|Message: Re: Photons traveling form one solid to another touching one||Not Logged In (login)|
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> I have created a sphere and tried to put 121 cylinders next to the sphere. > When I shoot a particle into the sphere, a the resultant photons will not > travel into the cylinders. I checked for overlapping using the placement > parameters and there is none. > I just tried to make an array of union solids and add one cylinder to the > sphere then add one cylinder to that union solid, and so on until I got all > 121 cylinders on it. > > The code builds but there is a bus error mid run. Both solutions attempted [(a) placements, and (b) union of tubs] are valid ones and should work if the geometry and the optics setup are defined correctly. BTW, if you post the complete code, we may be able to help with less words... For (a), it should be verified that the tubes are indeed sharing the surface with the cut-sphere, you can verify that by shooting geantinos perpendicular to the shared surfaces and see what tracking says when crossing. For (b), you must assure that tubes are instead intersecting the sphere (i.e. define them slightly longer) in order to create a valid union. Creating a BREP is a solution (BTW, examples for patching a BREP solid can be found in the BREP library itself looking at the concrete solids, tub/box/polycone/..., defined therein), but makes little sense here since would be rather inefficient. Cheers, Gabriele
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