I found this useful for creating an image name from a string created while rendering.

The string 'newname' is calculated during the parse.


//by Bryan Valencia
//POV-RAY v. 3.6
//Create and execute a DOS Batch command after each frame
//example


//works with the following line in the render ini file
//Post_Frame_Command=fix.bat %o

#declare cmd1=concat("del  \"",newname,"\"\n");
#declare cmd2=concat("ren %1  \"",newname,"\"\n");


#fopen myfile "fix.bat" write
#write(myfile, cmd1)
#write(myfile, cmd2)
#fclose myfile

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