Hi folks,

I'm trying to implement the falling cloth idea to do an animation. I
thought, to make things easier, I'd investigate persistent variables.
Unfortunately I must be missing something.

I've built a small test scene to show how I think I should do it, but
parsing the second frame I get a "Cannot assign uninitialized
identifier" error where I redefine the variable 'Centre' which should
persist but doen't appear to.

I'm using Megapov 0.5a.

Any help would be appreciated.

Bye for now,
	Mike Andrews.

// pv_test.pov start

#version unofficial MegaPov 0.5;

global_settings { 
  max_trace_level 10
  assumed_gamma 1
}

background { color rgb 0.5/<15,sqrt(15),1> }
                       
light_source {
	0*x
	colour rgb <1,.97,.95>
	translate vnormalize(<-2.5,2.1,-1>)*1.5e4
}

plane { y, 0 pigment { rgb 0.4 } }

#if (frame_number = 1)

  #declare Centre = <0,10,0>;
  
#else

  #declare Centre = Centre + 5*y;

#end

sphere { Centre, 10 pigment { rgb y } }

camera {
	up y
	right x*image_width/image_height
	location  <-30, 10, -80>
	direction <0.0, 0.0, 1>
	angle     45
	look_at   0.5*Centre
}

// pv_test.pov end

; persist.ini start

Persistent_Animation=on
Final_Frame=10

Width=384
Height=512
Antialias=Off

; persist.ini end

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