 | | Re: 3D matrix math question
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(...) OK... I think I understand what I was getting at here. When you introduce perspective then the distance of the conditional point from the line becomes important. Eg. if you have a point that is directly behind its line in a perspective free (...) (16 years ago, 14-Dec-08, to lugnet.cad.dev, FTX)
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| | Re: Technicopedia Update
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(...) Wohoo! Almost as good as having the real model! I realize it's too much work and bandwith, to realistically use it on every model, but it can definitely be a bonus link on some of them! (16 years ago, 14-Dec-08, to lugnet.technic)
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| | Re: 3D matrix math question
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(...) Hmmm... Though I can't quite pin it down I have a suspicion that this has something to do with the spatial reduction cause by projection. What projection matrix are you using? Would a simple solution just be to move the conditional points (...) (16 years ago, 14-Dec-08, to lugnet.cad.dev, FTX)
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| | Re: 3D matrix math question
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(...) I am not the best in 3D, but if something outside the view frustum, you do not need to draw that. If you have the special case that only parts of what you should draw are outside the view frustum, I would go to calculate that values for a (...) (16 years ago, 14-Dec-08, to lugnet.cad.dev, FTX)
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| | Re: Technicopedia Update
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(...) Eric. Love the work you've put in so far, and I'd like to help out. If you give me some set numbers for which you don't have LDraw files, I'd be willing to put some time in and draw them up, provided the Peeron instructions scans are available (...) (16 years ago, 14-Dec-08, to lugnet.technic, FTX)
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| | Re: 3D matrix math question
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(...) Actually, the projected points are all that I am checking, and that's how it's supposed to work. (...) No. The way that conditional lines work is that if the two control points lie on the same side of the conditional line on the screen (in (...) (16 years ago, 14-Dec-08, to lugnet.cad.dev, FTX)
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| | Re: 3D matrix math question
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(...) If I understand correctly you shouldn't be checking on the projection, only on the full 3D transformed points. That means you should check after stage 2.5. You'll need the Z value to work out which side things lie on. Tim (16 years ago, 14-Dec-08, to lugnet.cad.dev, FTX)
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| | 3D matrix math question
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(...) I think I need help. I thought I was using gluProject for the conditional calculations, but discovered that I'm not. I multiple the projection matrix by the model-view matrix to get my transformation matrix, then run the points through that to (...) (16 years ago, 14-Dec-08, to lugnet.cad.dev, FTX)
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| | Qld Rain SMU driver cab
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After messing around for a few months, I gave up and began working on the EMU. Now that I have almost finished the EMU, I have worked out how to do the nose of the SMU. (URL) should be public soon - I hope. (16 years ago, 14-Dec-08, to lugnet.trains)
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| | Re: Technicopedia Update
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(...) OK, round 3. The black background is just due to the fact that I rendered it with an alpha channel so it is transparent. My animation software made this black by default, but it is easy to change. So with that in mind.... I've made a new one (...) (16 years ago, 14-Dec-08, to lugnet.technic, FTX)
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