rendering shadow maps outto disk to speed up your final renders
even after the rat shadow maps are baked to disk,
you can still change a number of parameters with having to write the shadow maps back to disk again
ie
colour
intensity
shadow intensity
shadow quality - im not sure about this one
shadow softness and shadow blur
NOTE INCREASING PIXEL SAMPLES AND RES IS VERY ADVERSE TO RENDER TIMES !
it may be better to increase pixel samples to get mor detail than to increase resolution fo the maps.
it seems double the map size and double the samples will more than quadruple the render times.
i should do some proper tests...
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