr = imgPlanes[0].ptr<unsigned char>(i); unsigned char* plane1Ptr = imgPlanes[1].ptr<unsigned char>(i); unsigned char* plane2Ptr = imgPlanes[2].ptr<unsigned char>(i); for (int j = 0; j < 400; j++) { int k = 3 * (i * 400 + j); plane2Ptr[j] = pPixelData[k]; plane1Ptr[j] = pPixelData[k + 1]; plane0Ptr[j] = pPixelData[k + 2]; } } cv::merge(imgPlanes, img); cv::flip(img, img, 0); cv::namedWindow("openglGrab"); cv::imshow("openglGrab", img); //cv::waitKey(); cv::imwrite("../img_step2/test.jpg", img); return 0; }
實驗三：
code：
// 提示：在合適的地方修改或新增程式碼 #include <GL/freeglut.h> #include<stdio.h> // 評測程式碼所用標頭檔案-開始 #include<opencv2/core/core.hpp> #include<opencv2/highgui/highgui.hpp> #include<opencv2/imgproc/imgproc.hpp> // 評測程式碼所用標頭檔案-結束 GLint winWidth = 400, winHeight =400 ; //設定初始化視窗大小 /*觀察座標系引數設定*/ GLfloat x0 = 0.0, yy = 0.0, z0 = 5.0; //設定觀察座標系原點 GLfloat xref = 0.0, yref = 0.0, zref = 0.0; //設定觀察座標系參考點（視點） GLfloat Vx = 0.0, Vy = 1.0, Vz = 0.0; //設定觀察座標系向上向量（y軸） /*觀察體引數設定 */ GLfloat xwMin = -1.0, ywMin = -1.0, xwMax = 1.0, ywMax = 1.0;//設定裁剪視窗座標範圍 GLfloat dnear = 1.5, dfar = 20.0; //設定遠、近裁剪面深度範圍 void init(void) { glClearColor(0.0, 0.0, 0.0, 0.0); } void display(void) { glClear(GL_COLOR_BUFFER_BIT); glLoadIdentity(); /*觀察變換*/ gluLookAt(x0, yy, z0, xref, yref, zref, Vx, Vy, Vz); //指定三維觀察引數 // 請在此新增你的程式碼 /********** Begin ********/ glPushMatrix(); glColor3f(1.0, 0.0, 0.0); glutWireCube(1.0); glPopMatrix(); glPushMatrix(); glColor3f(0.0, 1.0, 0.0); glLineWidth(2.0); glTranslatef(2.0f,0.0f,0.0f); glRotatef(-30.0f,1.0f,0.0f,0.0f); glutWireCube(1.0); glPopMatrix(); glPushMatrix(); glColor3f(0.0, 0.0, 1.0); // glLineWidth(2.0); glTranslatef(-2.0f,0.0f,0.0f); glutSolidCube(1.0); glPopMatrix(); /********** End **********/ glFlush(); } void reshape(GLint newWidth, GLint newHeight) { /*視口變換*/ glViewport(0, 0, newWidth, newHeight); //定義視口大小 /*投影變換*/ glMatrixMode(GL_PROJECTION); glLoadIdentity(); /*透視投影，設定透視觀察體*/ glFrustum(xwMin, xwMax, ywMin, ywMax, dnear, dfar); /*模型變換*/ glMatrixMode(GL_MODELVIEW); winWidth = newWidth; winHeight = newHeight; } int main(int argc, char* argv[]) { GLubyte* pPixelData = (GLubyte*)malloc(800 * 400 * 3);//分配記憶體 GLint viewport[4] = { 0 }; glutInit(&argc, argv); glutInitWindowPosition(100, 100); glutInitWindowSize( 400 , 400 ); //設定初始化視窗大小 glutCreateWindow("三維觀察"); init(); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoopEvent(); /*************以下為評測程式碼，與本次實驗內容無關，請勿修改**************/ glReadBuffer(GL_FRONT); glPixelStorei(GL_UNPACK_ALIGNMENT, 4); glGetIntegerv(GL_VIEWPORT, viewport); glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_RGB, GL_UNSIGNED_BYTE, pPixelData); cv::Mat img; std::vector<cv::Mat> imgPlanes; img.create(400, 400, CV_8UC3); cv::split(img, imgPlanes); for (int i = 0; i < 400; i++) { unsigned char* plane0Ptr = imgPlanes[0].ptr<unsigned char>(i); unsigned char* plane1Ptr = imgPlanes[1].ptr<unsigned char>(i); unsigned char* plane2Ptr = imgPlanes[2].ptr<unsigned char>(i); for (int j = 0; j < 400; j++) { int k = 3 * (i * 400 + j); plane2Ptr[j] = pPixelData[k]; plane1Ptr[j] = pPixelData[k + 1]; plane0Ptr[j] = pPixelData[k + 2]; } } cv::merge(imgPlanes, img); cv::flip(img, img, 0); cv::namedWindow("openglGrab"); cv::imshow("openglGrab", img); //cv::waitKey(); cv::imwrite("../img_step4/test.jpg", img); return 0; }
實驗四：
code：
// 提示：在合適的地方修改或新增程式碼
#include <GL/freeglut.h>
#include<stdio.h>
// 評測程式碼所用標頭檔案-開始
#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
// 評測程式碼所用標頭檔案-結束
GLint winWidth = 400, winHeight =400 ; //設定初始化視窗大小
/*觀察座標系引數設定*/
GLfloat x0 = 0.0, yy = 0.0, z0 = 5.0; //設定觀察座標系原點
GLfloat xref = 0.0, yref = 0.0, zref = 0.0; //設定觀察座標系參考點（視點）
GLfloat Vx = 0.0, Vy = 1.0, Vz = 0.0; //設定觀察座標系向上向量（y軸）
/*觀察體引數設定 */
GLfloat xwMin = -1.0, ywMin = -1.0, xwMax = 1.0, ywMax = 1.0;//設定裁剪視窗座標範圍
GLfloat dnear = 1.5, dfar = 20.0; //設定遠、近裁剪面深度範圍
void init(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
/*觀察變換*/
gluLookAt(x0, yy, z0, xref, yref, zref, Vx, Vy, Vz); //指定三維觀察引數
// 請在此新增你的程式碼
/********** Begin ********/
glPushMatrix();
glColor3f(1.0, 0.0, 0.0);
glutWireCube(1.0);
glPopMatrix();
glPushMatrix();
glColor3f(0.0, 1.0, 0.0);
glLineWidth(2.0);
glTranslatef(2.0f,0.0f,0.0f);
// glRotatef(-30.0f,1.0f,0.0f,0.0f);
glutWireCube(1.0);
glPopMatrix();
glPushMatrix();
glColor3f(0.0, 0.0, 1.0);
// glLineWidth(2.0);
glTranslatef(-2.0f,0.0f,0.0f);
glutSolidCube(1.0);
glPopMatrix();
/********** End **********/
glFlush();
}
void reshape(GLint newWidth, GLint newHeight)
{
/*視口變換*/
glViewport(0, 0, newWidth, newHeight); //定義視口大小
/*投影變換*/
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
/*平行投影*/
glOrtho(-3.0 ,3.0 ,-3.0 ,3.0 ,-100.0 ,100.0 );
/*模型變換*/
glMatrixMode(GL_MODELVIEW);
winWidth = newWidth;
winHeight = newHeight;
}
int main(int argc, char* argv[])
{
GLubyte* pPixelData = (GLubyte*)malloc(800 * 400 * 3);//分配記憶體
GLint viewport[4] = { 0 };
glutInit(&argc, argv);
glutInitWindowPosition(100, 100);
glutInitWindowSize( 400 , 400 ); //設定初始化視窗大小
glutCreateWindow("三維觀察");
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoopEvent();
/*************以下為評測程式碼，與本次實驗內容無關，請勿修改**************/
glReadBuffer(GL_FRONT);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glGetIntegerv(GL_VIEWPORT, viewport);
glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_RGB, GL_UNSIGNED_BYTE, pPixelData);
cv::Mat img;
std::vector<cv::Mat> imgPlanes;
img.create(400, 400, CV_8UC3);
cv::split(img, imgPlanes);
for (int i = 0; i < 400; i++) {
unsigned char* plane0Ptr = imgPlanes[0].ptr<unsigned char>(i);
unsigned char* plane1Ptr = imgPlanes[1].ptr<unsigned char>(i);
unsigned char* plane2Ptr = imgPlanes[2].ptr<unsigned char>(i);
for (int j = 0; j < 400; j++) {
int k = 3 * (i * 400 + j);
plane2Ptr[j] = pPixelData[k];
plane1Ptr[j] = pPixelData[k + 1];
