is there a limitation for hard shadow casting distance?

[taurus]

recently I found some solitaires in front of a rather massive fractal structure. My first thought was to make the front object cast a shadow on the rear structure. I tried manuslly - no success. I set up an animation moving the (shadow casting) light from upper left to upper right to lower right to lower left. While ther are shadows wandering accross the structure - uninterresting ones from the side - not a single frame contains shadows casted by the focus object.
So i ask myself, is this due to exceeding a max distance for hard shadow casting, or did I just try not hard enough?

the params:

Code:

Mandelbulb3Dv18{
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................................wBofdRRm7.2........B./.........E........y.2...wD
...Uz......H..../Q.1/....6......w8....Ef.....w7Rcc3CTgpD/QU.ZBwDzdee0dkpXk1....U
z.EnAnYD12../2EqhKqeI/bdzyO4RgpZjaxDqzOwy5PUfy9...........0u1....y1...sD...../..
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Kz1qrCNS93Zszm.Y7GJ85Tyj......2j....S.........kD.2....sD.2E.....................
.............oAnAt1...wD....z.rbu3.2UeL.k0eS/.Jcu3.wVeL.E8eS/.ncu3..d4wD9/...k1.
.....AQxcz1.......kz.wzzz1.A..E.I/....3...kM.........c3...U1....4....I1....uHtbb
...S.W1KEyzlciszsU3YzTAe906.5AqzCLjk..EbG7eFT5uj4odIWOorVy1...........k/8..../6.
.A72QifFjz9.H0/bvOonz4........../AV0.sXTL0..SQcDqMitzu/BQKxV62zD..........E.2c..
2LeV..UPAI91pRzjZ/...................Il.8.EerN3..QhDJnpv/.A8RfRUeyk..1ERN9Nj8G/k
32U0..6U.0..36PrFOuvz0kXyRh2eVxD.MfUU2SWYz9...8cU0.E./2Ezz/cU08../2E.tzDU08c..2E
./IzT/8cU0.E./2EQs5cU08../2E./bTU08c..2E./2ly/8cU0.E./2EMw5cU08../2E.lqTU08c..2E
./2kz/8cU0.E./2E...cU08czz/cU08cyz1cU08cxz3cU08clUX9e/rN........................
E....2.....6....I....U....EEh3aSdtqNUAJRmN4...........................k/.MU/4.U.
..........kBnAnAnAFwzczzzzzzzSwDhNaNaNaVpz1......kS6./......Uq/k.......MM.Q7....
...Yz...........................................................................
........................}

and the image

[lxh]

Try it with max. length calculation value 3 in the post process hard shadow.

[taurus]

Try it with max. length calculation value 3 in the post process hard shadow.

those who can read are clearly in advantage...
thanks!

[Alef]

Noticed this question throught mobile and wanted to answer, but lxh was first. Probably 1.0 is whole screen and 0.5 is half???