Hi Constantin,
On 10/15/2010 08:23 AM, Constantin Müller wrote:
>>
>> Thanks! Looking at the log I've noticed that at one point this changes:
>> from: glClearDepth(1.000000) to: glClearDepth(0.000000)
>>
>> So the problem is that you are clearing the depth buffer with the value for
>> objects 'in' the near plane and nothing will pass the depth test afterward.
>> Do you at some point change the clear depth of a background perhaps?
>>
>
> Yes, I changed the clear Depth. But this does just effects, that the values
> after the near-plane is behind the geometry are not '0' but '255'.
>
> It does not affect, that the image values are not changing after that.
Hm, not sure I follow on this one. ClearDepth will change the value the depth
buffer is cleared to. If you set it to 0, with the usual GL_LEQUAL depth test,
only the pixels on the near plane will be drawn, everything else will be
invisible.
> Perhaps I might describe the behaviour again, I could have made it not clear
> enough.
>
> I start my program and setup the scenegraph. Then I render the scene 4 times
> in one function, with different states. After the 3rd rendering I print out
> the stencil values.
>
> When I first start the rendering the image shows, what I expect. Then I
> render more times with different near plane values and the image does not
> change (but it should) until i reach the point, where the nearplane is beyond
> the geometry. Then the buffer shows just '255'.
>
> After that I change the nearplane value back to where the geometry should be
> visible, but nothing happens with the image.
>
> I hope this helps a bit to understand what I mean.
>
> I thougt it could be, that I forget to change the States to the standard
> values after rendering my 4 times, but I can't explain the sudden change,
> when the nearplane gets behind the geometry, with that explanation.
Do you think there is a way for us to get something that demonstrates this
algorithm? A cur-down version of your program, or maybe you can just
cut-n-paste
the core into an example program? We're really having a hard time seeing where
this is supposed to go.
Yours
Dirk
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