Dear Kim,
I have done some research on the paper "Simulating Ocean Water" (the
paper you provide for me several days ago). And the third part -- Practical
Ocean Wave Algorthms ---- is an attriactive algorthms.
However , the corresponding codes in OSGOcean class -- FFTSimualtion--
is not in accord with origianl paper that presented. In the function "void
FFTSimulation::Implementation::computeHeights( osg::FloatArray* waveheights )
const" , the DFT algorithm is done for wave height simulation. But the final
lines in this member function really confused me a lot :
const float signs[2] = { 1.f, -1.f };
for(int y = 0; y < _N; ++y)
{
for(int x = 0; x < _N; ++x )
{
waveheights->at(y*_N+x) = _realData0[x*_N+y][0] * signs[(x
+ y) & 1];
}
}
So , could you please explain to me why "sings[(x+y)&1]" was used
here? In addation , why noly the "_realData0[x*_N+y][0]" used for the wave
height computation? To some extent , the codes here is not that corresponding
to the function(19) presented in the third part of the origianl paper. I have
taken several day to thought about it , but in vain. Therfore , I will feel
appreciate if you can give me a resonable reply or provide some relevant
materials to me.
I am looking forward to your reply.
Sincerely Yours,
Zhang Mi
School of Remote Sensing and Information Engineering , Wuhan Universiy ,
Hubei Provinence , China.
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
