I am working on a project about exporting Adobe After Effect animation data to threejs.
When I try to get camera parameters, I can get the coordinate of the 'target point' from the camera directly, but if I rotate the camera, the 'target point' keep moving but the parameters not change.
How to get the real position of a camera's target point via expression or scripting？
If there are no direct way to access the data, How to calculate it with the rotation parameters?
sorry I cannot post image directly now, you can take a look at
this link
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I feel like I have been stuck perpetually with this problem. I have a single geoTIF file of weather radar data that will not overlay on Mapbox correctly. The spatial area is of the entire US. It should be a simple task, but there seems to be some sort of weird distortion causing the overlay to not be correct, even though I am very certain my Mapbox coordinates in the linked HTML file below are correct and match the geoTIF.
I uploaded the geoTIF to a website called "geotiff.io" (which uses leaflet to show the files) and it renders the image perfectly, but I cannot emulate it using Mapbox. The storms always are off in Mapbox.
This is a link to my Mapbox map with the image overlay where it is incorrect
This is a dropbox link to a zip file with the geoTIF and colorization file, which I used gdaldem with
I would like to explain more, so it's simplified. Here is an image showing part of a storm that is out of place (left side) and how it is too far north. On the right side was a screenshot taken from geotiff.io - and how it's perfect. What is going on here?!
The geoTIF image was not set as a web mercator projection before being displayed in Mapbox. I assume the geotiff.io service corrected this automatically and made me think there was an issue with the code or Mapbox, when it was not.
I have very little experience programming with graphics objects. I am currently tasked with exporting a document (.tiff image) with redacted annotations. The redacted annotation is just a black rectangle object. I am able to get the x coordinates, y coordinates, width and height properties through the .XMP data. There is also a property called rotatation. This is where I am getting stuck, applying the rotation.
So, imagine a document with a redaction on it blacking out the first paragraph. Then, using a tool in the editor the user rotates the document so that it is now laying on it's side. The client is able to render the redaction correctly because we are using the Atalasoft controls to get and display annotations. Now we have a web service that will go and retrieve that image with redactions. We are not able to use the Atalasoft controls in this service due to licensing issues so we just extract the .XMP data from the .tiff image and manually draw the redactions. The problem is, if the user rotates the document when the redaction is already on the document I am having a hard time getting the redaction to rotate correctly (due to my lack of knowledge on graphics programming). If I do not apply any rotation, the redaction is displayed where it was BEFORE the document had been rotated, thus redacting the wrong area of the document.
Here is what I have tried:
Dim rectangle As New Rectangle(xCoordinate, yCoordinate, width, height)
graphics.RotateTransform(rotation)
graphics.FillRectangle(Brushes.Black, rectangle)
When I do this, the redaction does not show up at all on the final document. I have read that I may need to call the following before applying the rotation:
graphics.TranslateTransform(x,y)
But I have no idea what I should be passing in as x and y. It seems like I just need to get the rotation to apply from the upper left corner of the rectangle, but I have yet to figure out a way to properly do this.
Thank you so much for any help or pushes in the right direction!
EDIT 1:
I have also tried this (taken from How can I rotate an RectangleF at a specific degree using Graphics object?).
Dim rectangle As New Rectangle(xCoordinate, yCoordinate, width, height)
Using rotationMatrix As New Matrix
rotationMatrix.RotateAt(rotation, New PointF(rectangle.Left + (rectangle.Width / 2), rectangle.Top + (rectangle.Height / 2)))
graphics.Transform = rotationMatrix
graphics.FillRectangle(Brushes.Black, rectangle)
graphics.ResetTransform()
End Using
Which does rotate the rectangle, but it ends up in the wrong spot so it is not redacting the correct portion of the document. Once again, when I display the document without any rotation transform, it looks like the redaction simply needs to be rotated using the upper left corner as an axis but I'm not quite sure how to accomplish that.
Figured it out. Here is how I am rotating a rectangle using the upper left-hand corner as the axis:
Dim rectangle As New Rectangle(xCoordinate, yCoordinate, width, height)
Using rotationMatrix As New Matrix
rotationMatrix.RotateAt(rotation, New PointF(rectangle.Left, rectangle.Top))
graphics.Transform = rotationMatrix
graphics.FillRectangle(Brushes.Black, rectangle)
graphics.ResetTransform()
End Using
I want to render a scene interactively. The controls are already provided so that you can position the camera with mouse but you never know the exact value.
I want to manipulate the internal camera values as well e.g focal length.
Externally I want to set the translation and rotation of the camera.
I want to give all the values manually. Could anyone please help to point to such a demo or a code snippet to do it. Preferably in python.
