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| 10:55.03 | gabbar1947 | brlcad: all i can figure out now is that , 4D coordinates are nothing but the 3D coordinates transformed from euclidean to homogeneous coordinates and HCROSS() will basically return the cross product of those 3D points with the fourth coordinate as 0 coz, as such the cross product of two 4D vectors doesnt exist. Do you feel this is in the right direction ? |
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| 11:57.25 | ``Erik | gabbar1947: closish... the appendix in the opengl "red book" has some discussion... http://www.glprogramming.com/red/appendixf.html |
| 11:57.25 | gcibot | [ Appendix F - OpenGL Programming Guide ] |
| 12:22.38 | gabbar1947 | ``Erik: Oh fine. that was helpful. But where will this function come into use ? |
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| 15:21.15 | ``Erik | erm, whenever you need a cross product? a homogenized vector has 4 elements, but isn't 4d... there is no w axis (but w is not necessarily discardable)... it's more of a normalizing factor to allow multiplying by 4x4 matrices |
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| 16:33.10 | gabbar1947 | ``Erik: Normally these coordinates solve the " points at infinity" problem, like , it becomes easy to represent points at infinity and do the required calculation ! |
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| 17:52.42 | gabbar1947 | but there seems to be an issue: the function will not be defined if the fourth coordinate is 0, which basically refers to the 3D point at infinity. How should this be approached ? |
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| 19:54.38 | gabbar1947 | The HACKING file says that "EQUAL and !ZERO()" macros lie in bn.h, but i can nowhere find it in the file. |
| 21:29.35 | gabbar1947 | found them in vmath.h instead |
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| 22:07.24 | xfactor | Hi all ! I'm Bill Fosam and I'm interested in working with BRL-CAD in GSoC 2017. It's my first time participating and I'll like to know what material I should familiarize myself with in order to be able to contribute to this organization. I'm particularly interested in Creating X3D and building Object-oriented C++ Geometry API. I'm not familiar with developing CAD software but I'm willing to lea |
| 22:07.24 | xfactor | rn all it takes to be able to work with this organization. Cheers! |
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