如何在 pyglet 中制作一个立方体，上面有图像

Question

我正在制作一个 3d 游戏，我需要将图像粘贴到立方体上，但我找不到 front/back/top/ bottom/left/right 纹理应该去。

刚开始用pyglet，不是很熟悉。这几天我一直在翻转立方体的纹理部分，但它仍然是一团糟。下面是我的立方体函数代码：

def cuboid(self, x1,y1,z1, x2,y2,z2, tex):
    '''
    Draws a cuboid from x1,y1,z1 to x2,y2,z2 and covers each side with tex\n
    tex format:\n
        (front, back, left, right, top, bottom)
    Facing in the -z direction
    '''
    front = tex[0]
    back = tex[1]
    left = tex[2]
    right = tex[3]
    top = tex[4]
    bottom = tex[5]

    tex_coords = ("t2f", (0,0, 1,0, 1,1, 0,1))

    self.batch.add(4,GL_QUADS,back,('v3f',(x1,y1,z1, x1,y1,z2, x1,y2,z2, x1,y2,z1, )),tex_coords)
    self.batch.add(4,GL_QUADS,right,('v3f',(x2,y1,z2, x2,y1,z1, x2,y2,z1, x2,y2,z2, )),tex_coords)
    self.batch.add(4,GL_QUADS,top,('v3f',(x1,y1,z1, x2,y1,z1, x2,y1,z2, x1,y1,z2, )),tex_coords)
    self.batch.add(4,GL_QUADS,front,('v3f',(x1,y2,z2, x2,y2,z2, x2,y2,z1, x1,y2,z1, )),tex_coords)
    self.batch.add(4,GL_QUADS,bottom,('v3f',(x2,y1,z1, x1,y1,z1, x1,y2,z1, x2,y2,z1, )),tex_coords)
    self.batch.add(4,GL_QUADS,left,('v3f',(x1,y1,z2, x2,y1,z2, x2,y2,z2, x1,y2,z2, )),tex_coords)

我无法显示我的预期，因为我没有可用的 3d 渲染程序。

Answer 1

我假设坐标(x1,y1,z1)是立方体的最小值，坐标是最大值(x1,y1, z1).例如：

self.cuboid(0, 0, 0, 1, 1, 1, self.tex)

如果在视图 space 中绘制立方体，则：

x-axis指向左边。 left 纹理必须放置在所有顶点的 x 坐标为 x1 的位置，而 right 纹理必须放置在 x 坐标为 x2:

的位置

self.batch.add(4, GL_QUADS, right,  ('v3f',(x1,y1,z1, x1,y1,z2, x1,y2,z2, x1,y2,z1)), tex_coords)
self.batch.add(4, GL_QUADS, left,   ('v3f',(x2,y1,z2, x2,y1,z1, x2,y2,z1, x2,y2,z2)), tex_coords)

y-axis点向上。所以 bottom 是 y 坐标 y1 的位置，顶部是 y 坐标的 y2:

self.batch.add(4, GL_QUADS, bottom, ('v3f',(x1,y1,z1, x2,y1,z1, x2,y1,z2, x1,y1,z2)), tex_coords)
self.batch.add(4, GL_QUADS, top,    ('v3f',(x1,y2,z2, x2,y2,z2, x2,y2,z1, x1,y2,z1)), tex_coords)

在Right-handed system the z axis points out of the view. The z-axis is the Cross product的x-axis和y-axis.
这导致 front 必须放在 z-coordinates 是 z2 和 back 的地方 z-coordinates 是 z1:

self.batch.add(4, GL_QUADS, back,   ('v3f',(x2,y1,z1, x1,y1,z1, x1,y2,z1, x2,y2,z1)), tex_coords)
self.batch.add(4, GL_QUADS, front,  ('v3f',(x1,y1,z2, x2,y1,z2, x2,y2,z2, x1,y2,z2)), tex_coords)

方法cuboid:

def cuboid(self, x1,y1,z1, x2,y2,z2, tex):
    '''
    Draws a cuboid from x1,y1,z1 to x2,y2,z2 and covers each side with tex\n
    tex format:\n
        (front, back, left, right, top, bottom)
    Facing in the -z direction
    '''
    front  = tex[0]
    back   = tex[1]
    left   = tex[2]
    right  = tex[3]
    top    = tex[4]
    bottom = tex[5]

    tex_coords = ("t2f", (0,0, 1,0, 1,1, 0,1))

    self.batch.add(4, GL_QUADS, right,  ('v3f',(x1,y1,z1, x1,y1,z2, x1,y2,z2, x1,y2,z1)), tex_coords)
    self.batch.add(4, GL_QUADS, left,   ('v3f',(x2,y1,z2, x2,y1,z1, x2,y2,z1, x2,y2,z2)), tex_coords)
    self.batch.add(4, GL_QUADS, bottom, ('v3f',(x1,y1,z1, x2,y1,z1, x2,y1,z2, x1,y1,z2)), tex_coords)
    self.batch.add(4, GL_QUADS, top,    ('v3f',(x1,y2,z2, x2,y2,z2, x2,y2,z1, x1,y2,z1)), tex_coords)
    self.batch.add(4, GL_QUADS, back,   ('v3f',(x2,y1,z1, x1,y1,z1, x1,y2,z1, x2,y2,z1)), tex_coords)
    self.batch.add(4, GL_QUADS, front,  ('v3f',(x1,y1,z2, x2,y1,z2, x2,y2,z2, x1,y2,z2)), tex_coords)

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