layout (location = 1) out vec2 oMotionVec;

in vec3 aMotionVec0;
in vec3 aMotionVec1;

void compute_motion_vectors()
{
   // Write motion vectors
   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;
   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;
   oMotionVec = vmotion1-vmotion0;
}