Message: Re: Rotation Bug? Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

More Re: Rotation Bug? 

Forum: Geometry
Re: Question Rotation Bug? (Antony Luk)
Re: None Re: Rotation Bug? (Joseph Perl)
Date: 11 Nov, 2008
From: Antony Luk <Antony Luk>

Thank you for your prompt reply, although I saw a nice picture in OpenGL, I am still confused by the simulation result.

I shoot optical photons from oil to the corner cube which is supposed to reflect the photon in the same direction. When the corner cube is not rotated, it does that perfectly:

                            In Oil       In CornerCube
Momentum	x	0.078797569	0.075998564
Momentum	y	-0.151291332	-0.145917242
Momentum	z	-0.985343532	-0.986373346

after several total internal reflections:

                         In Corner cube      In Oil					
Momentum	x	-0.075998564	-0.078797569
Momentum	y	0.145917242	0.151291332
Momentum	z	0.986373346	0.985343532

However, after I rotate the corner cube (adding that rotate1 matrix), strange thing happens:

                           In Oil       In Corner cube					
Momentum	x	0.07852449	0.079233159
Momentum	y	-0.150843674	-0.151433265
Momentum	z	-0.98543396	-0.985286797

after several total internal reflections:

                        In Corner cube      In Oil					
Momentum	x	-0.079233159	-0.082129395
Momentum	y	0.151433265	0.156968656
Momentum	z	0.985286797	0.984182708

The corner cube is still doing its work perfectly, but when the photon goes out of the corner cube, the direction seems wrong. Any idea on that? I think the direction should only depends on refractive index so that it should be exactly just opposite to the direction before light enter corner cube, no matter the corner cube is rotated or not. I tried many photons and the same thing happen so that the image of light from corner cube has a systematic shift after I rotate the corner cube.

 Add Message Add Message
to: "Re: Rotation Bug?"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]