2014/10/15 下午 10:12:57

iphone Programming Glossary: projection

Drawing into OpenGL ES framebuffer and getting UIImage from it on iPhone

http://stackoverflow.com/questions/10936157/drawing-into-opengl-es-framebuffer-and-getting-uiimage-from-it-on-iphone

for OpenGL ES 1.1. The solution is to set constant to kEAGLRenderingAPIOpenGLES1 the second I did not set model and projection matricies if I use 1.1 glViewport 0 0 width height glMatrixMode GL_PROJECTION glLoadIdentity glOrthof 1.0f 1.0f 1.5f 1.5f..

OpenGL ES 2.0 texture distortion on large geometry GL_REPEAT

http://stackoverflow.com/questions/11370074/opengl-es-2-0-texture-distortion-on-large-geometry-gl-repeat

point precision but this didn't fix or lessen the texture distortion issue Scaling the modelview or scaling the projection matrix does not help Changing texture filtering options does not help Disabling mipmapping or using GL_NEAREST GL_LINEAR..

OpenGL ES (iPhone) Touch Picking

http://stackoverflow.com/questions/2231433/opengl-es-iphone-touch-picking

float top tan fov near float bottom top float left aspect bottom float right aspect top I'm a viewing volume symmetric projection matrix GLfloat P near right 0 0 0 0 near top 0 0 0 0 far near far near 2 far near far near 0 0 1 0 GLfloat Pminus1 1 P 0..

iPhone image stretching (skew)

http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew

as a 2D transform either. However the vector x y z w 1 will be converted to the actual 3D vector x w y w z w before projection if CA follows usual 3D compute graphics rules so you could cheat by using the transform P . . Q x x' . R . S y y' . . 1..

iPhone OpenGL ES - How to Pick

http://stackoverflow.com/questions/2540447/iphone-opengl-es-how-to-pick

Picking mode is not available in openGL ES. But it's easy to calculate the screen coordinate of any 3d point using the projection matrix retrieved from current openGL state. Here is how I do it IMPoint2D and IMPoint3D are basic x y and x y z structures..

How to display an image on a MKOverlayView?

http://stackoverflow.com/questions/3891850/how-to-display-an-image-on-a-mkoverlayview

an image on a MKOverlayView UPDATE Images who are projected on the MKMapView using a MKOverlayView use the Mercator projection while the image that I use as input data uses a WGS84 projection. Is there a way to convert the input image to the right.. the MKMapView using a MKOverlayView use the Mercator projection while the image that I use as input data uses a WGS84 projection. Is there a way to convert the input image to the right projection WGS84 Mercator without tiling the image up and can it.. the image that I use as input data uses a WGS84 projection. Is there a way to convert the input image to the right projection WGS84 Mercator without tiling the image up and can it done on the fly Normally you could convert a image to right projection..

Skybox OpenGL ES iPhone and iPad

http://stackoverflow.com/questions/4110893/skybox-opengl-es-iphone-and-ipad

know the CoreGraphics means for getting pixel data from a PNG how to set up the PROJECTION stack to get a perspective projection with the correct aspect ratio how to manipulate the MODELVIEW stack to ensure two axis rotation first person shooter or..

iPhone CoreLocation: How to get the most accurate speed

http://stackoverflow.com/questions/582511/iphone-corelocation-how-to-get-the-most-accurate-speed

is not available what will you display One approach is to let the phone deliver less accurate answers and using a projection of what was happening the last time you had best accuracy information see if what you have makes sense. That is suppose..

OpenGL Texture Coordinates in Pixel Space

http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space

In OpenGL ES, how do I convert screen coordinates to world coordinates?

http://stackoverflow.com/questions/611468/in-opengl-es-how-do-i-convert-screen-coordinates-to-world-coordinates

to render a texture. iphone opengl es share improve this question If you're doing a 2D game you can set up your projection and model view matrices so that you don't need to convert at all This goes in your init code somewhere Set up 480x320 orthographic.. matrices so that you don't need to convert at all This goes in your init code somewhere Set up 480x320 orthographic projection glMatrixMode GL_PROJECTION glLoadIdentity glOrthof 240.0f 240.0f 160.0f 160.0f 1.0f 1.0f Rotate into landscape mode glMatrixMode..

Use of VAO around VBO in Open ES iPhone app Causes EXC_BAD_ACCESS When Call to glDrawElements

http://stackoverflow.com/questions/6240863/use-of-vao-around-vbo-in-open-es-iphone-app-causes-exc-bad-access-when-call-to-g

0 4 program use glBindVertexArrayOES arrayObject glDisable GL_TEXTURE_2D glEnable GL_DEPTH_TEST CC3GLMatrix projection CC3GLMatrix matrix float h 4.0f self.frame.size.height self.frame.size.width projection populateFromFrustumLeft 2 andRight.. GL_DEPTH_TEST CC3GLMatrix projection CC3GLMatrix matrix float h 4.0f self.frame.size.height self.frame.size.width projection populateFromFrustumLeft 2 andRight 2 andBottom h 2 andTop h 2 andNear 4 andFar 10 glUniformMatrix4fv projectionUniform 1.. projection populateFromFrustumLeft 2 andRight 2 andBottom h 2 andTop h 2 andNear 4 andFar 10 glUniformMatrix4fv projectionUniform 1 0 projection.glMatrix CC3GLMatrix modelView CC3GLMatrix matrix modelView populateFromTranslation CC3VectorMake..

Help calculating X and Y from Latitude and Longitude in iPhone

http://stackoverflow.com/questions/6852195/help-calculating-x-and-y-from-latitude-and-longitude-in-iphone

the reference. But I am having no success at all... Using the law of cosines I can find the angle that will give my projections of X and Y but I can't find a scale to multiply correctly. I guess is because latitude and longitude are given in degrees.. in following pseudo code Compute vector 1 from the bottom right lat2 lon2 to the bottom left lat1 lon1 Using simple projection xl lon yl lat then vector 1 lon2 lon1 i lat2 lat1 j Compute vector 2 from the lat lon position of person you want latp lonp.. vector dot product to get the angle between vector 1 and 2. Compute the distance in lat lon space via equirectangular projection p1 lonp lon1 cos 0.5 latp lat1 convert lat lon to radians p2 latp lat1 distance R sqrt p1 p1 p2 p2 use R 6371000 and your..