Question

我试图只旋转我在Java中创建的场景中的两个对象中的一个 LWJGL。
现在，当我尝试旋转一个物体时，它不会围绕它的中心旋转，而是以大圆圈旋转。在Google上搜索后，我现在知道它应该像这样工作：

glPushMatrix();
glBegin();

  //Code in here

glEnd();
glRotate();
glPopMatrix();

但它不适合我。物体不旋转。这是我的渲染代码：

    public void render() {

        glPushMatrix();

            glRotatef(rotate, 0, 1.0f, 0);                   

            glBegin(GL_QUADS);

                // Top
                glVertex3f(-centerX + size, centerY + size, -centerZ - size);
                glVertex3f(-centerX - size, centerY + size, -centerZ - size);
                glVertex3f(-centerX - size, centerY + size, -centerZ + size);
                glVertex3f(-centerX + size, centerY + size, -centerZ + size);
                // Bottom
                glVertex3f(-centerX + size, centerY - size, -centerZ + size);
                glVertex3f(-centerX - size, centerY - size, -centerZ + size);
                glVertex3f(-centerX - size, centerY - size, -centerZ - size);
                glVertex3f(-centerX + size, centerY - size, -centerZ - size);
                // One side
                glVertex3f(-centerX + size, centerY + size, -centerZ + size);
                glVertex3f(-centerX - size, centerY + size, -centerZ + size);
                glVertex3f(-centerX - size, centerY - size, -centerZ + size);
                glVertex3f(-centerX + size, centerY - size, -centerZ + size);
                // Moar sides
                glVertex3f(-centerX + size, centerY - size, -centerZ - size);
                glVertex3f(-centerX - size, centerY - size, -centerZ - size);
                glVertex3f(-centerX - size, centerY + size, -centerZ - size);
                glVertex3f(-centerX + size, centerY + size, -centerZ - size);
                // Last side
                glVertex3f(-centerX - size, centerY + size, -centerZ + size);
                glVertex3f(-centerX - size, centerY + size, -centerZ - size);
                glVertex3f(-centerX - size, centerY - size, -centerZ - size);
                glVertex3f(-centerX - size, centerY - size, -centerZ + size);
                // Real last side
                glVertex3f(-centerX + size, centerY + size, -centerZ - size);
                glVertex3f(-centerX + size, centerY + size, -centerZ + size);
                glVertex3f(-centerX + size, centerY - size, -centerZ + size);
                glVertex3f(-centerX + size, centerY - size, -centerZ - size);

            glEnd();

        glPopMatrix();

        rotate++;
}

我现在尝试将此问题解决了几个小时，但无法使其正常工作。

Answer 1

在绘制四边形之前，您应该致电glRotate()和glTranslate()。

请记住，转换的顺序很重要。旋转始终约为0,0,0，因此如果您首先进行平移，它将围绕圆中的某个点进行“轨道”排序。如果你想让它围绕它自己的轴旋转（你可能会这样做）先旋转，然后翻译。

本文中有一节介绍转换的顺序。

http://www.glprogramming.com/red/chapter03.html

LWJGL仅旋转一个对象

1 个答案: