can someone explain to me the technology behind those 3d billboards in some cities
is it a special type of screen or its just two frameless screens placed at 90 degrees to each other
What type of software is used in creating the contents ( blender, unreal, or something else
can I try a DIY version with two flat monitors placed at 90 degrees
any link to more information about the hardware/software requirement?
Related
I'm in the process of buying a 7.5 acre plot of land in a wooded, hilly area. I would estimate that the elevation varies about 50 feet from the bottom of the creek to the top of the hill. I would like to find a good method for measuring the topography of the land so I can create a 3D model. It would be tremendously useful to be able to try out different land development ideas and to simulate locations for future buildings.
My low-tech version of doing this would be to set up a laser level and go around taking elevation measurements in a 3' or so grid pattern. As I thought about that, I realized that smartphones and similar devices have quite a few sensors built in that might make this a lot easier.
I learned about software that will use a drone to capture data and images to automatically generate a topo map and 3D model. Drone Deploy is one such tool. I do have a DJI Phantom 4, but I don't know if it's feasible to fly such an intricate path among trees to scan the entire property. I wonder if there's another way to use this amazing modern hardware (phone or drone) to make my task easy.
I would appreciate hearing any thoughts and ideas about this!
The thing with dronedeploy is that you fly above the trees usually 30meters is ok. In a cross pattern.
Why do you want to fly between the trees? You have to explain that first.
Original question below:
'What is the best way to achieve the below in sql:
Take an area such as Chicago Illinois, place a grid over it of cells 50m x 50m and place a point in the centre of each grid cell. The coordinates of each point will be used to look at a table of lat/longs and calculate which of these points are within 200m of each point from the grid.'
To provide more detail to the above to make things a bit clearer. The greater aim is to:
Query a table of lat/longs in sql (2012) to find the greatest number of points in a 200m radius. I believe that using the Geography capabilities in sql I can accomplish much of this. To be able to sample the table of points I wanted to create a grid (say of New York - 50m x 50m cells) and move a circle (200m radius) into the center of each square grid cell and then use the buffer function to find what was within the circle. However, I've been searching online and I haven't been able to find a way to create the grid and the central lat/longs.
I am aware of the haversine equation and have used it before (the inverse of this I suppose is what I'm looking for). I would just appreciate some guidance to make sure I don't go down the wrong avenue for too long.
When you are talking about UI You can't handle it in sql.
SQl is a relational database management system, or RDBMS, that supports a wide variety of transaction processing, business intelligence and analytics applications in corporate IT environments. but UI use In information technology, the user interface (UI) is everything designed into an information device with which a person may interact. This can include display screens, keyboards, a mouse and the appearance of a desktop. It is also the way through which a user interacts with an application or a website. The growing dependence of many companies on web applications and mobile applications has led many companies to place increased priority on UI in an effort to improve the user's overall experience .WHEN YOU ARE TALKING A BOUT DESIGN YOU HAVE TO USE UI NOT SQL.
this link can help you to find your solution.
I have a project where I have to recognize an entire room so I can calculate the distances between objects (like big ones eg. bed, table, etc.) and a person in that room. It is possible something like that using Microsoft Kinect?
Thank you!
Kinect provides you following
Depth Stream
Color Stream
Skeleton information
Its up to you how you use this data.
To answer your question - Official Micorosft Kinect SDK doesnt provides shape detection out of the box. But it does provide you skeleton data/face tracking with which you can detect distance of user from kinect.
Also with mapping color stream to depth stream you can detect how far a particular pixel is from kinect. In your implementation if you have unique characteristics of different objects like color,shape and size you can probably detect them and also detect the distance.
OpenCV is one of the library that i use for computer vision etc.
Again its up to you how you use this data.
Kinect camera provides depth and consequently 3D information (point cloud) about matte objects in the range 0.5-10 meters. With this information it is possible to segment out the floor (by fitting a plane) of the room and possibly walls and the ceiling. This step is important since these surfaces often connect separate objects making them a one big object.
The remaining parts of point cloud can be segmented by depth if they don't touch each other physically. Using color one can separate the objects even further. Note that we implicitly define an object as 3D dense and color consistent entity while other definitions are also possible.
As soon as you have your objects segmented you can measure the distances between your segments, analyse their shape, recognize artifacts or humans, etc. To the best of my knowledge however a Skeleton library can recognize humans after they moved for a few seconds. Below is a simple depth map that was broken on a few segments using depth but not color information.
I was wondering if I could get some advice on the best way to approach this.
I'm in the process of writing an emulator that runs old UK arcade fruit machines games that have 'feature boards'. The machines are similar to US slots. The actual board consists of many semi-transparent squares that are lit from behind (see image for an example). Image
What I'm looking to do is render a 3D representation of a machine by (preferably) using an open source 3D engine. What I'm not sure of is how best to approach the 'backlighting' effect of the individual squares of the feature board. A square can be individually turned on or off and dimmed to any level. I'm very experienced with C++ and assembly but fairly new to directx/opengl.
Bearing in mind there could be up to 512 lamps flashing/dimming individually, I'm guessing that using 'normal' lights behind semi-transparent textures would be too intensive? I've read up about pixel and vertex shaders, and was wondering if this would be the best way to approach the effect? (eg split the feature board up into individual textured polygons for each square, but join them all together so it looks as one)
Thanks for any advice
I have some experience with Blender such that I can make a semitransparent cylinder of specified dimensions and small spheres. I want to (for a chemistry tutorial video explaining temperature and heat concepts) write a program that will:
Set up the cylinder and some spheres in a coordinate space
Set up a camera and lighting
Get the spheres moving around in random directions while keeping track of their positions and making them bounce when necessary (this I can figure out given a coordinate space; and I'm not going to get bone-crunchingly accurate trying to do accelerations, taking "mass" into account, etc. just going to send balls in another direction at the "speed" all the balls are going)
Record what this would look like through the camera for a set amount of time (thinking command line option in seconds)
In other words, by #4, this program doesn't even need to be GUI at all. I just want the program to make a video.
It may take me a very long time to actualize this because though I have a lot of experience with C, C++, and Java, I don't know how to take a 3D model file and programmatically control it. I don't even know the infrastructure of libraries and accompanying API to control 3D objects and record the camera to a file.
Are there any tutorials that would go from starting with some 3D models to programmatically setting up a scene (objects, camera, lights), programmatically moving the objects in the coordinate space, and recording the video to a file?
Knowing some programming already, I want to point you to Unity, www.unity3d.com
Unity is a 3d game engine, though it can be used for a number of different things, including this program you have in mind.
It's programmed with C# or Javascript, and I think you could pick these languages up easily enough.
Basically what you described in your last paragraph is exactly what Unity does.