I have tweeted an image illustrating the problem with Flex ColumnSeries on a PlotChart when trying to overlay one on top of another.
Essentially, it can display one series alright, two or more OK on initialization, but after a bit of manipulation (in the user session), the columns lose their sense of where zero is, and begin to float (these series have no minfield, thus zero is their starting point). FWIW: the axis for these columns is on the right, but that can change given the type of data displayed.
The app this is for allows users to turn multiple series of multiple plotting styles on and off, change visual parameters, and even the order in which the series stack on top of each other -- just to give you an idea of what's going on.
Due to how dynamic this all is, I am doing most of the code in ActionScript.
So the questions are:
Is this fixable? Googling around has provided no insights, regardless of inquiry.
Is there a refresh function or equivalent within PlotChart/CartesianCharts that may help?
May this not be a problem with the chart canvas, but more of the axis which the series points to? or the series itself?
If it has not been made clear already: I am lost on this. The issue I have known about for ~a year now was first discovered on a Beta version of the app I am working on now, but it took a while for it to surface in an average user session. As the complexity of the app has grown (by client demand), the issue takes a lot less time to surface.
The issue also occurs on all versions of Flex I have used: 4.5, 4.6, 4.9... etc.
Please help, or offer pointers. Thanks!
Related
I am currently learning how to sculpt in Blender; working on my own projects after completing BlenderGuru's Beginner & Intermediate classes, and some of Grant Abbitts videos with pleasing results. I am trying to sculpt a plasmapistol with a skull on it, which can be seen in the reference photo that I have provided.
However, when I sculpt, I get these really odd linear artefacts (See picture below, circled in black). I added a Subsurf Modifier to the primitive UV Sphere, with the Viewport and Render Values set to 4, so it is a fairly fine mesh. However, these still artefacts occur.
I assume it is due to the stretching of the polygons when I grab the sphere with the Snake Hook tool and deform it to encompass the frontal part of the skull.
EDIT: Whilst writing this comment I went back, and switched on Dynamic Topology with Relative Detail selected.
It appears that I am no longer getting the issues that I was getting last night with the linear artefacts.
Can I confirm that these problems are a result of having the incorrect Dynamic Topology settings for using the Snake Hook Tool; I was using Constant Detail instead of Relative Detail, or is this being caused by another issue?
Also, any advice on avoiding common pitfalls when choosing the settings in sculpting would be most appreciated.
I will continue to ask this question incase anyone has a similar problem and it can be resolved by reading this.
Sculpt, showing lineations
Experimenting with Dynamic Topology
In Object Mode, does the object have uniform X, Y, & Z scaling? If not, you can apply the scale from the object menu.
Object ‣ Apply ‣ Scale / Rotation & Scale
I'm going to start off by saying that I'm very new to SDR and GNU Radio. This may be a dumb question, but I have been googling and testing things for about two months now trying to get this to work without success. Any help or pointers would be appreciated!
I'm attempting to use GNU Radio 3.8 to transfer a file using differential QPSK. I've tried to follow the tutorials on the wiki as well as several similar academic papers I found on the internet (which also seem to be based off the wiki tutorial). None of them worked on their own but combining what actually works from each one, I managed to create a flowgraph sans hardware that does indeed send and receive the data from a file. Here's the Flowgraph and here is a screenshot of the results. The results show the four constellation points, and the data from the file source matches up perfectly with the data having gone though the entire transmit+receive chain. In the simulation I have a throttle block and a channel model block where the LimeSDR Source and LimeSDR Sink block would be. So far so good (at least as far as I can tell).
When I actually start transmitting this signal with the SDR, the received data no longer matches up with what is transmitted. Here's the flowgraph I've been using for the transmission. I added a protocol formatter and some FEC blocks that I could have removed for this illustration, but the point is that simply looking at what bits are going into the modulator vs what's being recovered, the two do not match up. The constellation looks good (as far as I can tell) but the bits are all wrong. Here's a screenshot showing the bits being transmitted. You'll notice in the screenshot of the transmitted signal that the signal has a repeating series of three flat top "1's" surrounded on both sides by a period of "0's" (at time 1.5ms and 3.5ms). This is a screenshot of the received bits. At time 1ms and 3ms you can see how it is has significantly more transitions between 1 and 0 than it should.
So at this point I'm stumped. The simulation worked but the real world test does not. I've messed around with the RRC filter properties a significant amount. I have no clue if the values I have chosen are correct as I have not found a tutorial or explanation on how to do so. I just looked at some of the example flowgraphs and made some guesses as to how those values were derived and applied those guesses to my use case. It worked well in the simulation so I thought it would be fine in the real world test. I've tried a variety of samples per symbol but my goal is for a 4800 bit per second transfer speed, and using different samples per symbol didn't help anyway. What should I change in order to get this to work?
Bonus question: The constellation object has QPSK and DQPSK, and the constellation modulator has a differential checkbox. What is the best practice combination of selections to get a differential QPSK modulation?
I was wondering if someone else tried developing a hololens application using vuforia. Specifically, using vuforia's capacity to recognize and track objects.
I tried and it seems like it's working. I was just not sure about the result I got from the Debug.Log that print the name of the tracked object.
I tried putting two trackable targets millimeters away from each other and pointed my Gaze towards the distance between the objects(hoping it takes both).
Some how the output window gave me this.
It seems like I was able to track both targets but I want to know if I tracked two different objects at the same time.
I have this doubt because at some point, eventhough the hololens was in the same position as before, the output started to change and started printing only one of the two objects(the one in the right).
I think of this as a problem caused by hololens' small camera window or by hololens limited hardware.
In the vuforiaconfiguration you should be able to set the maximum simultaneous amount of objects your app can track. You need to make sure it is set to more than 1.
In the image above you see how you can set the maximum amount of tracked images in unity.
If you are not using unity you'll have to access the vuforiaconfiguration in another way and set the maximum simultaneous amount of tracked object there.
From code you can do it in c# like this:
VuforiaConfiguration.Instance.Vuforia.MaxSimultaneousImageTargets = 2;
I've been using oxyplot for a month now and I'm pretty happy with what it delivers. I'm getting data from an oscilloscope and, after a fast processing, I'm plotting it in real time to a graph.
However, if I compare my application CPU usage to the one provided by the oscilloscope manufacturer, I'm loading a lot more the CPU. Maybe they're using some gpu-based plotter, but I think I can reduce my CPU usage with some modifications.
I'm capturing 10.000 samples per second and adding it to a LineSeries. I'm not plotting all that data, I'm decimating it to a constant number of points, let's say 80 points for a 20 secs measure, so I have 4 points/sec while totally zoomed out and a bit more detail if I zoom in to a specific range.
With the aid of ReSharper, I've noticed that the application is calling a lot of times (I've 6 different plots) the IsValidPoint method (something like 400.000.000 times), which is taking a lot of time.
I think the problem is that, when I add new points to the series, it checks for every point if it is a valid point, instead of the added values only.
Also, it spends a lot of time in the MeasureText/DrawText method.
My question is: is there a way to override those methods and to adapt it to my needs? I'm adding 10.000 new values each second, but the first ones remain the same, so there's no need for re-validate them. Also, the text shown doesn't change.
Thank you in advance for any advice you can give me. Have a good day!
I am working on a game which was developed by some other guy earlier. I am facing a problem that when player(with camera) start running on the road the buildings are not being shown up in their regular shape and as we move forward (more closer to the buildings) they gain their original shapes, and some times the buildings present on either side of the road are not visible by camera ( empty space ) and when we move closer to the building it comes up as visible object suddenly. I think it may be some unity3d setting problem (rendering , camera or quality). May be, it was being done due to increase performance on mobile devices.
can anybody know what may be the issue or how to resolve it.
Any help will be appreciated. Thanks in advance
This sounds like it's a problem with the available LODs for each building's 3D model.
Basically, 3d games work by having 2-3 different versions of each 3D model, with varying *L*evels *O*f *D*etail. So for example, if you have a house model which uses 500 polygons, you'll probably have another 2 versions (eg 250 polys and 100 polys), which are used depending on the distance between the player and the object. The farther away he is, the simpler the version used will be.
The issue occurs when developers use automatically generated LOD models, which will look distorted or won't appear at all. Unity probably auto generates them, but I'm unsure where you'll find the settings for this in unity. However I've seen 3d models on the unity store offering models with different LODs, so unity probably gives you the option to set your own. The simplest solution would be to increase the distance the LODs change at, while the complicated solution would be to fix custom versions of the 3D models for larger distances, with a lower poly count.
I have resolved the problem. This was due to the LOD (level of details) used for objects (buildings) in Unity3d to enhance the performance on the slower device. LOD provides many level of details (of an object) which you can adjust according to your need . In my specific problem the buildings were suddenly appear due to the different (wrong) position for LOD1, i.e. for LOD1 the building was at wrong place but for LOD0 it was at its right place. So when my camera see from the distance it see LOD1 which was at wrong place thence it sees empty space with no building at the expected position. But when camera comes closer it sees LOD0 in which building is at the right position and it seems that buildings are suddenly come or become visible.