# UDF for moving light beam

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 January 29, 2013, 15:45 UDF for moving light beam #1 New Member   pp Join Date: Jan 2013 Posts: 1 Rep Power: 0 Sponsored Links Dear All, I'm doing a simulation about a moving light beam and i really need some help. In my simulation the light beam should move spirally. I want to use a UDF to define the movement of the light beam. I have found a code about a Laser beam moving along y. I tried to change the code to define the movement along x and y but it didn't work. Does anyone know how can i define the x path also so that the light beam can move spirally? Thank you all in advance. Here the udf: #include "udf.h" DEFINE_PROFILE(laser_beam,t,i) { real y[ND_ND]; real Y; real y_0=-0.008; //starting point real v=0.003; //velocity of the laser beam real b=0.018; //width of the laser beam real I_0=10000000000; //Intensity real time=RP_Get_Real("flow-time"); face_t f; begin_f_loop(f,t) { F_CENTROID(y,f,t); Y=y[1]; if(Y>=y_0+time*v-b/2 && Y<=y_0+time*v+b/2) // moving along y F_PROFILE(f,t,i) = I_0; else F_PROFILE(f,t,i) = 0; } end_f_loop(f,t); }

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