BRL-CAD provides a couple dozen distinct primitives. Each primitive is defined by a set of parameters. We'd like to have each primitive modeled with diagramming arrows and labels.
This task involves creating an infinite halfspace (HALF) and modeling the corresponding arrows/segments for all parameters. Scalars should be dashed lines, vectors should be arrows. Here's an example:
- http://brlcad.org/~starseeker/gci_primitive_figures/
Make something like that for the HALF, but with different material properties. That example put objects into a box for a particular visual effect. See if you can get a better effect without the exterior box (you'll have to change shader properties).
Submit your .g file and a ray traced rendering/diagram of the model. This command run within mged may help:
rt -s1024 -A0.75 -c {set ambSamples=128}
| File name/URL | File size | Date submitted | |
|---|---|---|---|
| half.png | 81.1 KB | December 21 2012 10:19 UTC | |
| half.g | 3.4 KB | December 21 2012 10:19 UTC | |
| half.g | 5.9 KB | December 24 2012 00:41 UTC | |
| New.png | 83.6 KB | December 24 2012 00:42 UTC | |
| half1.png | 393.4 KB | December 24 2012 17:49 UTC | |
| half.g | 7.7 KB | December 24 2012 17:49 UTC | |
| half.g | 13.6 KB | January 09 2013 12:27 UTC | |
| latest.png | 16.5 KB | January 09 2013 12:28 UTC | |
| half.g | 28.7 KB | January 10 2013 03:38 UTC | |
| Capture.jpg | 162.4 KB | January 10 2013 03:48 UTC | |
| half.g | 40.8 KB | January 10 2013 08:45 UTC | |
| Capture.jpg | 145.7 KB | January 10 2013 08:46 UTC |
I would like to work on this task.
This task has been assigned to Sharan. You have 48 hours to complete this task, good luck!
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What is the problem ? Can you explain it to me, so that i can complete it.
This is one of the more difficult primitives to diagram, but I don't think your current image is right. Halfspaces are defined as a distance along a vector from the origin. The 'd' scalar is a distance along that vector (there is no 'D'). Overlaying the wireframe in mged and rendering with perspective enabled may help.
The deadline of the task has been extended with 2 days and 0 hours.
The following work is to be done-(correct me if i am wrong)
Instead of 'N' vector there should be a 'd' scalar.And 'N' should be the sphere
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Not quite. There should be a sphere at 0,0,0 with a vector (arrow) N going towards 'd'. Basically, you need to shift the dashed line down so that 'd' is right on the surface where you currently have N, put N down "inside" the gray area, and add an origin with an arrow for N. Something like this:
o 'd'
| (dashed line)
|
^ 'N'
| (solid line)
|
o (0,0,0)
Then try rendering with:
ae 35 25
set perspective 60
Or some similar angle where you can see the ground plane disappear into the distance.
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Sharan, that's closer but still not right. 'd' is where the "ground surface" is at. If you shift the diagram (including 'N") down and put a label for the origin, it should be good.
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Melange has detected that the final deadline has passed and it has reopened the task.
I would like to work on this task.
I was on my way to hometown when you extended it took two days on trains to reach there till then the task was reopened.
Today i am back from my hometown so i can complete the task now.
Please give me an another chance....
This task has been assigned to Sharan. You have 48 hours to complete this task, good luck!
The work on this task is ready to be reviewed.
Hi Sharan, welcome back! That looks a lot better but the diagram is still very confusing. Compared to the scale of the wireframe, you can't see the vector/arrow or the dashed line to 'd'. Can you scale them up double or maybe triple size?
Also, is that with perspective enabled? You can't tell if the "halfspace" wireframe is within the green or on top of it. Try applying a stack shader to it with checker and plastic. Also, try lowering the eye point a little so that the wireframe extends above the horizon (run ae command to set elevation lower, like ae 15 25 or something)
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Better but that's a bit too dark. Maybe try adding -A.75 or changing the checker colors to be a bit more bright.. Did lowering the elevation not work? I'd think it'll look better to see the checker diminish into the horizon so it's clearly an infinite plane. Something like http://www.featurepics.com/FI/Thumb300/20080615/Abstract-Grid-Horizon-769754.jpg but without the crazy sky and 3d gridlines ... and having the camera be a little closer to the ground.
Should also add a note saying either "origin" or "(0, 0, 0)" on the bottom sphere where the vector starts. The rest -- the new arrows, spheres, and dashes -- looks perfect.
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Sharan, thought you might like to know that I think you're currently tied with two others to make our top five. There are also about three people within two tasks that have a chance of passing you up too.
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It's not clear to me how you're getting that rendering as it looks like the annotation lines are on top of the plane, but I checked the .g and it looks like it's something we can work with. This is more like what I meant: http://brlcad.org/tmp/half.png
That way it is more clear that the wireframe is actually sitting on the surface and the lines are underneath.
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