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 | | Re: POV Color Cheat! Turn Pink into Medium Blue [DAT]
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| (...) This is a great idea that deserves to be highlighted while we're waiting for L3P and other programs to support ldconfig.ldr! Inpired be the objects like timers, dialog objects, menu items etc I add to a Form in a Delphi project, I just came up (...) (17 years ago, 9-Apr-07, to lugnet.cad.ray)
| | | | | Re: Inverse matrix?
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| The latest: (URL) (17 years ago, 8-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| (...) Well I'll be! That works too! Thanks you guys! James (17 years ago, 8-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix? [DAT]
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| (...) Did you mean this: [ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ] [ 1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16 ] I have yet to try it. James (17 years ago, 8-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| (...) I learned my matrix math from a 3d game programming book and I have no idea what the diagonals are... I was going to look it up but I got Travis' code to work! (URL) might still look it up as I may need to know about it) James (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| (...) I mean swap the OFF-diagonals, leave the diagonals as is. (...) (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| (...) Just take the transpose of the 3x3 world rotation matrix and it should work as the inverse. Transpose means swap diagonals M[1,2] <=> M[2,1] etc. If this doesn't work I've misunderstood you. Tim (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| (...) Hehehe, cool, I'll try that. Thanks! James (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| Clarification! .... snip (...) I am using additional points to specify the location of feet. Combined with the model location, I have 3 points for the hip and feet. [now the following paragraph should make more sense] (...) (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | Re: Inverse matrix?
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| (...) Arg. I thought this was going to be easy. I liked this part of the wikipedia article: "In practice, inverting a matrix is rarely required. Most of the time, one is really after the solution of a particular system of linear equations." Hm. I (...) (17 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
| | | | | 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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