OpenGL-轉換立方體

Question

我一直在學習OpenGL，因此決定編寫一個函數以繪制一個以0,0,0為中心的單位立方體，以便隨后按自己的意願進行變換。 它由6個面組成。

但是，我只能變換立方體上的一張臉:(

這是代碼：

void myUnitCube() {

  glPushMatrix();
  glNormal3f(0.0,0.0, 1.0);       
  glTranslated(0.0,0.0,-0.5);
  glRotated(180, 0.0,1.0,0.0);
  glRectf(-0.5, -0.5, 0.5, 0.5);  

  glPopMatrix();

  glPushMatrix();
  glNormal3f(0.0,0.0, 1.0);       
  glTranslated(0.0,0.0,0.5);
  glRectf(-0.5, -0.5, 0.5, 0.5);  

  glPopMatrix();

  glPushMatrix();
  glNormal3f(0.0,0.0, 1.0);       
  glTranslated(0.5,0.0,0.0);
  glRotated(90, 0.0,1.0,0.0);
  glRectf(-0.5, -0.5, 0.5, 0.5);  

  glPopMatrix();

  glPushMatrix();
  glNormal3f(0.0,1.0, 0.0);       

  glTranslated(-0.5,0.0,0.0);

  glRotated(-90, 0.0,1.0,0.0);
  glRectf(-0.5, -0.5, 0.5, 0.5);  

  glPopMatrix();

  glPushMatrix();
  glNormal3f(0.0,0.0, 0.0);       

  glTranslated(0.0,-0.5,0.0);

  glRotated(90, 1.0,0.0,0.0);
  glRectf(-0.5, -0.5, 0.5, 0.5);  

  glPopMatrix();

  glPushMatrix();
  glNormal3f(0.0,0.0, 0.0);       
  glTranslated(0.0,0.5,0.0);
  glRotated(-90, 1.0,0.0,0.0);
  glRectf(-0.5, -0.5, 0.5, 0.5);   

  glPopMatrix();
 }

如果在以下情況下調用myUnitCube() ：

  glPushMatrix();
  glTranslated(-4,0,-3);
  glPushMatrix();
  glScaled(8,0.1,6);

結果是只有要繪制的第一個面被縮放。 我該如何解決？ 我了解這種情況是由於pop引起的，但我需要它們...

謝謝！

Answer 1

您的矩陣推送次數和彈出次數是否匹配？ 根據您提供的代碼，它們不是。 這可能是導致您出現問題的原因。