//
// Vertex shader for producing animated clouds (mostly cloudy)
//
// Authors: John Kessenich, Randi Rost
//
// Copyright (c) 2002-2004 3Dlabs Inc. Ltd. 
//
// See 3Dlabs-License.txt for license information
//

varying float LightIntensity;
varying vec3  MCposition;

uniform vec3  LightPos;
uniform float Scale;

void main(void)
{
  vec3 ECposition = vec3 (gl_ModelViewMatrix * gl_Vertex);
  MCposition      = vec3 (gl_Vertex) * Scale;
  vec3 tnorm      = normalize(vec3 (gl_NormalMatrix * gl_Normal));
  LightIntensity  = dot(normalize(LightPos - ECposition), tnorm);
  LightIntensity = 1.0;
  gl_Position     = ftransform();
}