opengl_es_examples/Demos/Navigation3D/OGLES2/SkyboxVertShader.vsh

attribute mediump vec3 inVertex;

uniform mediump mat4 ModelViewProjMatrix;

varying mediump vec3 vEyeDir;

void main()
{
	vEyeDir = -inVertex.xzy;
	gl_Position = ModelViewProjMatrix * vec4(inVertex, 1.0);
}