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 April 10, 2008, 08:45 UDF growing radius #1 Greg Guest   Posts: n/a Hi, I try to simulate the wave of a blast. So as to do that, I try to make moving a semicircle wall imputing the blast equation. How can I imput this displacment when it is actually an enlargement of the radius of this semicircle? I don't know how I can imput a rate of change of the radius. If you have another idea, each point of this semicircle as to move with the same speed but in a different direction.( along its radius) Thank you very much for your help. Greg

 April 11, 2008, 11:19 Re: UDF growing radius #2 Greg Guest   Posts: n/a Like I have no answetr I will try to simplify my question. By using Define_Geom I want to set a movement depending of time. My equation would look like something like this: (position[0]-a)^2+(postion[1]-b)^2=((dtime-t0)*e(dtime-t0))^2 where a b are coordinate of the center of the circle and the second member of the equation the varying radius. Any help or comment would help me. Greg