Search DaniWeb - projection

Pushing projection below a selection 15 Years Ago by humor_me …when we push projections, it is quite usual for the projection to also remain where it is. Can there be situations… where when we push projections, we need not retain the projection at the same place and yet obtain an equivalent logical…q,r and we have the following logical query plan : Projection(p,q) (Selection(q=3)(A)) Would Selection(q=3… Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by mike_2000_17 …modelview transformation(s). However, at the last step (projection), they use the fourth component in this special … to compute those normalized screen coordinates. And the projection matrix only deals with vertices anyways (no vectors),…by OpenGL internally, after the projection matrix has been applied. So, you projection matrix should be good to … Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by Mr.UNOwen … down the bugs/ things I don't understand to the projection matrix. Here's what I'm getting: Looking from the…; let me know if any of it is wrong: P = projection matrix M = model view matrix Vm = vertex in "world… Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by uonsin ….scratchapixel.com/lessons/3d-advanced-lessons/perspective-and-orthographic-projection-matrix/perspective-projection-matrix/ you should get familiar with how to do… Selection and Projection Operators 15 Years Ago by MrJNV So I have this assignment in which I need to use Selection and Projection operators on n-ary relations. The book really doesn't cover it in a way I understand and doesn't explain it in terms of c++, so could someone help me out. Could someone give me a "c++ code explanation" on what these are? Thanks. Re: Selection and Projection Operators 15 Years Ago by Fbody Not real sure what a "Projection" operator is, but your "Selection" operators are … What is the depth after a vertex goes through view and projection matrix 10 Years Ago by Mr.UNOwen … it's original value (a seperate issue). Given a perspective projection at 45 degrees with a near of 1 and a… Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by mike_2000_17 … your matrices correctly with regard to getting a correct modelview + projection transformation, the transformation back and forth should always work if… Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by Mr.UNOwen … the identity back. So it's all pointing to the projection function, but nothing is standing out. Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by mike_2000_17 … be between 0 and 1 (if within the frustum)? The projection matrix takes the vector to the so-called "clip… Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by Mr.UNOwen … just be able to feed this into opengl as the projection matrix (since this is gluperspective(...))? Re: Selection and Projection Operators 15 Years Ago by Ancient Dragon Never heard of them either. But after reading [URL="http://cisnet.baruch.cuny.edu/holowczak/classes/3400/relationalalgebra/#selectionexamples"]this[/URL] I tink its nothing more than the WHERE clause in SQL statements. [icode]SELECT Name,Office,Dep,Rank FROM mytable WHERE dep = 'CS';[/icode] That is an SQL example select … Re: Selection and Projection Operators 15 Years Ago by MrJNV Ah. Now I sorta see what needs to be done. I never realized I needed an sqlapi library for this, and those WHERE clauses help. Thanks! Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by Mr.UNOwen So fov is in radians and the reason data[_AP_MCC] and data[_AP_MDC] are not multiplied by -1 is because diffz is swapped.Thanks for the link, it may point to the flaw. Please let me know if anything else stands out. Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by Mr.UNOwen So it looks like getting the inverse of the perspective works, but now I'm having trouble with the Orthographic view, which is weird as it's almost a scalar matrix (assuming left,righ top,bottom are equal in magnitude). So I keep getting about +/-0.4.. on the edges no matter what I set, even if it's (-100, 100) or (-1,1). Any clue what I'm missing… Re: What is the depth after a vertex goes through view and projection matrix 10 Years Ago by Jean_4 Gosh, read the links that were sent to you. It's all explained in there... Android Native - How to load Album Art thumbnails 3 Years Ago by dimitrilc … not needed var thumbnail: Bitmap? = null