Regarding complex shadows from a topography

Hi guys, i've been trying to proyect the shadow of an island so i can then generate the self-cast shadow and i'm experiencing problems. Used mesh shadow but the mesh generated from the surface (using delauny command) is way too complex (20,000> faces) and when using heliotrope on the surface the shadow does not recognize the complex "outline" generated by the changes in topography. This post is more oriented to the developers of heliotrope and the various tools, but if anyone can provide a solution it would be greatly appreciated.

Cheers, Diego