Opengl教程之读取stl文件并绘制在picturecontrol控件内
Opengl教程之读取stl并绘制在picturecontrol控件内
By Cracent
作为机械专业方向的人员，我们经常需要用SolidWorks构建模型。有些时候我们被要求将这些模型通过OPENGL进行表达。STL 是三维模型常用的文件格式，其使用三角面片来表示三维实体模型。本文进行将进行STL模型可视化研究，并开放源代码。
参考代码：http://download.csdn.net/detail/cracent/9758053
一、我们使用SolidWorks建立一个一字连接件并另存为STL格式
二、配置相应环境
三、建立CMyStatic类
2.1 添加类
2.2 类向导
2.2.1添加消息处理函数OnTimer()
2.2.2 重写虚函数PreSubclassWindow()
2.3 添加其他函数与变量
三、OpenGl使用
3.1函数内容
3.2插入picture control控件， 并为其添加控制变量
以上几步请参考我的另一篇文章：《Opengl教程之读取obj并绘制在picturecontrol控件内》
四、stl文件读取
void CMyStatic::GLFunc4()
{
int max = 0;
bool isbegin = false;
long size = 0;
int nlines = 0;
int count1 = 0;
int count2 = 0;
FILE* file = fopen("2.stl","r");
fseek(file, 0L, SEEK_END);
size = ftell(file);
fclose(file);
file = fopen("2.stl","r");
for (int i = 0;i < size;i++)
{
if (getc(file) == '\n')
{
nlines++;
}
}
num = nlines / 7;
rewind(file);
while (getc(file) != '\n');
verts = new float[9 * num];
vnorms = new float[9 * num];
for (int i = 0;i < num;i++)
{
char x[200] = "";
char y[200] = "";
char z[200] = "";
if (3 != fscanf(file, "%*s %*s %80s %80s %80s\n", x, y, z))
{
break;
}
vnorms[count1] = vnorms[count1 + 3] =vnorms[count1 + 6] = atof(x);
count1++;
vnorms[count1] = vnorms[count1 + 3] =vnorms[count1 + 6] = atof(y);
count1++;
vnorms[count1] = vnorms[count1 + 3] =vnorms[count1 + 6] = atof(z);
count1 += 7;
fscanf(file, "%*s %*s");
if (3 != fscanf(file, "%*s %80s %80s %80s\n", x, y, z))
{
break;
}
if (isbegin == false)
{
isbegin = true;
max = atof(z);
}
verts[count2] = atof(x);
count2++;
verts[count2] = atof(y);
count2++;
verts[count2] = atof(z);
count2++;
if (3 != fscanf(file, "%*s %80s %80s %80s\n", x, y, z))
{
break;
}
verts[count2] = atof(x);
count2++;
verts[count2] = atof(y);
count2++;
verts[count2] = atof(z);
count2++;
if (3 != fscanf(file, "%*s %80s %80s %80s\n", x, y, z))
{
break;
}
verts[count2] = atof(x);
count2++;
verts[count2] = atof(y);
count2++;
verts[count2] = atof(z);
count2++;
fscanf(file, "%*s");
fscanf(file, "%*s");
}
}
五、STL文件显示
void CMyStatic::GLFunc5()
{
glClear(GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-0.0f, -0.0f, -COpengl10基本环境Dlg::m_gltran-10);
static int RotateDegTriangle = 1;
glRotatef(RotateDegTriangle++,RotateDegTriangle++, RotateDegTriangle++, 0.0f);
glPushMatrix();
int m_div = 1;
for (int i = 0; i < 9*num; i++)
{
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f);
glNormal3f(vnorms[i] / m_div,vnorms[i+1] / m_div, vnorms[i+2] / m_div);
glVertex3f((-verts[i]+ verts[1]) /m_div, (-verts[i+1]+ verts[2]) / m_div, (-verts[i+2]+ verts[3]) / m_div);
i += 3;
glColor3f(0.0f, 1.0f, 0.0f);
glNormal3f(vnorms[i] / m_div, vnorms[i +1] / m_div, vnorms[i + 2] / m_div);
glVertex3f((-verts[i] + verts[1]) /m_div, (-verts[i + 1] + verts[2]) / m_div, (-verts[i + 2] + verts[3]) / m_div);
i += 3;
//glColor3f(0.0f, 0.0f, 1.0f);
glNormal3f(vnorms[i] / m_div, vnorms[i +1] / m_div, vnorms[i + 2] / m_div);
glVertex3f((-verts[i] + verts[1]) /m_div, (-verts[i + 1] + verts[2]) / m_div, (-verts[i + 2] + verts[3]) / m_div);
i += 2;
glEnd();
}
glPopMatrix();
SwapBuffers(hdc); //利用双缓冲
}
六、运行程序，我们可以看到如下画面
至此，本次可视化研究告一段落，欢迎交流。