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The reconstructed 3D mesh is now mapped correctly with the real world.
The perspective distortion which need to be done before placing the rendered content to the mirror, is implemented several times… I tried using existing distortion classes on the web but they are made for distorting a plane into 3D perspective but not for my case that I need to undistort the 3D plane to a flat rectangle, the classes produce wrong result. I also tried using texture mapping in Sandy3D, but again it is slow and buggy when I need to move the camera a lot (for anaglyph).
In the end I implement my own unwrapping code. The main different is my code is designed to work on rectangle while the previous mentioned ones are based on triangles. The first version of my unwrapping code is written in pure haXe but it is very slow(framerate drops to ~0.5fps). And then I port the code to PixelBender, which use multi-threading, it is much smoother(several times better, but I’ve not checked).
Anaglyph(red-cyan glasses) is also done now. Since it need rendering for two times per frame, and then combine the two rendering, performance is again an issue. I tried to coded for the procedure: render for one eye -> unwrap and store it -> render for another eye -> unwrap and store it -> color transform and combine the two. But the framerate is dropped to ~1fps. So I put all the unwrap/color transform and combine to a single PixelBender kernel. So previously the kernel unwrap a single image for a time, now is takes two image and do unwrapping for both of them and color transform and add the results together. It reduced the data transmission between Flash and PixelBender and it also utilized multi-core for the “color transform and combine” process. It is now able to run in ~4-5fps. Although it is still slow but I have to move on to the next step.
Below is a video of the current result:
BTW, I go back to target Flash again since currently the C++ target do not support drawing Spite on BitmapData. This feature will be available in the next release of nme. So the performance problem can again be solved later if I switch it to C++ again.
The positions of the tracked IR LEDs which represent the head position can be streamed to the haXe rendering program via TCP socket. The position data is paired with the reconstructed 3D mesh.
The virtual cameras now can be controlled by the IR LEDs and creating a sense of 3D by moving the LEDs relative to the mirror. Some more camera facing problem need to be solve and the output image needs to be distorted according to the head position. The distortion code has already been created but not yet integrated to the haXe program.
However, my old projector is suddenly out of order, seems that the lamp inside need to be replaced. Because of this, I cannot test the result with the whole set up at this moment. I will borrow a projector tmr and post some result if it is ok.
