robertosfield
commented
2 years ago HI Rainer,
I don't have an explanation at this point, only suggestions on what to test next. Could you run the example with -d to enable the Vulkan debug laye to see if there are any errors.
It's curious that you are seeing the background colour on the Windows image, so some frame buffer image is being read, just not one that contains the final image, so perhaps there is a sync issue of some kind such that the screen capture code is running too early in the frame.
W.r.t the stbi_write_png, I think it would be useful to add this to vsgXchange.
The code you've added to do the stbi_write_png creates a local char array then copies the data across. I don't think this is required as you should be able to get the data directly from vsg::Data::dataPointer(), you'll just need to cast the void to char.
Also as a general note on vsg::Data usage, the begin()/end() iterator support enables C++17's for() shorthand, so the original code:
size_t k = 0;
for(size_t i=0; i<imageData->size(); i++) {
vsg::ubvec4 pix = imageData->at(i);
pixels[k++] = pix[0];
pixels[k++] = pix[1];
pixels[k++] = pix[2];
pixels[k++] = pix[3];
}Can be replaced by:
for(auto& pix : *imageData) {
pixels[k++] = pix[0];
pixels[k++] = pix[1];
pixels[k++] = pix[2];
pixels[k++] = pix[3];
}Cheers, Robert.
Message ID: @.***>
rainergericke
Hi Robert,
vsgscreenshot models/teapot.vsgt
shows the famous Melitta teapot as 3d scene. With the 's' key a 2d model of the actual view in the file 'screenshot.vsgt' can be written. Opening this file with:
vsgviewer screenshot.vsgt
shows only the background color on Windows. For our project we need the image export as basic functionality for video generation. This information is available in the variable 'imageData' and can easily be exported via stb_image_write. It works perfectly on my Mac M1 MacOS 12.3. On Windows (AMD Ryzen 9 with NVIDIA GeForce RTX 3050) only shows the background color.
For further tests I modified the vsgscreenshot example, it exports flat image files now. Can you repeat this error?
Best TestProblem.zip