graphics

问题 I am learning directx. It provides a huge amount of freedom in how to do things, but presumably different stategies perform differently and it provides little guidance as to what well performing usage patterns might be. When using directx is it typical to have to swap in a bunch of new data multiple times on each render? The most obvious, and probably really inefficient, way to use it would be like this. Stragety 1 On every single render Load everything for model 0 (textures included) and

问题 How would I link in or compile SOIL (http://lonesock.net/soil.html) into my C++ OpenGL project on Mac OS X? 回答1: On newer versions of Mac OS X, such as Leopard, you'll have to edit the make file and add '-arch 1386 -arch x86_64' to the CXX macro of the Makefile. After compiling, you'll also have to link in the CoreFoundation.framework in your project. So your final build command might look something like gcc -Wall -lSOIL -framework OpenGL -framework GLUT -framework CoreFoundation 回答2: There's

问题 I've seen the occasional article suggest ordering your vertices from nearest to furthest from the camera when sending them to OpenGL (for any of the OpenGL variants). The reason suggested by this is that OpenGL will not fully process/render a vertex if it is behind another vertex already rendered. Since ordering vertices by depth is a costly component of any project, as typically this ordering frequently changes, how common or necessary is such design? I had previously thought that OpenGL

问题 I have following data ct<-structure(list(Conc = c(50L, 100L, 150L, 50L, 100L, 150L, 50L, 100L, 150L, 100L, 100L, 100L), kGy = c(10L, 10L, 10L, 15L, 15L, 15L, 20L, 20L, 20L, 15L, 15L, 15L), CT.Y. = c(75L, 65L, 51L, 87L, 93L, 89L, 81L, 86L, 78L, 92L, 93L, 92L)), .Names = c("Conc", "kGy", "CT.Y."), class = "data.frame", row.names = c(NA, -12L)) And i am using following R code for response surface library(rsm) ct.rsm<-rsm(CT.Y.~SO(Conc, kGy), data=ct) persp(ct.rsm, Conc ~ kGy, col=rainbow(50),

问题 As part of a project I am working on, I need to simply analyze a picture using a CLI Linux application and determining if its dark image (high contrast, low brightness). So far, I figured out I can use ImageMagick to get verbose information of the image, but not sure how to use that data...or is there a simpler solution? 回答1: You could scale the image to a very small one -- one that has a dimension of 1x1 pixels and represents the "average color" of your original image: convert original.jpeg

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . Given two lists, which contain same elements of string but in different orders, is there any API that can draw diagrams like The diagram consists of two stacks of string. Between these two stacks, lines are used to link same elements between these two stacks. Its outlook is similar as the visualization of sonar

问题 I want to begin developing 2D Java games for phones (on J2ME) therefore I'd like to know if any libraries or "engines" exist to help out in the various graphical tasks: Drawing text with pixel fonts? Drawing bitmaps for sprites with multiple frames like animated GIFs? Drawing graphics with code, lines, beziers, flood-filling and gradient fills? Ordering / layering of sprites? Or maybe a great book exists, that gives you enough code samples to get off the ground quickly? 回答1: I didn't use it

问题 I am trying to implement a Microfacet BRDF shading model (similar to the Cook-Torrance model) and I am having some trouble with the Beckmann Distribution defined in this paper: https://www.cs.cornell.edu/~srm/publications/EGSR07-btdf.pdf Where M is a microfacet normal, N is the macrofacet normal and ab is a "hardness" parameter between [0, 1]. My issue is that this distribution often returns obscenely large values, especially when ab is very small. For instance, the Beckmann distribution is

问题 For example we have two rectangles and they overlap. I want to get the exact range of the union of them. What is a good way to compute this? These are the two overlapping rectangles. Suppose the cords of vertices are all known: How can I compute the cords of the vertices of their union polygon? And what if I have more than two rectangles? 回答1: There exists a Line Sweep Algorithm to calculate area of union of n rectangles. Refer the link for details of the algorithm. As said in article, there

问题 I am hoping the saveLayer methods will allow me to do draw onto different "layers" and then once the drawing has finished, merge the layers with the canvas in whichever order i choose. The obvious question is "why dont you just rearrange your drawing operations instead?" The answer is I can't: I have a Path that I need to draw onto a Canvas. In the background/lowest z-index I want to draw the path closed and with a few additional points using a fill style. Then on top of that, I want to draw