[英]Why is my depth testing not working in PyOpenGL
我對 3D 圖形很陌生,所以我只是在學習:-D。 我想創建一個立方體作為我的第一個項目。 我選擇了 PyOpenGl 並遇到了以下問題:深度測試對我不起作用。 我在互聯網上搜索了教程,但沒有任何幫助我找到代碼中的錯誤。 誰能給我建議? 這是我的代碼:
import glfw
import math
from OpenGL.GL import *
glfw.init()
window = glfw.create_window(800, 600, "First Project", None, None)
glfw.set_window_pos(window, 400, 200)
glfw.make_context_current(window)
glEnableClientState(GL_VERTEX_ARRAY)
angle = 0.0005
cube = [
[-0.5, 0.5, 0],
[ 0.5, 0.5, 0],
[ 0.5, -0.5, 0],
[-0.5, -0.5, 0],
[-0.5, 0.5, -1],
[ 0.5, 0.5, -1],
[ 0.5, -0.5, -1],
[-0.5, -0.5, -1]
]
def RotateMatrix3DAroundX(x, y, z, angle):
Rx = 1 * x + 0 * y + 0 * z
Ry = 0 * x + math.cos(angle) * y + (-math.sin(angle) * z)
Rz = 0 * x + math.sin(angle) * y + math.cos(angle) * z
return [Rx, Ry, Rz]
def Drawing():
glBegin(GL_QUADS)
glColor3f(255, 0, 0)
glVertex3f(cube[0][0], cube[0][1], cube[0][2])
glVertex3f(cube[1][0], cube[1][1], cube[1][2])
glVertex3f(cube[1][0], cube[1][1], cube[1][2])
glVertex3f(cube[2][0], cube[2][1], cube[2][2])
glVertex3f(cube[2][0], cube[2][1], cube[2][2])
glVertex3f(cube[3][0], cube[3][1], cube[3][2])
glVertex3f(cube[3][0], cube[3][1], cube[3][2])
glVertex3f(cube[0][0], cube[0][1], cube[0][2])
glColor3f(0, 255, 0)
glVertex3f(cube[4][0], cube[4][1], cube[4][2])
glVertex3f(cube[5][0], cube[5][1], cube[5][2])
glVertex3f(cube[5][0], cube[5][1], cube[5][2])
glVertex3f(cube[6][0], cube[6][1], cube[6][2])
glVertex3f(cube[6][0], cube[6][1], cube[6][2])
glVertex3f(cube[7][0], cube[7][1], cube[7][2])
glVertex3f(cube[7][0], cube[7][1], cube[7][2])
glVertex3f(cube[4][0], cube[4][1], cube[4][2])
glColor3f(0, 0, 255)
glVertex3f(cube[0][0], cube[0][1], cube[0][2])
glVertex3f(cube[4][0], cube[4][1], cube[4][2])
glVertex3f(cube[4][0], cube[4][1], cube[4][2])
glVertex3f(cube[7][0], cube[7][1], cube[7][2])
glVertex3f(cube[7][0], cube[7][1], cube[7][2])
glVertex3f(cube[3][0], cube[3][1], cube[3][2])
glVertex3f(cube[3][0], cube[3][1], cube[3][2])
glVertex3f(cube[0][0], cube[0][1], cube[0][2])
glColor3f(150, 150, 150)
glVertex3f(cube[0][0], cube[0][1], cube[0][2])
glVertex3f(cube[4][0], cube[4][1], cube[4][2])
glVertex3f(cube[4][0], cube[4][1], cube[4][2])
glVertex3f(cube[5][0], cube[5][1], cube[5][2])
glVertex3f(cube[5][0], cube[5][1], cube[5][2])
glVertex3f(cube[1][0], cube[1][1], cube[1][2])
glVertex3f(cube[1][0], cube[1][1], cube[1][2])
glVertex3f(cube[0][0], cube[0][1], cube[0][2])
glColor3f(150, 0, 150)
glVertex3f(cube[1][0], cube[1][1], cube[1][2])
glVertex3f(cube[5][0], cube[5][1], cube[5][2])
glVertex3f(cube[5][0], cube[5][1], cube[5][2])
glVertex3f(cube[6][0], cube[6][1], cube[6][2])
glVertex3f(cube[6][0], cube[6][1], cube[6][2])
glVertex3f(cube[2][0], cube[2][1], cube[2][2])
glVertex3f(cube[2][0], cube[2][1], cube[2][2])
glVertex3f(cube[1][0], cube[1][1], cube[1][2])
glColor3f(150, 150, 0)
glVertex3f(cube[3][0], cube[3][1], cube[3][2])
glVertex3f(cube[7][0], cube[7][1], cube[7][2])
glVertex3f(cube[7][0], cube[7][1], cube[7][2])
glVertex3f(cube[6][0], cube[6][1], cube[6][2])
glVertex3f(cube[6][0], cube[6][1], cube[6][2])
glVertex3f(cube[2][0], cube[2][1], cube[2][2])
glVertex3f(cube[2][0], cube[2][1], cube[2][2])
glVertex3f(cube[3][0], cube[3][1], cube[3][2])
glEnd()
for i in range(8):
cube[i] = RotateMatrix3DAroundX(cube[i][0], cube[i][1], cube[i][2], angle)
while not(glfw.window_should_close(window)):
glfw.poll_events()
glClearColor(0, 0, 0, 0)
glEnable(GL_DEPTH_TEST)
glDepthFunc(GL_LESS)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
Drawing()
glfw.swap_buffers(window)
glfw.terminate()
這是我得到的結果圖像: image_of_my_result
立方體的一部分被查看體積的近平面和遠平面剪裁。 設置到近平面和遠平面距離較大的正交投影:
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(-1, 1, -1, 1, -2, 2)
glMatrixMode(GL_MODELVIEW)
while not(glfw.window_should_close(window)):
# [...]
不要改變立方體頂點,而是使用旋轉矩陣:
def Drawing():
# [...]
glRotate(math.degrees(angle), 1, 0, 0)
# DELETE
#for i in range(8):
# cube[i] = RotateMatrix3DAroundX(cube[i][0], cube[i][1], cube[i][2], angle)
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