Question

这是我创建的圆柱体：

void drawCylinder(float r, float g, float b) {
    setMaterialColors(r, g, b);
    glColor4f(r, g, b, 1.0);
    /* top triangle */
    double i, resolution  = 0.1;
    double height = 1, radius = 0.5;
    glPushMatrix();
    glTranslatef(0, -0.5, 0);
    glBegin(GL_TRIANGLE_FAN);
        glVertex3f(0, height, 0);  /* center */
        for (i = 0; i <= 2 * PI; i += resolution)
            glVertex3f(radius * cos(i), height, radius * sin(i));
    glEnd();

    /* bottom triangle: note: for is in reverse order */
    glBegin(GL_TRIANGLE_FAN);
        glVertex3f(0, 0, 0);  /* center */
        for (i = 2 * PI; i >= 0; i -= resolution)
            glVertex3f(radius * cos(i), 0, radius * sin(i));
        /* close the loop back to 0 degrees */
        glVertex3f(radius, height, 0);
    glEnd();

    /* middle tube */
    glBegin(GL_QUAD_STRIP);
        for (i = 0; i <= 2 * PI; i += resolution)
        {
            glVertex3f(radius * cos(i), 0, radius * sin(i));
            glVertex3f(radius * cos(i), height, radius * sin(i));
        }
        /* close the loop back to zero degrees */
        glVertex3f(radius, 0, 0);
        glVertex3f(radius, height, 0);
    glEnd();
    glPopMatrix();
}

现在，我无法将纹理映射到它。我试着保持纹理坐标与三角形条带坐标相同，但它不起作用。

PS：我不想使用gluCylinder。我知道它存在。

编辑：如果我只能对磁盘进行纹理处理，那就没问题了。四边形条不需要纹理化。

Answer 1

对于中心：将i除以2 * PI以获得在0.0和1.0之间变化的数字，并将其用作纹理坐标：

for (i = 0; i <= 2 * PI; i += resolution)
{
    const float tc = ( i / (float)( 2 * PI ) );
    glTexCoord2f( tc, 0.0 );
    glVertex3f(radius * cos(i), 0, radius * sin(i));
    glTexCoord2f( tc, 1.0 );
    glVertex3f(radius * cos(i), height, radius * sin(i));
}

/* close the loop back to zero degrees */
glTexCoord2f( 0.0, 0.0 );
glVertex3f(radius, 0, 0);
glTexCoord2f( 0.0, 1.0 );
glVertex3f(radius, height, 0);

对于endcaps：您可以直接使用sin() / cos()输出（几乎）：

glTexCoord2f( 0.5, 0.5 );
glVertex3f(0, height, 0);  /* center */
for (i = 0; i <= 2 * PI; i += resolution)
{
    // scale sin/cos range (-1 to 1) by 0.5 to get -0.5 to 0.5
    // then shift that range up/right by 0.5 to get 0 to 1:
    glTexCoord2f( 0.5f * cos(i) + 0.5f, 0.5f * sin(i) + 0.5f );
    glVertex3f(radius * cos(i), height, radius * sin(i));
}

完整示例：

#include <GL/glew.h>
#include <GL/glut.h>
#include <cmath>

void cylinder()
{
    const double PI = 3.14159;

    /* top triangle */
    double i, resolution  = 0.1;
    double height = 1;
    double radius = 0.5;

    glPushMatrix();
    glTranslatef(0, -0.5, 0);

    glBegin(GL_TRIANGLE_FAN);
        glTexCoord2f( 0.5, 0.5 );
        glVertex3f(0, height, 0);  /* center */
        for (i = 2 * PI; i >= 0; i -= resolution)

        {
            glTexCoord2f( 0.5f * cos(i) + 0.5f, 0.5f * sin(i) + 0.5f );
            glVertex3f(radius * cos(i), height, radius * sin(i));
        }
        /* close the loop back to 0 degrees */
        glTexCoord2f( 0.5, 0.5 );
        glVertex3f(radius, height, 0);
    glEnd();

    /* bottom triangle: note: for is in reverse order */
    glBegin(GL_TRIANGLE_FAN);
        glTexCoord2f( 0.5, 0.5 );
        glVertex3f(0, 0, 0);  /* center */
        for (i = 0; i <= 2 * PI; i += resolution)
        {
            glTexCoord2f( 0.5f * cos(i) + 0.5f, 0.5f * sin(i) + 0.5f );
            glVertex3f(radius * cos(i), 0, radius * sin(i));
        }
    glEnd();

    /* middle tube */
    glBegin(GL_QUAD_STRIP);
        for (i = 0; i <= 2 * PI; i += resolution)
        {
            const float tc = ( i / (float)( 2 * PI ) );
            glTexCoord2f( tc, 0.0 );
            glVertex3f(radius * cos(i), 0, radius * sin(i));
            glTexCoord2f( tc, 1.0 );
            glVertex3f(radius * cos(i), height, radius * sin(i));
        }
        /* close the loop back to zero degrees */
        glTexCoord2f( 0.0, 0.0 );
        glVertex3f(radius, 0, 0);
        glTexCoord2f( 0.0, 1.0 );
        glVertex3f(radius, height, 0);
    glEnd();

    glPopMatrix();
}

GLuint tex;
void init()
{
    unsigned char data[] =
    {
        128, 128, 128, 255,
        255, 0, 0, 255,
        0, 255, 0, 255,
        0, 0, 255, 255,
    };

