UltimateZoneBuilder/Source/Core/Resources/world3d_skybox.vp

in vec3 AttrPosition;
in vec2 AttrUV;

out vec3 Tex;
out vec4 viewpos;

uniform mat4 world;
uniform mat4 view;
uniform mat4 projection;

uniform vec4 campos;  //w is set to fade factor (distance, at wich fog color completely overrides pixel color)

void main()
{
	viewpos = view * world * vec4(AttrPosition, 1.0);
	gl_Position = projection * viewpos;
	vec3 worldpos = (world * vec4(AttrPosition, 1.0)).xyz;
	vec4 skynormal = vec4(0.0, 1.0, 0.0, 0.0);
	vec3 normal = normalize((world * skynormal).xyz);
	Tex = reflect(worldpos - campos.xyz, normal);
}