IRC log for #brlcad on 20170301

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06:58.00 sanket_ i want to contribute to annotations project. Can someone help me with getting started? Thanks :)
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07:34.31 brlcad gabbar1947: see src/librt/primitives/table.c and the corresponding rt_functab definition in include/rt/functab.h to see which primitives do not have various callbacks
07:35.04 brlcad sanket_: did you have a more specific question?
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08:49.08 gabbar1947 brlcad: sounds good, thanks !
08:52.23 gabbar1947 Looking into the code, it seems that the function HCROSS() is not yet implemented. Can I get the details regarding the function. TIA:
09:00.03 brlcad gabbar1947: if you have to ask, then it's not an appropriate task for you -- that information is easily found by searching the web
09:00.47 brlcad heck, even just following the naming conventions in vmath.h, it should be evident
09:04.13 brlcad (and that's not intenteded to be a slight on your abilities, you just want to pick something you can work rather independently to demonstrate ability)
09:28.44 gabbar1947 brlcad: my bad, I asked the question in a wrong way. I'm aware of cross products, just wanted to confirm whether it is the 4D vector cross product or I'm taking things in a wrong way.
09:29.04 brlcad ah, no worries
09:29.09 brlcad yep, it's a 4d vector
09:29.17 brlcad so you just have to homogenize it first
09:29.36 brlcad (probably)
09:30.09 gabbar1947 oh yess! I'm aware, thanks
09:31.29 brlcad some other options: http://math.stackexchange.com/questions/720813/do-four-dimensional-vectors-have-a-cross-product-property
09:31.30 gcibot [ linear algebra - Do four dimensional vectors have a cross product property? - Mathematics Stack Exchange ]
09:32.27 gabbar1947 all we need is the magnitude of the final determinant , right ?
09:34.09 brlcad if we assume they're really 3-dimensional
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13:52.08 gabbar1947 brlcad: so i think, a separate case has to be made if the 4th coordinate comes out to be zero as we can't homogenize then
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19:59.50 gabbar1947 I had a simple doubt , might be lame, but where does 4D cross product come to use in brlcad. Because anyways we have to assume it as a projection of a 3D vector and then homogenize it.
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