Congrats!

Just in case, here is some code from the manual that appears to address the floor sinking issue:

Code:

---

var friction;

action move_me 
{
  while (1)
  {
    force.PAN = -10 * KEY_FORCE.X; // calculate rotation force
    my.SKILL14 = TIME*force.PAN + max(1-TIME*0.7,0)*my.SKILL14; // rotation speed
    my.PAN += TIME * my.SKILL14; // rotate the player

    vec_set(temp,my.x);
    temp.z -= 4000; // calculate a position 4000 quants below the player
    // set a trace mode for using the player's hull, and detecting map entities and level surfaces only 
    trace_mode = ignore_me+ignore_sprites+IGNORE_MODELS+USE_BOX;
    result = trace(my.x,temp); // subtract vertical distance to ground

    if (RESULT > 5) // in the air?
    { 
      force.X = 0; // no pushing force
      force.Y = 0;
      force.Z = -5; // gravity force
      friction = 0.1; // air friction
    }
    else // on or near ground
    { 
      force.X = 10 * KEY_FORCE.Y; // translation force
      force.Y = 0;
      force.Z = -0.5 * RESULT; // ground elasticity
      friction = 0.7; // ground friction
    }

    my.SKILL11 = TIME*force.X + max(1-TIME*friction,0)*my.SKILL11; // calculate ahead speed
    my.SKILL13 = TIME*force.Z + max(1-TIME*friction,0)*my.SKILL13; // calculate vertical speed
    dist.X = TIME * my.SKILL11; // distance ahead
    dist.y = 0;
    dist.Z = TIME * my.SKILL13; // distance down

    move_mode = ignore_passable + glide;
    ent_MOVE(dist,nullvector); // move the player
    move_view(); // move the camera
    wait(1);
  }
}

---

Note the "if (result > 5)" statement which lowers the fall 'force' to 0.5 to prevent the one frame where the entity sinks through the floor. I am in the belief that 3DGS does a move, collision check, move collision check type deal.