multisampling

I'm trying to enable mutlisampling and alpha-to-coverage for an FBO. Using the default framebuffer, all I have to do is call glEnable(GL_MULTISAMPLE) and glEnable(GL_SAMPLE_ALPHA_TO_COVERAGE) . However, I am unable to achieve the same effect using my own FBO. My goal: Draw the scene to an FBO the same way it would be drawn to the default framebuffer with the above properties. From there I want to be able to use the image as a texture for future passes through a shader. This works : Code for making an FBO without multisampling/alpha-to-coverage, 1 color attachment, 1 depth attachment: //

This question already has an answer here: How to split data into training/testing sets using sample function 23 answers Randomly sample data frame into 3 groups in R 4 answers I'd like to know how to make multiple sampling in R. For example, when I try dividing some data into 60(train data):40(validate data), I can write the code like this: original.data = read.csv("~.csv", na.strings="") train.index = sample(c(1:dim(original.data)[1]), dim(original.data)[1]*0.6) train.data = original.data[train.index,] valid.data = original.data[-train.index,] However, it is so hard to figure out making

What does setting this variable do? For instance, if I set it to 4, what does that mean? I read a description on glfw.org (see here: GLFW Window Guide ) under the "Framebuffer related hints" section. The manual says "GLFW_SAMPLES specifies the desired number of samples to use for multisampling. Zero disables multisampling. GLFW_DONT_CARE means the application has no preference." I also read a description of multisampling in general (see here: Multisampling by Shawn Hargreaves). I have a rough idea of what multisampling means: when resizing and redrawing an image, the number of points used to

How do I enable multisampling when I create the window? How should I initialize OpenGL to match? Took me a while to figure this one out. The trick is to use a QSurfaceFormat in your QWindow 's constructor like so: setSurfaceType(QWindow::OpenGLSurface); QSurfaceFormat format; format.setSamples(4); // Set the number of samples used for multisampling setFormat(format); // Note we set the format on the window... create(); // Create the window context = new QOpenGLContext(this); context->setFormat(format); // ...and set the format on the context too context->create(); And later, when initialising

I'm experimenting w/ improving the "resolution" of an OpenGL ES based app. Apple mentions here (developer.apple.com) that OpenGL ES in iOS 4 supports multisampling... and this can improve the graphics somewhat. How do you enable multisampling? The WWDC session 415 video goes over this a bit, so grab and watch that if you can. Essentially, you create a second framebuffer for msaa rendering using glRenderbufferStorageMultisampleAPPLE for its depth and color buffers. Then you bind this multisample framebuffer, render your scene, then do the multisampling resolve into your main framebuffer: