graphics

问题 My code is working as it should but it might be a coincidence and I don't want to dwell on a bug later so I'm trying to keep it as clean as possible: I do the following for initializing a mesh: Gen and bind VBO and buffer data Gen and bind IBO and buffer data Gen and bind VAO Bind same VBO as before, generated in 1. Enable Vertex Attribute Arrays that I need and set the Vertex Attribute Pointers Bind the IBO again (don't exactly know why) BindVertexArray back to 0 so that I don't mess up the

问题 I have an implicit scalar field defined in 2D, for every point in 2D I can make it compute an exact scalar value but its a somewhat complex computation. I would like to draw an iso-line of that surface, say the line of the '0' value. The function itself is continuous but the '0' iso-line can have multiple continuous instances and it is not guaranteed that all of them are connected. Calculating the value for each pixel is not an option because that would take too much time - in the order of a

问题 I need to incorporate a 3D model of the Earth into a satellite orbit intercept simulation I have created in Mathematica (I need it to work with "Graphics3D[]). I have downloaded several different models in formats that Mathematica claims to support and I even created my own in Pro/E. The ones that actually do get imported into the program (using "Import[]") lose their surface image and I am left with a generic sphere. How can I get custom 3D graphics to import correctly into Mathematica? Are

问题 I have panel and various controls on it. I would like to save an image of this panel into a file, how can I do this ? Ineed to do something like screenshot, but I need just image of certain panel in my application and I want to do this on a button click in my app. Best regards, Primoz EDIT: I also draw on this panel using this code Graphics g = chartTemperature.CreateGraphics(); g.DrawLine(p, prevPoint, e.Location); prevPoint = e.Location; But then I don't get this into image. Why, and how to

问题 I'm making a small collection of types/functions related to gradients for future use. I would like to make sure there's at least two procedures: ColorBetween and ColorsBetween. I may want to just get an array of TColor between any 2 colors (ColorsBetween), and I may also just need to know one color value at a percentage between two colors (ColorBetween). I already have it mostly done below. Except, I have two core questions: How do I calculate the in-between color of each RGB channel by a

问题 I would like to increase the speed of plotting, and I am happy with (and have lots of code requiring) the R graphics and ggplot packages - so I am only interested in knowing how I can configure my system to speed up plotting. Specifically: Is the speed of plotting in R limited by the processor, memory, graphics card? Are there particular hardware components or configurations would increase plotting speed? Update: Answers to questions in comments: specs: Ubuntu 11.04, intel Core Duo, 8GB ram,

问题 I should have the newest version of Glew and Glut so that shouldn't be the problem. Everything should be linked, and I'm using MS visual studio 2010. My program compiles but when I get to glCreateShader(GL_FRAGMENT_SHADER) it show an error: "0xC0000005: Access violation." my program: #include <GL\glew.h> #include <GL\glut.h> #include <stdio.h> #include <stdlib.h> GLuint program; static char* readShaderSource(const char * shaderFile) { FILE* fp = fopen(shaderFile, "r"); char* buf; long size;

问题 Is there some way how to make custom points in R? I am familiar with pch argument where are many choices, but what if I need to plot for example tree silhouettes? For example if I draw some point as eps. (or similar) file, can I use it in R? . Solution by raster is not good in the case of complicated objects (f.e. trees). 回答1: You can do this with the grImport package. I drew a spiral in Inkscape and saved it as drawing.ps . Following the steps outlined in the grImport vignette, we trace the

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed last year . I'm trying to find an algorithm that will compute the intersection between 2 rectangles, which are not necessarily axis-aligned, and return the resulting intersection. This question describes finding whether an intersection exists. I'd like to have the resulting shape of the

问题 I have a system in place for a game yet I don't know what I should use to display it. I am making a vertical shooter game and I have written the methods for all the classes controlling enemies and players, but I have not idea how to efficiently display the game. I was thinking a Canvas, that would repaint every frame, but is that really the most efficient method? Important details: ideal framerate: 25fps It is a 2d game There are anywhere between 25-100 objects on the screen at any one time,