nomail@nomail wrote:
> Why did this happen? Please tell me.

  You have to specify "photons { target }" only in those objects which
are reflecting/refracting (and which you want to have caustics) and these
objects must not be infinite (such as planes).

  You do not specify "photons { target }" for objects which are not
reflecting/refracting nor those which are infinite. (If you *really*
need photons to be directly shot at an infinite object, you'll have
to make it finite by manually specifying a bounding box for it.)

  Having an infinite object being the target for photons is one reason
for the photon calculations to take forever.

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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