You are totally right about glBindAttribLocation(). The problem was weird when I changed vec3 Position to vec4 Position it worked ! No idea why is it so . I will also try to avoid mixing...

You are totally right about glBindAttribLocation(). The problem was weird when I changed vec3 Position to vec4 Position it worked ! No idea why is it so . I will also try to avoid mixing...

I am dealing with geometry shaders using GL_ARB_geometry_shader4 extension.

My code goes like :

GLfloat vertices[] =
{
0.5,0.25,1.0,
0.5,0.75,1.0,
...

You got it right man :-)
Huge mistake !
Thanks for the reply

1) The values in the array are concrete for sure.

2) The values are all within limits. I have done proper error checking in actual code

3) I wish to render using VBO only , but if the data is...

I am trying to copy data within same buffer using glCopyBufferSubData().

array[24];

glCopyBufferSubData(GL_ARRAY_BUFFER,GL_ARRAY_BUFFER,sizeof(array)/2,0,sizeof(array)) ;
...