    glGenTextures( 1, &tex );
    glBindTexture( GL_TEXTURE_2D, tex );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
    glTexImage2D( GL_TEXTURE_2D, 0,GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, data );
}

float angle = 0;
void timer( int value )
{
    angle += 6;
    glutPostRedisplay();
    glutTimerFunc( 16, timer, 0 );
}

void display()
{
    glClearColor( 0, 0, 0, 1 );
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    gluPerspective( 60, 1.0, 0.1, 100.0 );

    glMatrixMode( GL_MODELVIEW );
    glLoadIdentity();
    glTranslatef( 0, 0, -5 );

    glEnable( GL_CULL_FACE );
    glEnable( GL_DEPTH_TEST );

    glRotatef( angle, 0.2, 0.3, 0.1 );

    glEnable( GL_TEXTURE_2D );
    glBindTexture( GL_TEXTURE_2D, tex );
    cylinder();

    glutSwapBuffers();
}

int main(int argc, char **argv)
{
    glutInit( &argc, argv );
    glutInitDisplayMode( GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE );
    glutInitWindowSize( 600, 600 );
    glutCreateWindow( "GLUT" );
    init();
    glutDisplayFunc( display );
    glutTimerFunc( 0, timer, 0 );
    glutMainLoop();
    return 0;
}

Answer 2

看起来你有一个功能性解决方案。但是与原始代码相比，我认为还有一些东西值得改进，所以我仍然希望提供另一种选择。它解决了：

使用大量sin / cos次调用以及分区都非常低效，这些调用都非常昂贵。下面的代码使用一个sin，一个cos和几个可以在编译时进行评估的分区。其余的都是加法和乘法，这些操作要快得多。
原始代码使用浮点值进行循环控制。由于浮点值本质上是不精确的，因此这或多或少会“随机”地导致一次或多次迭代，具体取决于舍入的发生方式。
原始代码使用float，double和int类型的混合。 float适用于坐标，不需要使用较慢的双精度，也可以使用昂贵的类型转换回float。

代码（未经测试，但希望足够接近以表达提议的方法）：

// Number of segments a circle is divided into.
const unsigned DIV_COUNT = 32;

// Calculate angle increment from point to point, and its cos/sin.
float angInc = 2.0f * M_PI / static_cast<float>(DIV_COUNT);
float cosInc = cos(angInc);
float sinInc = sin(angInc);

// Draw top cap.
glBegin(GL_TRIANGLE_FAN);

glTexCoord2f(0.5f, 0.5f);
glVertex3f(0.0f, height, 0.0f);

glTexCoord2f(1.0f, 0.5f);
glVertex3f(radius, height, 0.0f);

float xc = 1.0f;
float yc = 0.0f;
for (unsigned iDiv = 1; iDiv < DIV_COUNT; ++iDiv) {
    float xcNew = cosInc * xc - sinInc * yc;
    yc = sinInc * xc + cosInc * yc;
    xc = xcNew;
    glTexCoord2f(0.5f + 0.5f * xc, 0.5f + 0.5f * yc);
    glVertex3f(radius * xc, height, -radius * yc);
}

glTexCoord2f(1.0f, 0.5f);
glVertex3f(radius, height, 0.0f);

glEnd();

// Draw bottom cap.
glBegin(GL_TRIANGLE_FAN);

glTexCoord2f(0.5f, 0.5f);
glVertex3f(0.0f, 0.0f, 0.0f);

glTexCoord2f(1.0f, 0.5f);
glVertex3f(radius, 0.0f, 0.0f);

xc = 1.0f;
yc = 0.0f;
for (unsigned iDiv = 1; iDiv < DIV_COUNT; ++iDiv) {
    float xcNew = cosInc * xc - sinInc * yc;
    yc = sinInc * xc + cosInc * yc;
    xc = xcNew;
    glTexCoord2f(0.5f + 0.5f * xc, 0.5f + 0.5f * yc);
    glVertex3f(radius * xc, 0.0f, radius * yc);
}

glTexCoord2f(1.0f, 0.5f);
glVertex3f(radius, 0.0f, 0.0f);

glEnd();

float texInc = 1.0f / static_cast<float>(DIV_COUNT);

// Draw cylinder.
glBegin(GL_TRIANGLE_STRIP);

glTexCoord2f(0.0f, 0.0f);
glVertex3f(radius, 0.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(radius, height, 0.0f);

xc = 1.0f;
yc = 0.0f;
float texCoord = 0.0f;
for (unsigned iDiv = 1; iDiv < DIV_COUNT; ++iDiv) {
    float xcNew = cosInc * xc - sinInc * yc;
    yc = sinInc * xc + cosInc * yc;
    xc = xcNew;
    texCoord += texInc;
    glTexCoord2f(texCoord, 0.0f);
    glVertex3f(radius * xc, 0.0f, radius * yc);
    glTexCoord2f(texCoord, 1.0f);
    glVertex3f(radius * xc, height, radius * yc);
}

glTexCoord2f(0.0f, 0.0f);
glVertex3f(radius, 0.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(radius, height, 0.0f);

glEnd();

如果您对迁移到现代OpenGL感兴趣，我对这个问题的回答显示了如何使用VBO绘制圆圈：How to draw a circle using VBO in ES2.0。

如何在使用triangle_strip创建的OpenGL中构建圆柱体？

2 个答案: