如何做腿部运动，OpenGL

How to make leg movements, OpenGL?

本文关键字：OpenGL 运动 何做腿      更新时间：2023-10-16

当我尝试围绕枢轴点（腿的顶部）进行腿部运动时，相反，当我只想让腿来回摆动时，腿开始围绕错误的点旋转。

如何解决此问题？

这是我的代码。

glPushMatrix();
    glTranslatef(x+0.0f, y+6.0f, z-1.5f);
    glRotatef(walk, 1.0f,0.0f,0.0f);
    glBegin(GL_QUADS);
        glTexCoord2f(0.5f,0.0f); glVertex3f(x-1.0f, y-6.0f, z-3.0f);
        glTexCoord2f(1.0f,0.0f); glVertex3f(x-1.0f, y-6.0f, z-0.5f);
        glTexCoord2f(1.0f,0.5f); glVertex3f(x-1.0f, y-18.0f, z-0.5f);
        glTexCoord2f(0.5f,0.5f); glVertex3f(x-1.0f, y-18.0f, z-3.0f);
        glTexCoord2f(0.5f,0.0f); glVertex3f(x+1.0f, y-6.0f, z-3.0f);
        glTexCoord2f(1.0f,0.0f); glVertex3f(x+1.0f, y-6.0f, z-0.5f);
        glTexCoord2f(1.0f,0.5f); glVertex3f(x+1.0f, y-18.0f, z-0.5f);
        glTexCoord2f(0.5f,0.5f); glVertex3f(x+1.0f, y-18.0f, z-3.0f);
        glTexCoord2f(0.5f,0.0f); glVertex3f(x-1.0f, y-6.0f, z-3.0f);
        glTexCoord2f(1.0f,0.0f); glVertex3f(x+1.0f, y-6.0f, z-3.0f);
        glTexCoord2f(1.0f,0.5f); glVertex3f(x+1.0f, y-18.0f, z-3.0f);
        glTexCoord2f(0.5f,0.5f); glVertex3f(x-1.0f, y-18.0f, z-3.0f);
        glTexCoord2f(0.5f,0.0f); glVertex3f(x-1.0f, y-6.0f, z-0.5f);
        glTexCoord2f(1.0f,0.0f); glVertex3f(x+1.0f, y-6.0f, z-0.5f);
        glTexCoord2f(1.0f,0.5f); glVertex3f(x+1.0f, y-18.0f, z-0.5f);
        glTexCoord2f(0.5f,0.5f); glVertex3f(x-1.0f, y-18.0f, z-0.5f);
glEnd();
glPopMatrix();
glPushMatrix();
    glTranslatef(x+0.0f, y+6.0f, z+1.5f);
    glRotatef(-walk, 0.0f,0.0f,1.0f);
    glBegin(GL_QUADS);
        glTexCoord2f(0.5f,0.0f); glVertex3f(x-1.0f, y-6.0f, z+3.0f);
        glTexCoord2f(1.0f,0.0f); glVertex3f(x-1.0f, y-6.0f, z+0.5f);
        glTexCoord2f(1.0f,0.5f); glVertex3f(x-1.0f, y-18.0f, z+0.5f);
        glTexCoord2f(0.5f,0.5f); glVertex3f(x-1.0f, y-18.0f, z+3.0f);
        glTexCoord2f(0.5f,0.0f); glVertex3f(x+1.0f, y-6.0f, z+3.0f);
        glTexCoord2f(1.0f,0.0f); glVertex3f(x+1.0f, y-6.0f, z+0.5f);
        glTexCoord2f(1.0f,0.5f); glVertex3f(x+1.0f, y-18.0f, z+0.5f);
        glTexCoord2f(0.5f,0.5f); glVertex3f(x+1.0f, y-18.0f, z+3.0f);
        glTexCoord2f(0.5f,0.0f); glVertex3f(x-1.0f, y-6.0f, z+3.0f);
        glTexCoord2f(1.0f,0.0f); glVertex3f(x+1.0f, y-6.0f, z+3.0f);
        glTexCoord2f(1.0f,0.5f); glVertex3f(x+1.0f, y-18.0f, z+3.0f);
        glTexCoord2f(0.5f,0.5f); glVertex3f(x-1.0f, y-18.0f, z+3.0f);
        glTexCoord2f(0.5f,0.0f); glVertex3f(x-1.0f, y-6.0f, z+0.5f);
        glTexCoord2f(1.0f,0.0f); glVertex3f(x+1.0f, y-6.0f, z+0.5f);
        glTexCoord2f(1.0f,0.5f); glVertex3f(x+1.0f, y-18.0f, z+0.5f);
        glTexCoord2f(0.5f,0.5f); glVertex3f(x-1.0f, y-18.0f, z+0.5f);
glEnd();
glPopMatrix();

所有 OpenGL 旋转都是围绕点 （0， 0， 0） 完成的。因此，如果要围绕特定点（rx，ry，rz）旋转顶点，则必须进行以下转换：

Translate(-rx, -ry, -rz);
Rotate(alpha, beta, gamma);
Translate(rx, ry, rz);
相关文章：