檢視 $initialanglerange 的原始碼

$initialanglerange is deciding the photon emission angle. The scale is from 0 to <math>2\pi</math>. 


 $initialanglerange
 <math>\theta_{start}</math>  <math> \theta_{end} </math>

The initial photon emission angle range is decided by <br>
 <math>v_x = sin(\theta) </math>  
 <math>v_y = cos(\theta) </math>  

And theta is within  <math>\theta_{start} <  \theta < \theta_{end} </math>