Strange problems when drawing 3D cubes

leetidus

I used VC+DX3D to write a program to draw a 3D cube, and everything else was normal. I didn’t expect the back surface to block the front surface.
For example: a cube placed directly in front, the front plane is larger than the back plane (due to the principle of vision), so it shows that a smaller plane appears in the center of the front plane, which is the back plane. . .
I don't know why

leetidus

plus: My rendering culling state is not culling

leetidus

Even more strange is that the problem was solved after I ENABLE ZBUFFER ^-^!
Since no one returns, let me ask another question:
Why the drawn cube is not square from many angles, it is a bit oblique.
It is very different from the human eye.

tomkan110

You are using Z buffering! You can't see the latter

Did you mark the matrix coordinates when you put it in!

foxdrug

For example, if CULLMODE is reversed, what you see is the inside of the box.
There is also that the Z buffer is not turned on, so the front is blocked from the back.

yeyeaye

The awkward visual effect may be a problem with the FOV setting, which is generally 45 to 60 degrees.