Am 13.05.2016 6:39 nachm. schrieb "Bojian Wu" <ustcb...@gmail.com>:
>
<snip>
>
> 1. I use 'obj-g' to generate two cube models, one with thickness and the
other one without thickness, when using 'rtshot' to ray trace the model,
they will output same result, does that result mean, the 'plate mode' is
only useful when the model is not a closed mesh(that is to say, the closed
mesh can always be considered as solid model)?
No. They only look the same from the outside. If the ray starts from
inside (e.g. when creating a section) the results will be different: One
model is solid, the other made from sheet. That's a big difference if we
look for "intrinsic values“, as many programs do which use BRL-CAD as a
geometric information provider.
Regards,
Daniel
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