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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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