applicationContext.contentResolver.query( collection, projection, selection, selectionArgs, sortOrder )?.use { cursor -> val idColIndex = cursor.getColumnIndex… Brand New Panasonic TH-50PHD8UK 50 in Flat Panel Plasma TV 17 Years Ago by ushtv …TV $400 Samsung HL-R5067W 50 in Rear-Projection DLP TV $450 Samsung LN-R268W 26 in…TV $300 Samsung HL-R4667W 46 in Rear-Projection DLP TV $400 Samsung LN-R268W 26 in… Sony Grand WEGA KDFE42A10 42 in LCD Rear-Projection TV $400 Sony Grand WEGA SXRD KDS-R60XBR1… Grand WEGA KDF-E55A20 55 in LCD Rear-Projection TV $550 Sony Wega KLV-S32A10 32 in… Problem with constructors and operator overloading for 3D homogeneous coordinates 15 Years Ago by bobsta …mark/Vega_lib/Source/Geom.h: In member function ‘Vector fourMatrix::projection(Vector&, fourVector&)’: /home/mark/Vega_lib/Source/Geom.…mark/Vega_lib/Source/Geom.h: In member function ‘Vector fourMatrix::projection(Vector&, Vector&, int)’: /home/mark/Vega_lib/Source… Show lat and long in text box 11 Years Ago by firedesire …?e?ia ia?eaoi?iaa i?iaeoey iiecaaia io Google {projection:"EPSG:900913"}*/ var map = new OpenLayers.Map('map…', {projection:"EPSG:900913"}, {controls:[ new OpenLayers.Control.PanZoom(), new … Android Native - Query Audio Files from MediaStore 3 Years Ago by dimitrilc … MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, projection, selection, selectionArgs, sortOrder … MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, projection, selection, selectionArgs, sortOrder … CSS Not Rendering in Live Mode 12 Years Ago by sj2222 …quot;/design/css/site.css" media="screen, projection" /> <![endif]--> <link…design/css/practice-products.css" media="screen, projection" /> <![endif]--> <…lt;/script> <link media="screen, projection" href="includes/video/html5/css/findlaw-… image gallery 13 Years Ago by davy_yg …quot;css/sliderkit-core.css" media="screen, projection" /> <link rel="stylesheet&…quot;css/sliderkit-demos.css" media="screen, projection" /> <link rel="stylesheet&…quot;gallery/css/sliderkit-demos.css" media="screen, projection" /> <link rel="stylesheet"… DirectX 11 coordinate system question 12 Years Ago by tomtetlaw … left of the screen? I've setup an orthographic projection matrix, so that I can use screen coordinates but …since I come from working with OpenGl. I setup my projection matrix like this: ww = the width of the window …and wh = the height of the window projection = XMMatrixIdentity (); projection = XMMatrixOrthographicLH (ww, wh, -1, 1); Re: OpenGL - Transformation matrix 16 Years Ago by MattEvans …in this case, or much better, use the projection matrix aswell. The projection matrix is automatically multiplied onto the modelview matrix …(0, 0, windowX, windowY); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // SETUP ORTHOGRAPHIC PROJECTION glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0.0, windowX, 0.0, windowY… Problem with reading in data from file 16 Years Ago by trelek2 …(line.substring(27)).doubleValue(); } if (line.startsWith("Angle of projection")){ ballVangle = Double.valueOf(line.substring(20)).doubleValue(); } // calculating the… Initial y position 48 Initial velocity magnitude 30 Angle of projection 0 Radius 13 Colour 3 Friction coefficient 0.2 Initial… OpenGL/SDL 15 Years Ago by deorcar … is to setup an Ortho graphic projection. An ortho graphic projection has no perspective //It setups the projection so its Width and height… Need help in a java code 14 Years Ago by Me12 …} void drawWireframe( Graphics g ) { // compute coefficients for the projection double theta = Math.PI * azimuth / 180.0; double phi…int z0 = vertices[j].z; // compute an orthographic projection float x1 = cosT*x0 + sinT*z0; float y1…cosTsinP*z0; // now adjust things to get a perspective projection float z1 = cosTcosP*z0 - sinTcosP*x0 - sinP*y0… Illegal Start of Expression 13 Years Ago by rezial …addKeyListener( this ); } void drawWireframe( Graphics g ) { // compute coefficients for the projection double theta = Math.PI * azimuth / 180.0; double phi = Math…j].y; int z0 = vertices[j].z; // compute an orthographic projection float x1 = cosT*x0 + sinT*z0; float y1 = -… Help 13 Years Ago by rezial …addKeyListener( this ); } void drawWireframe( Graphics g ) { // compute coefficients for the projection double theta = Math.PI * azimuth / 180.0; double phi = Math…j].y; int z0 = vertices[j].z; // compute an orthographic projection float x1 = cosT*x0 + sinT*z0; float y1 = -…