opengl 绘制实心圆柱体(opengl画实体)

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glu中提供了一个绘制圆柱体的函数：

void gluCylinder( GLUquadric* quad, GLdouble base, GLdouble top, GLdouble height, GLint slices, GLint stacks )使用方法是：

GLUquadric *pObj; pObj = gluNewQuadric();

调用gluCylinder函数时，将pObj作为第一个参数传入。gluDeleteQuadric(pObj);

这样子绘制出的圆柱体是空心的：

我根据gluCylinder函数写了个函数，将两边封顶。

[cpp] view plaincopyvoid mySolidCylinder( GLUquadric* quad, GLdouble base, GLdouble top, GLdouble height, GLint slices, GLint stacks ) { glColor3f(.0/, 0.0, .0/.0); gluCylinder(quad, base, top, height, slices, stacks); //top DrawCircleArea(0.0, 0.0, height, top, slices); //base DrawCircleArea(0.0, 0.0, 0.0, base, slices); } GLvoid DrawCircleArea(float cx, float cy, float cz, float r, int num_segments) { GLfloat vertex[4]; const GLfloat delta_angle = 2.0*M_PI/num_segments; glBegin(GL_TRIANGLE_FAN); vertex[0] = cx; vertex[1] = cy; vertex[2] = cz; vertex[3] = 1.0; glVertex4fv(vertex); //draw the vertex on the contour of the circle for(int i = 0; i < num_segments ; i&#;&#;) { vertex[0] = std::cos(delta_angle*i) * r &#; cx; vertex[1] = std::sin(delta_angle*i) * r &#; cy; vertex[2] = cz; vertex[3] = 1.0; glVertex4fv(vertex); } vertex[0] = 1.0 * r &#; cx; vertex[1] = 0.0 * r &#; cy; vertex[2] = cz; vertex[3] = 1.0; glVertex4fv(vertex); glEnd(); } [cpp] view plaincopyvoid mySolidCylinder( GLUquadric* quad, GLdouble base, GLdouble top, GLdouble height, GLint slices, GLint stacks ) { glColor3f(.0/, 0.0, .0/.0); gluCylinder(quad, base, top, height, slices, stacks); //top DrawCircleArea(0.0, 0.0, height, top, slices); //base DrawCircleArea(0.0, 0.0, 0.0, base, slices); } GLvoid DrawCircleArea(float cx, float cy, float cz, float r, int num_segments) { GLfloat vertex[4]; const GLfloat delta_angle = 2.0*M_PI/num_segments; glBegin(GL_TRIANGLE_FAN); vertex[0] = cx; vertex[1] = cy; vertex[2] = cz; vertex[3] = 1.0; glVertex4fv(vertex); //draw the vertex on the contour of the circle for(int i = 0; i < num_segments ; i&#;&#;) { vertex[0] = std::cos(delta_angle*i) * r &#; cx; vertex[1] = std::sin(delta_angle*i) * r &#; cy; vertex[2] = cz; vertex[3] = 1.0; glVertex4fv(vertex); } vertex[0] = 1.0 * r &#; cx; vertex[1] = 0.0 * r &#; cy; vertex[2] = cz; vertex[3] = 1.0; glVertex4fv(vertex); glEnd(); }

最终绘制出的圆柱体：

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