rotation problem

OpenGL OpenGL: Basic Coding
1

Hi,

I have an horizontal plane at z = 0.0f and a
tree from 0.0f to 1.0f.

When I rotate this scene 180 degrees, the lower part of the trunk is sticking out from the plane. How do I conceal this lower part??

Thanks
tare

2

try to be more specific…

3

I don’t understand the question either !

try to be more clear with some code or something…

4

Do you mean that the plane and tree are not rotating about the same point?

5

Do you mean that one can see the lower part of the tree when looking from beneath the plane?

6

Yes Micheal …
you are right …
both the tree and the plane are rotating about the same point …
and I can see the bottom of the tree when I
rotate to the bottom of the plane.

Shouldnt the tree be covered by the plane??

7

Perhaps you have GL_LEQUAL as depth func.
Try to call that upon initialization:

glDepthFunc( GL_LESS );

8

I’ve already used glDepthFunc(GL_LESS)
but I can still see the bottom of the tree when I rotate 180 degrees.

Any more advices??? THanks!

9

Code!