---- solved ----
i allready work with shaders for some time, but today i am totally confused about a strange beavior.
I just strted a new opengl project and implemented a simple shader pair...
I was getting no visible result so i started testing around ..
In my new setup Project i only get visible output when i set 'gl_Position.z' between -1 and 1
Code :...// vertex shader last line gl_Position.z = -0.2 ; // << works gl_Position.z = -1.2 ; // << does not work ....
BUT in one of my other Projects i can use larger values and still see the output.
Code :...// vertex shader last line gl_Position.z = -0.2 ; // << works gl_Position.z = -8.2 ; // << works as well ....
I donīt understand why, cause as i use my onw Programm( shader pair ) and my own matrix fpr perspective
the opengl frustrum or any other global state should not have any effect on the visible range ( near / far clipping plane ).
Do in need to set a Frustum when i use shader and my own matrix ?
Can anyone tell me what i am doing wrong ??
What is my mistake - have i missunderstood something ??
thanx a lot !!
(edit) sorry i just spent 5 min away from the pc and now its all obvious to me.... question solved !