multisampling

问题 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? 回答1: 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

问题 I currently have a data frame called liquidation where I want to run 30 random samples of 1000 observations each from it, designate which account came from which sample and then combine it into a new data frame with all 30 samples combined: Here is how I did it manually while using the dplyr package for random sampling but want to simplify it for repeatability: Sample_1 <- liquidation %>% sample_n(1000) Sample_1$Obs <- 1 Sample_2 <- liquidation %>% sample_n(1000) Sample_2$Obs <- 2 Sample_3 <-

问题 I'm trying to do multisampling with SDL/opengl but SDL won't accept setting SDL_MULTISAMPLEBUFFERS and SDL_MULTISAMPLESAMPLES. Instead these are left at 0 and SDL_SetVideoMode() will fail afterwards. I know my hardware can do this pixel format with 4x multisampling. I'm running Ubuntu 10.10. Code: SDL_Init( SDL_INIT_VIDEO ); SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE

问题 This question already has answers 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) Closed 8 months ago . 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)

问题 This question already has answers 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) Closed 8 months ago . 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)

问题 I would like to enable multisampling when drawing triangles like on the following picture: I found a way to do with SlimDX in another question but it doesn't work in exclusive mode. Here is my code: void Form1_Load(object sender, EventArgs e) { Direct3D d3d = new Direct3D(); PresentParameters presentParams; presentParams.Windowed = false; presentParams.BackBufferFormat = Format.X8R8G8B8; presentParams.BackBufferWidth = 800; presentParams.BackBufferHeight = 600; presentParams

问题 I would like to enable multisampling when drawing triangles like on the following picture: I found a way to do with SlimDX in another question but it doesn't work in exclusive mode. Here is my code: void Form1_Load(object sender, EventArgs e) { Direct3D d3d = new Direct3D(); PresentParameters presentParams; presentParams.Windowed = false; presentParams.BackBufferFormat = Format.X8R8G8B8; presentParams.BackBufferWidth = 800; presentParams.BackBufferHeight = 600; presentParams

问题 I am using MacBook Pro (13-inch, Mid 2010) and I work with OpenGL. I noticed, some of functions miss in library. I found specifications on the internet about my hardware and it says: " support OpenGL 3.3 ". It was strange so I printed my OpenGL version and IT IS 2.1, NO 3.3! . (Then I found, newest MacBooks (2014) have the same OpenGL version 2.1, WTF) Then I almost jumped from window. (JK) I googled something about 2.1 with some extension ARB , but there is no documentation, no usage, nobody

问题 Multisampling is a way of applying full screen anti-aliasing (FSAA) in 3D applications. I need to use multisampling in my OpenGL program, which is currently embedded in a wxWidgets GUI. Is there a way to do this? Please respond only if you know the detailed steps to achieve this. I'm aware of enabling multisampling using WGL (Win32 extensions to OpenGL). However, since my OpenGL program isn't written in MFC (and I want the code to be multi-platform portable), that's not an option for me. 回答1:

问题 I'm trying to render a multisampled scene to texture, here is the code I'm using. I'm getting a black screen. I check the fbo completeness at the end of init, and they report that both fbo's are complete. void init_rendered_FBO() { glGenFramebuffers(1,&fbo); glBindFramebuffer(GL_FRAMEBUFFER, fbo); glGenTextures(1,&fbo_tex); glBindTexture(GL_TEXTURE_2D, fbo_tex); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO