实验04_纹理映射.doc

计算机图形学实验报告04

北方工业大学

计算机图形学课程实验报告

题 目：
实验04_纹理映射
学 院：
计算机学院
专 业：
数字媒体技术
指导教师：
蔡兴泉
学生班级：
数媒13-2
学生学号：
13101090212
学生姓名：
常乐

教师评定：

1

计算机图形学实验报告03

学号：
13101090212
班级：
数媒13-2
姓名：
常乐

实验报告4 纹理映射
一．实验目的
1．熟悉OpenGL图形库；
2．掌握纹理映射实现方法。
二．实验环境
1．软件环境：
操作系统：WinXp
应用软件：VC6.0，OpenGL
2．硬件环境（查看自己的机子）
CPU: Intel PIV 2.80GHz
内存RAM: 1GB
显卡：NVIDIA GeForce7650，256M显存
三．实验内容1
实现简单纹理映射。三维空间中画一个三角形，贴纹理。纹理图自己从网上下载
给出源程序及效果截图。
void RenderScene(void)
{
GLTVector3 vNormal;
GLTVector3 vCorners[5] = { { 0.0f, .80f, 0.0f }, // Top 0
{ -0.5f, 0.0f, -.50f }, // Back left 1
{ 0.5f, 0.0f, -0.50f }, // Back right 2
{ 0.5f, 0.0f, 0.5f }, // Front right 3
{ -0.5f, 0.0f, 0.5f }}; // Front left 4

// Clear the window with current clearing color
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

// Save the matrix state and do the rotations
glPushMatrix();
// Move object back and do in place rotation
glTranslatef(0.0f, -0.25f, -4.0f);
glRotatef(xRot, 1.0f, 0.0f, 0.0f);
glRotatef(yRot, 0.0f, 1.0f, 0.0f);

// Draw the Pyramid
glColor3f(1.0f, 1.0f, 1.0f);
glBegin(GL_TRIANGLES);
// Bottom section - two triangles
glNormal3f(0.0f, -1.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex3fv(vCorners[2]);

glTexCoord2f(0.0f, 0.0f);
glVertex3fv(vCorners[4]);

glTexCoord2f(0.0f, 1.0f);
glVertex3fv(vCorners[1]);

glTexCoord2f(1.0f, 1.0f);
glVertex3fv(vCorners[2]);

glTexCoord2f(1.0f, 0.0f);
glVertex3fv(vCorners[3]);

glTexCoord2f(0.0f, 0.0f);
glVertex3fv(vCorners[4]);

// Front Face
gltGetNormalVector(vCorners[0], vCorners[4], vCorners[3], vNormal);
glNormal3fv(vNormal);
glTexCoord2f(0.5f, 1.0f);
glVertex3fv(vCorners[0]);
glTexCoord2f(0.0f, 0.0f);
glVertex3fv(vCorners[4]);
glTexCoord2f(1.0f, 0.0f);
glVertex3fv(vCorners[3]);

// Left Face
gltGetNormalVector(vCorners[0], vCorners[1], vCorners[4], vNormal);
glNormal3fv(vNormal);
glTexCoord2f(0.5f, 1.0f);
glVertex3fv(vCorners[0]);

glTexCoord2f(0.0f, 0.0f);
glVertex3fv(vCorners[1]);
glTexCoord2f(1.0f, 0.0f);
glVertex3fv(vCorners[4]);

// Back Face
gltGetNormalVector(vCorners[0], vCorners[2], vCorners[1], vNormal);
glNormal3fv(vNormal);

glTexCoord2f(0.5f, 1.0f);
glVertex3fv(vCorners[0]);

glTexCoord2f(0.0f, 0.0f);
glVertex3fv(vCorners[2]);

glTexCoord2f(1.0f, 0.0f);
glVertex3fv(vCorners[1]);

// Right Face
gltGetNormalVector(vCorners[0], vCorners[3], vCorners[2], vNormal);
glNormal3fv(vNormal);
glTexCoord2f(0.5f, 1.0f);
glVertex3fv(vCorners[0]);
glTexCoord2f(0.0f, 0.0f);
glVertex3fv(vCorners[3]);
glTexCoord2f1.0f, 0.0f);
glVertex3fv(vCorners[2]);
glEnd();

// Restore the matrix state
glPopMatrix();

// Buffer swap
glutSwapBuffers();
}

四．实验内容2
实现简单纹理映射。三维空间中画一个立方体，六个面贴同一张纹理。纹理图自己从网上下载。
给出源程序及效果截图。

int DrawGLScene(GLvoid) // Here's Where We Do All The Drawing
{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
glLoadIdentity(); // Reset The View
glTranslatef(0.0f,0.0f,z);

glRotatef(xrot,1.0f,0.0f,0.0f);
glRotatef(yrot,0.0f,1.0f,0.0f);
GLint texture[6]; //
glGenTextures(6,&texture[0]); //

// glBindTexture(GL_TEXTURE_2D, texture[filter]);

glBegin(GL_QUADS);
// Front Face
glBindTexture(GL_TEXTURE_2D, texture[0]);//
glNormal3f( 0.0f, 0.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
// Back Face
glNormal3f( 0.0f, 0.0f,-1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
// Top Face
glNormal3f( 0.0f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
// Bottom Face
glNormal3f( 0.0f,-1.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
// Right face
glNormal3f( 1.0f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
// Left Face
glNormal3f(-1.0f, 0.0f, 0.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();

xrot+=xspeed;
yrot+=yspeed;
return TRUE; // Keep Going
}
五．实验内容3
采用纹理对象法，三维空间中画一个立方体，六个面贴不同纹理。纹理图自己从网上下载。
给出源程序及效果截图。
int LoadGLTextures()
{
int Status = 0;
char *bmpFile[6] = {"BmpFile/Ferrary.bmp","BmpFile/Honda.bmp","BmpFile/Hust.bmp",
"BmpFile/Lamborghini.bmp","BmpFile/NeHe.bmp","BmpFile/Porsche.bmp"};
for (int i = 0;i < 6;++i)
{
texture[i] = SOIL_load_OGL_texture(
bmpFile[i],
SOIL_LOAD_AUTO,
SOIL_CREATE_NEW_ID,
SOIL_FLAG_INVERT_Y);
printf("texture[%d]: %d\n",i,texture[i]);
if(texture[i] == 0)
Status = 0;
glBindTexture(GL_TEXTURE_2D,texture[i]);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
}

return Status;
}

void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.0f,0.0f,-5.0f);
glRotatef(xRot,1.0f,0.0f,0.0f);
glRotatef(yRot,0.0f,1.0f,0.0f);
glRotatef(zRot,0.0f,0.0f,1.0f);

//glRotatef(45,1.0f,0.0f,0.0f);
//glRotatef(45,0.0f,1.0f,0.0f);

glBindTexture(GL_TEXTURE_2D,texture[0]);

glBegin(GL_QUADS);
// Front Face
// Bottom Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
// Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
// Top Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
// Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glEnd();

glBindTexture(GL_TEXTURE_2D,texture[1]);
glBegin(GL_QUADS);
// Back Face
// Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
// Top Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
// Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
// Bottom Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glEnd();

glBindTexture(GL_TEXTURE_2D,texture[2]);
glBegin(GL_QUADS);
// Top Face
// Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
// Bottom Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
// Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
// Top Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glEnd();

glBindTexture(GL_TEXTURE_2D,texture[3]);
glBegin(GL_QUADS);
// Bottom Face
// Top Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
// Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f -1.0f, -1.0f);
// Bottom Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
// Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glEnd();

glBindTexture(GL_TEXTURE_2D,texture[4]);
glBegin(GL_QUADS);
// Right face
// Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
// Top Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
// Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
// Bottom Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glEnd();

glBindTexture(GL_TEXTURE_2D,texture[5]);
glBegin(GL_QUADS);
// Left Face
// Bottom Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
// Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
// Top Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f(-10f, 1.0f, 1.0f);
// Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();

/*xRot += 0.3f;
yRot += 0.4f;
zRot += 0.5f;*/

glutSwapBuffers();
}

六．实验收获
通过这次实验，我熟悉了OpenGL图形库，掌握了纹理映射实现方法。学会创建三角体和正方体并给他们每个面贴上相同纹理，创建正方体分别给六个面贴上不同的纹理，感觉受益匪浅。

10