plane0Ptr[j] = pPixelData[k + 2];
}
}
cv::merge(imgPlanes, img);
cv::flip(img, img, 0);
cv::namedWindow("openglGrab");
cv::imshow("openglGrab", img);
//cv::waitKey();
cv::imwrite("../img_step3/test.jpg", img);
return 0;
}實驗五：
code；
// 提示：在合適的地方修改或新增程式碼
#include <GL/freeglut.h>
#include<stdio.h>
// 評測程式碼所用標頭檔案-開始
#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
// 評測程式碼所用標頭檔案-結束
GLint winWidth = 800, winHeight = 400; //設定初始化視窗大小
/*觀察座標系引數設定*/
GLfloat x0 = 0.0, yy = 0.0, z0 = 5.0; //設定觀察座標系原點
GLfloat xref = 0.0, yref = 0.0, zref = 0.0; //設定觀察座標系參考點（視點）
GLfloat Vx = 0.0, Vy = 1.0, Vz = 0.0; //設定觀察座標系向上向量（y軸）
/*觀察體引數設定 */
GLfloat xwMin = -1.0, ywMin = -1.0, xwMax = 1.0, ywMax = 1.0;//設定裁剪視窗座標範圍
GLfloat dnear = 1.5, dfar = 20.0; //設定遠、近裁剪面深度範圍
void init(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
/*觀察變換*/
gluLookAt(x0, yy, z0, xref, yref, zref, Vx, Vy, Vz); //指定三維觀察引數
// 請在此新增你的程式碼
/********** Begin ********/
glPushMatrix();
glColor3f(1.0, 0.0, 0.0);
glutWireCube(1.0);
glPopMatrix();
glPushMatrix();
glColor3f(0.0, 1.0, 0.0);
glLineWidth(2.0);
glTranslatef(2.0f,0.0f,0.0f);
// glRotatef(-30.0f,1.0f,0.0f,0.0f);
glutWireCube(1.0);
glPopMatrix();
glPushMatrix();
glColor3f(0.0, 0.0, 1.0);
// glLineWidth(2.0);
glTranslatef(-2.0f,0.0f,0.0f);
glutSolidCube(1.0);
glPopMatrix();
/********** End **********/
glFlush();
}
void reshape(GLint newWidth, GLint newHeight)
{
/*視口變換*/
glViewport(0, 0, newWidth, newHeight); //定義視口大小
/*投影變換*/
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
/*透視投影，設定透視觀察體*/
gluPerspective( 45, 2, 1, 100);
/*模型變換*/
glMatrixMode(GL_MODELVIEW);
winWidth = newWidth;
winHeight = newHeight;
}
int main(int argc, char* argv[])
{
GLubyte* pPixelData = (GLubyte*)malloc(800 * 400 * 3);//分配記憶體
GLint viewport[4] = { 0 };
glutInit(&argc, argv);
glutInitWindowPosition(100, 100);
glutInitWindowSize( winWidth , winHeight ); //設定初始化視窗大小
glutCreateWindow("三維觀察");
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoopEvent();
/*************以下為評測程式碼，與本次實驗內容無關，請勿修改**************/
glReadBuffer(GL_FRONT);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glGetIntegerv(GL_VIEWPORT, viewport);
glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_RGB, GL_UNSIGNED_BYTE, pPixelData);
cv::Mat img;
std::vector<cv::Mat> imgPlanes;
img.create(400, 800, CV_8UC3);
cv::split(img, imgPlanes);
for (int i = 0; i < 400; i++) {
unsigned char* plane0Ptr = imgPlanes[0].ptr<unsigned char>(i);
unsigned char* plane1Ptr = imgPlanes[1].ptr<unsigned char>(i);
unsigned char* plane2Ptr = imgPlanes[2].ptr<unsigned char>(i);
for (int j = 0; j < 800; j++) {
int k = 3 * (i * 800 + j);
plane2Ptr[j] = pPixelData[k];
plane1Ptr[j] = pPixelData[k + 1];
plane0Ptr[j] = pPixelData[k + 2];
}
}
cv::merge(imgPlanes, img);
cv::flip(img, img, 0);
cv::namedWindow("openglGrab");
cv::imshow("openglGrab", img);
//cv::waitKey();
cv::imwrite("../img_step5/test.jpg", img);
return 0;
}