#define INFINITE 1000.0

uniform vec3 lightDirection = vec3(0.57, 0.57, -0.57);
uniform float lightDistance = 1e4;

in vec3 pos;

out VertexData
{
  vec3 pos;           /* local position */
  vec4 frontPosition; /* final ndc position */
  vec4 backPosition;
}
vData;

void main()
{
  vData.pos = pos;
  vData.frontPosition = point_object_to_ndc(pos);
  vData.backPosition = point_object_to_ndc(pos + lightDirection * lightDistance);
}