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 | | Re: Inverse matrix?
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| (...) I just realised something... do you want a general inverse or a specific inverse? Some inversions are simple eg. a pure rotation can be inverted by taking its transpose and reflections are their own inverses. Tim (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| (...) There really is no easy way to do it. Feel free to look at TCVector::invertMatrix in the LDView code if you want to see code that does it on a 4x4 matrix. To convert a 3x3 matrix into a 4x4 matrix, put the 3x3 in the top left, put a 1 in the (...) (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| (...) The inverse of <1,0,0,0,1,0,0,0,1,0,0,0> is itself. To compute the inverse of a general 3x3 matrix (essentially what you need to do) is rather complicated. You could do it in a macro using Gaussian elimination [1]. Tim [1] (URL) (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Inverse matrix?
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| Does anyone know how to generate an inverse matrix. By inverse I mean it will undo the rotation of the original matrix. I thought the inverse of <1,0,0,0,1,0,0,0,1,0,0,0> was <-1,0,0,0,-1,0,0,0,-1,0,0,0>. In other words, multiply every value by -1. (...) (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: A question about an animation scene
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| (...) You are not specifying a custom clock value so your spline lasts from frames 1 to 121. You actually want to specify a custom clock value. Something like this: animate_by_spline (east_to_south, auto_banking (0) + spline_clock ( ..... ) )} The (...) (17 years ago, 6-Apr-07, to lugnet.cad.ray)
| | | | | Re: A question about an animation scene
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| (...) --snip-- (...) Hi Eduardo, The spline macro would be useful too ;) Tim (17 years ago, 4-Apr-07, to lugnet.cad.ray)
| | | | | A question about an animation scene
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| I have made a scene where a car follows a spline this is the main co ---...--- object { car_dot_dat matrix <0,0,1,0,1,0,-1,0,0,0,0,0> #if (version >= 3.1) material #else texture #end { Color7 } //translate<-960,-24,1860> rotate -90*y (...) (17 years ago, 4-Apr-07, to lugnet.cad.ray)
| | | | | RACHAL Changeover
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| Hi all, It's a day late but we changeover from RACHAL 1 - Atmosphobic to the all new RACHAL 2 - RACHAL Impossible today. Thank you very much to everyone who submitted an entry. I really enjoy seeing what you've all come up with and it we some (...) (17 years ago, 1-Apr-07, to lugnet.cad.dev.org.ldraw, lugnet.cad.ray, lugnet.announce, FTX) !
| | | | | Re: Light is too bright!
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| (...) In my 1998 Christmas picture (URL) (go to the end of the page) I hand adjusted the lights (one inside each candle) quite a bit. One important part was the material settings (Color46_t), as the clear L3P parts are much *too* clear. Most of the (...) (17 years ago, 26-Mar-07, to lugnet.cad.ray)
| | | | | Re: Light is too bright!
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| (...) Wow! Thank you! I didn't know that. I tried some different options, and found that the "black" light (color 0, which isn't really black) surpringly produced the best balance between taillights noticably on and not spreading too much red light (...) (17 years ago, 25-Mar-07, to lugnet.cad.ray, FTX)
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