平鋪渲染glFrustum剪切平面計算

Question

我試圖讓一個平鋪的渲染器工作（這個想法是通過將它分解成塊並渲染一個來渲染一個大的視錐體）。

我將代碼轉換成可視角度的標準透視投影到左，右，頂部和底部剪裁平面，然後可以傳遞到glFrustum。

我被困在正確地打破這一點。

Answer 1

幾個失誤後，我公司生產的以下內容：

//"int rect[4]" is the pixel rectangle of the original view 
//"int rect2[4]" is the pixel subrectangle within rect corresponding to the new view 
//"left", "right", "bottom", and "top" are the left, right, bottom, and top clipping 
// planes of the old view, respectively. 

float diff_x = right - left; 
float diff_y = top - bottom; 

result_left = (float)(rect2[0]  )/(float)(rect[2]) * diff_x + left; 
result_right = (float)(rect2[0]+rect2[2])/(float)(rect[2]) * diff_x + left; 
result_bottom = (float)(rect2[1]  )/(float)(rect[3]) * diff_y + bottom; 
result_top = (float)(rect2[1]+rect2[3])/(float)(rect[3]) * diff_y + bottom;