LWJGL：渲染天空盒

Question

我目前渲染天空盒，像這樣的更有效的方法：

 //Front Face 
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, skybox[0].getTextureID()); 
    GL11.glBegin(GL11.GL_QUADS); 
     GL11.glTexCoord2f(1f, 0.0f); 
     GL11.glVertex3f(-player.x - offset, -player.y - offset, -player.z - offset); 
     GL11.glTexCoord2f(1f, 1f); 
     GL11.glVertex3f(-player.x - offset, -player.y + offset, -player.z - offset); 
     GL11.glTexCoord2f(0.0f, 1f); 
     GL11.glVertex3f(-player.x + offset, -player.y + offset, -player.z - offset); 
     GL11.glTexCoord2f(0.0f, 0.0f); 
     GL11.glVertex3f(-player.x + offset, -player.y - offset, -player.z - offset); 
    GL11.glEnd(); 

    // Back Face 
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, skybox[2].getTextureID()); 
    GL11.glBegin(GL11.GL_QUADS); 
     GL11.glTexCoord2f(0.0f, 0.0f); 
     GL11.glVertex3f(-player.x - offset, -player.y - offset, -player.z + offset); 
     GL11.glTexCoord2f(1f, 0.0f); 
     GL11.glVertex3f(-player.x + offset, -player.y - offset, -player.z + offset); 
     GL11.glTexCoord2f(1f, 1f); 
     GL11.glVertex3f(-player.x + offset, -player.y + offset, -player.z + offset); 
     GL11.glTexCoord2f(0.0f, 1f); 
     GL11.glVertex3f(-player.x - offset, -player.y + offset, -player.z + offset); 
    GL11.glEnd(); 

    // Top Face 
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, skybox[4].getTextureID()); 
    GL11.glBegin(GL11.GL_QUADS); 
     GL11.glTexCoord2f(1f, 1f); 
     GL11.glVertex3f(-player.x - offset, -player.y - offset, -player.z - offset); 
     GL11.glTexCoord2f(0.0f, 1f); 
     GL11.glVertex3f(-player.x + offset, -player.y - offset, -player.z - offset); 
     GL11.glTexCoord2f(0.0f, 0.0f); 
     GL11.glVertex3f(-player.x + offset, -player.y - offset, -player.z + offset); 
     GL11.glTexCoord2f(1f, 0.0f); 
     GL11.glVertex3f(-player.x - offset, -player.y - offset, -player.z + offset); 
    GL11.glEnd(); 

    // Bottom Face 
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, skybox[5].getTextureID()); 
    GL11.glBegin(GL11.GL_QUADS); 
     GL11.glTexCoord2f(1f, 0f); 
     GL11.glVertex3f(-player.x - offset, -player.y + offset, -player.z - offset); 
     GL11.glTexCoord2f(1f, 1f); 
     GL11.glVertex3f(-player.x - offset, -player.y + offset, -player.z + offset); 
     GL11.glTexCoord2f(0f, 1f); 
     GL11.glVertex3f(-player.x + offset, -player.y + offset, -player.z + offset); 
     GL11.glTexCoord2f(0f, 0f); 
     GL11.glVertex3f(-player.x + offset, -player.y + offset, -player.z - offset); 
    GL11.glEnd(); 


    // Right face 
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, skybox[3].getTextureID()); 
    GL11.glBegin(GL11.GL_QUADS); 
     GL11.glTexCoord2f(0.0f, 0.0f); 
     GL11.glVertex3f(-player.x - offset, -player.y - offset, -player.z - offset); 
     GL11.glTexCoord2f(1f, 0.0f); 
     GL11.glVertex3f(-player.x - offset, -player.y - offset, -player.z + offset); 
     GL11.glTexCoord2f(1f, 1f); 
     GL11.glVertex3f(-player.x - offset, -player.y + offset, -player.z + offset); 
     GL11.glTexCoord2f(0.0f, 1f); 
     GL11.glVertex3f(-player.x - offset, -player.y + offset, -player.z - offset); 
    GL11.glEnd(); 

    // Left Face 
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, skybox[1].getTextureID()); 
    GL11.glBegin(GL11.GL_QUADS); 
     GL11.glTexCoord2f(1f, 0.0f); 
     GL11.glVertex3f(-player.x + offset, -player.y - offset, -player.z - offset); 
     GL11.glTexCoord2f(1f, 1f); 
     GL11.glVertex3f(-player.x + offset, -player.y + offset, -player.z - offset); 
     GL11.glTexCoord2f(0.0f, 1f); 
     GL11.glVertex3f(-player.x + offset, -player.y + offset, -player.z + offset); 
     GL11.glTexCoord2f(0.0f, 0.0f); 
     GL11.glVertex3f(-player.x + offset, -player.y - offset, -player.z + offset); 
    GL11.glEnd(); 

這似乎是要去約渲染天空盒極其低效的方式，因爲我要保持紋理之間切換四邊形。此外，像這樣渲染四邊形往往歸因於像單個像素線（四邊形之間的接縫）的視覺僞像。我聽說利用立方體貼圖來提高效率，但我正在努力實現。如果你們有任何建議，請隨時指出我的方向。謝謝。

Answer 1

立方體貼圖基本上將所有六個貼圖放在一個貼圖上。然後改變你的座標，只有一次，使用glBindTexture一旦這會是這樣的：

GL11.glBindTexture(GL11.GL_TEXTURE_2D, skybox.getTextureID()); 
GL11.glBegin(GL11.GL_QUADS); 
    //Front Face 
    GL11.glTexCoord2f(0.25f, 0.25f); 
    GL11.glVertex3f(-player.x - offset, -player.y - offset, -player.z - offset); 
    GL11.glTexCoord2f(0.25f, 0.5f); 
    GL11.glVertex3f(-player.x - offset, -player.y + offset, -player.z - offset); 
    GL11.glTexCoord2f(0.0f, 0.5f); 
    GL11.glVertex3f(-player.x + offset, -player.y + offset, -player.z - offset); 
    GL11.glTexCoord2f(0.0f, 0.25f); 
    GL11.glVertex3f(-player.x + offset, -player.y - offset, -player.z - offset); 

    // Back Face 
    ... 
GL11.glEnd(); 

對於渲染天空盒時更optimalisations考慮禁用深度緩衝。您也可以停止清除顏色位。