rendering

问题 We have a StreamGeometry object which we would like to render in about 400 different locations during the OnRender call. The problem is, of course, that a geometry object uses absolute coordinates. While we could of course apply transforms before the render call, that means we'd in essence be creating 400 transforms as well, which just seems like overkill. We just want to say 'Render this in that location, like this (Note: DrawGeometryAtPoint is fictitious)... protected override void OnRender

问题 In XNA is there a way to render the contents of a spriteBatch after drawing to a texture object before rendering to the screen? 回答1: You'll need to switch your render target for the spritebatch and then grab the texture out of it. This MSDN article explains it pretty well. http://msdn.microsoft.com/en-us/library/bb976073.aspx 回答2: As Hexxagonal already answered, yes you can. But you might get into trouble, if you are using sprites with translucency. The reason is, that two overlapping sprites

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 4 months ago . i want to try writing a playground similar to this 4D toys, so i started learning opengl. from my current understanding, people use VBOs and uniform transformation matrix for mostly-static objects (like cubes, skeletal animations etc., which usually just involves transformations)

问题 In my rails 4 app I have comments for different models with polymorphic association. For the post model I display comments on the index page , but for product model I do it on the show page . I have problems with fine-tuning the rendering and caching on the post index page , since it's comments index in posts index . I provided my solutions both for the post version and product version. I don't use touch:true in comment model since it doesn't make sense on the product show page. Thanks to

问题 So we have a service running on Server 2008 which kicks off a process (C# app) which does some rendering. The process is running successfully but it is using the system fonts (Arial I believe) instead of fonts which are supposed to be loaded. If I run this process manually by logging into the server, the fonts load successfully and the process renders correctly. I have tried running this process by using CreateProcessWithLogonW but that still doesn't work. I am assuming this has to do with

问题 I'm in the middle of development of a website, however I cannot work out what is causing this plethora of issues. In Safari on OS X (7.0.6 on 10.9.4), random elements will disappear and reappear and hovering over the drop down menu, or a button, they suddenly re-appear. It is very strange and erratic. In Chrome (v36.0.1985.143) and Firefox (v31.0) the scrolling performance is poor, but no rendering issue. All onscroll events are clean. I've tried tweaking with just about everything and gotten

问题 I need an algorithm to render pixel perfect triangles without using OpenGL. Where can I get such an algorithm like OpenGL is using? Preferrably single threaded. It must do it like OpenGL does it, because OpenGL doesn't leave gaps or overlapped pixels on two triangles that share an edge. Scanline method makes those errors: http://joshbeam.com/articles/triangle_rasterization/ . I tried this half-space algo too: http://devmaster.net/forums/topic/1145-advanced-rasterization/ but I couldnt make it

问题 I am using opengl (fixed-function pipeline) and I'm drawing potentially hundreds of thousands of points, and labeling each with a text label. This question is about whether I'm doing this in a reasonable way, and what I can expect in terms of speed. The text labels are drawn by creating a texture coordinate rectangle for each character, and texturing the rectangles using a small font bitmap (each character is about 5x13 pixels in the texture). In a test file, I have about 158,000 points,

问题 I have started playing around with Geolocation, and I can get the co-ordinates etc. I want to show this in a map, but when I return the map to the div nothing gets displayed. Now I looked in the div, and the map is being returned but just not visibile. This is the div in question Notice this seems to be just a link to a tiny map <a style="position: static; overflow-x: visible; overflow-y: visible; float: none; display: inline; " target="_blank" href="http://maps.google.com/maps?ll=51.263519,

问题 I am using the default OpenGL values like glDepthRangef(0.0,1.0);, gldepthfunc(GL_LESS); and glClearDepthf(1.f); because my projection matrices change the right hand coordinate to the left hand coordinate. I mean, My near plane and the far plane z-values are supposed to be [-1 , 1] in NDC. The problem is when I draw two objects at the one FBO including same RBOs, for example, like this code below, glEnable(GL_DEPTH_TEST); glClearDepthf(1.f); glClearColor(0.0,0.0,0.0,0.0); glClear(GL_DEPTH