Thanks a lot.
You can get the camera from the renderer with renderer->GetActiveCamera(). Then you can manipulate it using the class functions: http://www.vtk.org/doc/nightly/html/classvtkCamera.html
Here is a simple Python example: http://www.vtk.org/Wiki/VTK/Examples/Python/Camera
I need some help on an issue that I am having overlaying images on a live feed.
Currently, I am streaming raw data from a device, transcoding that data (i.e. ogg) and then re-streaming using HTTP because I need to view through an HTML page. My problem is that I need to overlay an image on the stream where - when a particular object moves - the image overlay moves as well.
For example, if you wanted to place an 'X' over a moving object where that object may move left-to-right or top-to-bottom. At this point, I am able to overlay the image at a fixed point using the following command:
ffmpeg -i rtsp://[host]:[port] -i x.png -filter_complex 'overlay=10:main_h-overlay_h-10' http://[host]:[post]/output.ogg
This will give me an 'X' over the object at the start but, once the object moves I need to change the position of that 'X'.
The only real requirement is that the technologies that I utilize need to be available for Linux.
Any ideas ?
Thanks !
I am trying to get DirectX (DX9) to grab a screenshot of the desktop and immediately draw it back out (in smaller dimensions) to my form.
I have DirectX working to the capacity that the device is created along with a few surfaces and I can render them to screen. I am using one surface F3F3Surf9_SS to get the desktop Screenshot.
Here is my declaration and initialization of varaibles
F3D3Surf9_SS : IDirect3DSurface9; //Surface SS
F3D3Surf9_A : IDirect3DSurface9; //Surface A
F3D3Surf9_B : IDirect3DSurface9; //Surface B
...
FDirect3D9.CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,Form1.Handle,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,#D3DPresentParams,
FDirect3DDevice9);
FDirect3DDevice9.CreateOffscreenPlainSurface(1360,768,D3DFMT_X8R8G8B8,
D3DPOOL_DEFAULT,F3D3Surf9_A,nil);
D3DXLoadSurfaceFromFile(F3D3Surf9_A,nil,nil,'D:\Images\Pillar.bmp',nil,
D3DX_DEFAULT,0,nil);
FDirect3DDevice9.CreateOffscreenPlainSurface(1360,768,D3DFMT_X8R8G8B8,
D3DPOOL_DEFAULT,F3D3Surf9_B,nil);
D3DXLoadSurfaceFromFile(F3D3Surf9_B,nil,nil,'D:\Images\Niagra.bmp',nil,
D3DX_DEFAULT,0,nil);
FDirect3DDevice9.CreateOffscreenPlainSurface(Screen.Width,Screen.Height,D3DFMT_A8R8G8B8,
D3DPOOL_SCRATCH,F3D3Surf9_SS,nil);
Here is the code I use to grab and then render the screenshot
FDIrect3DDevice9.BeginScene;
FDirect3DDevice9.Clear(0,0,D3DCLEAR_TARGET,D3DCOLOR_XRGB(0,0,255),0,0);
FDirect3DDevice9.GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO, BackBuffer);
FDirect3DDevice9.GetFrontBufferData(0,F3D3Surf9_SS); //Get the screen shot
FDirect3DDevice9.StretchRect(F3D3Surf9_SS,nil,BackBuffer,nil,D3DTEXF_NONE); //Draw it
FDIrect3DDevice9.EndScene;
FDirect3DDevice9.Present(nil,nil,0,nil);
However this does not work.
The image does not get drawn to screen. If I draw surface A or B to screen, that works but it doesn't work for Surface SS. However I know Surface SS has the screenshot in it since if I call D3DXSaveSurfaceToFile the resulting bitmap I put on the hard disk is a valid screen shot.
Any thoughts on the proper way to do this?
The reason this would not work is that the F3D3Surf9_SS was declared in system memory by D3DPOOL_SCRATCH and cannot be drawn directly to the back buffer as I was trying to.
So my solution was to use the F3D3Surf9_A surface and use UpdateSurface to copy the screenshot in system memory into the surface A in video memory.
The only other change I had to make to get this to work was create Surface A in the same format as the screenshot surface: D3DFMT_A8R8G8B8. Also had to make sure the the destination surface in UpdateSurface was larger than the source surface.
NOTE:
This is slow since we are reading from video memory to system memory and then right back to video memory.
I needed this for my application since I want to capture everything the OS and other application put on screen but if you are just worried about your own application then there are better alternatives.
If you know of a way to GetFrontBufferData without putting it to system memory (which is the only way I could see it working) please let me know.