opengl绘制曲面柱体的代码，和绘制圆柱体的一半的代码

绘制曲面柱体的代码：

// 绘制曲面柱体
void drawSurfaceCylinder(float height, float radius, int slices, int stacks) {
    float x = 0.0f, y = 0.0f, z = 0.0f;
    float theta = 0.0f, phi = 0.0f;
    float theta_step = 2 * M_PI / slices;
    float phi_step = M_PI / stacks;
    float texture_step_s = 1.0f / slices;
    float texture_step_t = 1.0f / stacks;
    float texture_s = 1.0f, texture_t = 1.0f;
    float texture_s_step = -2.0f / slices;
    float texture_t_step = -1.0f / stacks;
    float radius_step = radius / stacks;
    float radius_curr = radius;

    glBegin(GL_TRIANGLE_STRIP);
    for (int j = 0; j <= stacks; j++) {
        x = radius_curr;
        z = 0.0f;
        for (int i = 0; i <= slices; i++) {
            glTexCoord2f(texture_s, texture_t);
            glNormal3f(x / radius_curr, y / radius_curr, z / radius_curr);
            glVertex3f(x, y, z);
            x = radius_curr * cos(theta);
            z = radius_curr * sin(theta);
            glTexCoord2f(texture_s, texture_t - texture_step_t);
            glNormal3f(x / radius_curr, y / radius_curr, z / radius_curr);
            glVertex3f(x, y + height / stacks, z);

            theta += theta_step;
            texture_s += texture_step_s;
        }
        y += height / stacks;
        radius_curr -= radius_step;
        phi += phi_step;
        theta = 0.0f;
        texture_s = 1.0f;
        texture_t += texture_t_step;
    }
    glEnd();
}

绘制圆柱体一半的代码：

// 绘制圆柱体一半
void drawHalfCylinder(float height, float radius, int slices) {
    float x = 0.0f, y = 0.0f, z = 0.0f;
    float theta = 0.0f;
    float theta_step = 2 * M_PI / slices;

    glBegin(GL_TRIANGLE_STRIP);
    for (int i = 0; i <= slices; i++) {
        x = radius * cos(theta);
        z = radius * sin(theta);
        glNormal3f(x / radius, y / radius, z / radius);
        glVertex3f(x, y, z);
        glNormal3f(x / radius, y / radius, z / radius);
        glVertex3f(x, y + height, z);

        theta += theta_step;
    }
    glEnd();
}

这两个函数都需要在程序中包含math.h和GL/glut.h头文件。