I posted a simple patch to povray.binaries.programming that decreases
sensibly the rendering time of scenes with objects in subject (for 
lathe and sphere_sweep when using the cubic_spline attribute). 

The point is that when searching the roots of a high degree polynomial, 
there's no reason to search every root in [0 Max_distance] when only 
those in [0 1] are needed. I extended the function Solve_Polynomial 
to accept a new parameter fixing the range of interest, and where 
possible used it. 

Affected files are:

src/polysolv.cpp
src/polysolv.h
src/lathe.cpp
src/blob.cpp
src/sphsweep.cpp

Scenes that show differences are, for example:

scenes/objects/lathe1c.pov
scenes/objects/lathe2.pov

scenes/objects/blob1b.pov
scenes/objects/blob1a.pov

Comments, hints appreciated as always. 

Massimo

Post a reply to this message